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First-principles study of defect control in thin-film solar cell materials Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2021-01-15 Hui-Xiong Deng, RuYue Cao, Su-Huai Wei
A solar cell is a photovoltaic device that converts solar radiation energy to electrical energy, which plays a leading role in alleviating global energy shortages and decreasing air pollution levels typical of conventional fossil fuels. To render solar cells more efficient, high visible-light absorption rates and excellent carrier transport properties are required to generate high carrier levels and
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Grain boundary segregation and relaxation in nano-grained polycrystalline alloys Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-30 Tong-Yi Zhang, Ying-Xin Gao, Sheng Sun
The present study carries out systematic thermodynamics analysis of Grain Boundary (GB) segregation and relaxation in Nano-Grained (NG) polycrystalline alloys. GB segregation and relaxation is an internal process towards thermodynamic equilibrium, which occurs naturally in NG alloys without any applied loads, causes deformation and generates internal stresses. The analysis comprehensively investigates
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Current-driven transformations of a skyrmion tube and a bobber in stepped nanostructures of chiral magnets Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-30 Jin Zhu, YaoDong Wu, QiYang Hu, LingYao Kong, Jin Tang, MingLiang Tian, HaiFeng Du
Magnetic skyrmion tubes and bobbers are two types of different nanoscale spin configurations that can coexist in nanostructures of chiral magnets. They are then proposed to be utilized as binary bits to build racetrack memory devices. The ability to manipulate the two magnetic objects controllably by current in nanostructures is the prerequisite to realize the device. Here, we demonstrate by numerical
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Quantum speedup in adaptive boosting of binary classification Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-30 XiMing Wang, YueChi Ma, Min-Hsiu Hsieh, Man-Hong Yung
In classical machine learning, a set of weak classifiers can be adaptively combined for improving the overall performance, a technique called adaptive boosting (or AdaBoost). However, constructing a combined classifier for a large data set is typically resource consuming. Here we propose a quantum extension of AdaBoost, demonstrating a quantum algorithm that can output the optimal strong classifier
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Field-tuned magnetic structure and phase diagram of the honeycomb magnet YbCl 3 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-31 YiQing Hao, HongLiang Wo, YiMeng Gu, XiaoWen Zhang, YiQing Gu, ShiYi Zheng, Yang Zhao, GuangYong Xu, Jeffrey W. Lynn, Kenji Nakajima, Naoki Murai, WenBin Wang, Jun Zhao
We report thermodynamic and neutron diffraction measurements on the magnetic ordering properties of the honeycomb lattice magnet YbCl3. We find YbCl3 exhibits a Néel type long-range magnetic order at the wavevector (0, 0, 0) below TN = 600 mK. This magnetic order is associated with a small sharp peak in heat capacity and most magnetic entropy release occurs above the magnetic ordering temperature.
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The meridional circulation of the Sun: Observations, theory and connections with the solar dynamo Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-30 Arnab Rai Choudhuri
The meridional circulation of the Sun, which is observed to be poleward at the surface, should have a return flow at some depth. Since large-scale flows like the differential rotation and the meridional circulation are driven by turbulent stresses in the convection zone, these flows are expected to remain confined within this zone. Current observational (based on helioseismology) and theoretical (based
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Metamagnetic transitions and anomalous magnetoresistance in EuAg 4 As 2 crystals Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-29 QinQing Zhu, Liang Li, ZhiHua Yang, ZheFeng Lou, JianHua Du, JinHu Yang, Bin Chen, HangDong Wang, MingHu Fang
In this work, we systematically studied the magnetic and transport properties of EuAg4As2 single crystals. It was found that the two antiferromagnetic transitions (TN1 = 10 K and TN2=15 K) were driven to lower temperatures by an applied magnetic field. Below TN1, two successive metamagnetic transitions were observed when a magnetic field was applied in the ab plane (H//ab-plane). For both H//ab and
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Acoustic topological adiabatic passage via a level crossing Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-25 Ya-Xi Shen, Long-Sheng Zeng, Zhi-Guo Geng, De-Gang Zhao, Yu-Gui Peng, Jie Zhu, Xue-Feng Zhu
Stimulated adiabatic passage has been extensively studied to achieve robust and selective population transfer in quantum systems. Recently, the quantum-classic analogy has been rapidly developing and can be considered responsible for the implementation of the adiabatic transfer of sound energy in cavity chain systems. In this article, we investigate the adiabatic transfer of sound energy between two
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Intricate evolutions of multiple-period post-buckling patterns in bilayers Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-03 Zhe Cheng, Fan Xu
Surface instability of compliant film/substrate bilayers has raised considerable interests due to its broad applications such as wrinkle-driven surface renewal and antifouling, shape-morphing for camouflaging skins, and micro/nano-scale surface patterning control. However, it is still a challenge to precisely predict and continuously trace secondary bifurcation transitions in the nonlinear post-buckling
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One family of 13315 stable periodic orbits of non-hierarchical unequal-mass triple systems Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-03 XiaoMing Li, XiaoChen Li, ShiJun Liao
The three-body problem can be traced back to Newton in 1687, but it is still an open question today. Note that only a few periodic orbits of three-body systems were found in 300 years after Newton mentioned this famous problem. Although triple systems are common in astronomy, practically all observed periodic triple systems are hierarchical (similar to the Sun, Earth and Moon). It has traditionally
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Higher derivative scalar-tensor monomials and their classification Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-11-24 Xian Gao
We make a full classification of scalar monomials built of the Riemann curvature tensor up to the quadratic order and of the covariant derivatives of the scalar field up to the third order. From the point of view of the effective field theory, the third or even higher order covariant derivatives of the scalar field are of the same importance as the higher curvature terms, and thus should be taken into
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Electrically pumped terahertz laser based on a topological insulator quantum dot array Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-11-23 YongWei Huang, LiKun Shi, Jun Li, WenKai Lou, HuiHong Yuan, Wen Yang, Kai Chang
The energy level separation between the edge states in topological insulator quantum dots lies in the terahertz (THz) range. Quantum confinement ensures the nonuniformity of the energy level separation near the Dirac point. Based on these features, we propose that a topological insulator quantum dot array can be operated as an electrically pumped continuous-wave THz laser. The proposed device can operate
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Contrasting physical properties of the trilayer nickelates Nd 4 Ni 3 O 10 and Nd 4 Ni 3 O 8 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-02 Qing Li, ChengPing He, XiYu Zhu, Jin Si, XinWei Fan, Hai-Hu Wen
We report the crystal structures and physical properties of trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8. Measurements of magnetization and electrical resistivity display contrasting behaviors in the two compounds. Nd4Ni3O10 shows a paramagnetic metallic behavior with a metal-to-metal phase transition (T*) at about 162 K, as revealed by both magnetic susceptibility and resistivity. Further magnetoresistance
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Microdisk lasers on an erbium-doped lithium-niobite chip Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-12-02 Qiang Luo, ZhenZhong Hao, Chen Yang, Ru Zhang, DaHuai Zheng, ShiGuo Liu, HongDe Liu, Fang Bo, YongFa Kong, GuoQuan Zhang, JingJun Xu
Lithium niobate on insulator (LNOI) provides a platform for the fundamental physics investigations and practical applications of integrated photonics. However, as an indispensable building block of integrated photonics, lasers are in short supply. In this paper, erbium-doped LNOI laser in the 1550-nm band was demonstrated in microdisk cavities with high quality factors fabricated in batches by UV exposure
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A refined trans-Planckian censorship conjecture Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-11-26 Rong-Gen Cai, Shao-Jiang Wang
We propose a refined version of trans-Planckian censorship conjecture (TCC), which could be elaborated from the strong scalar weak gravity conjecture combined with some entropy bounds. In particular, no fine-tuning on the inflation model-building is required in the refined TCC, and it automatically passes the tests from those stringy examples that support the original TCC. Furthermore, our refined
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On-chip erbium-doped lithium niobate microcavity laser Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-30 YiAn Liu, XiongShuo Yan, JiangWei Wu, Bing Zhu, YuPing Chen, XianFeng Chen
The commercialization of lithium niobate on insulator (LNOI) wafer has resulted in significant on-chip photonic integration application owing to its remarkable photonic, acousto-optic, electro-optic, and piezoelectric nature. In recent years, a variety of high-performance on-chip LNOI-based photonic devices have been realized. In this study, we developed a 1-mol% erbium-doped lithium niobate crystal
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Probing new physics in dimension-8 neutral gauge couplings at e + e − colliders Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-30 John Ellis, Hong-Jian He, Rui-Qing Xiao
Neutral triple gauge couplings (nTGCs) are absent in the standard model effective theory up to dimension-6 operators, but could arise from dimension-8 effective operators. In this work, we study the pure gauge operators of dimension-8 that contribute to nTGCs and are independent of the dimension-8 operator involving the Higgs doublet. We show that the pure gauge operators generate both ZγZ* and Zγγ*
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Experimental tests for a liquid-liquid critical point in water Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-26 Domenico Mallamace, Carmelo Corsaro, Francesco Mallamace, H. Eugene Stanley
Water is a fascinating material. Its composition is simple—one oxygen and two hydrogen atoms—but its chemistry and physics are extremely complex and exhibit 75 documented anomalies. Although these anomalies and their molecular origin are not completely understood, we know that hydrogen bonds play key roles in all of the phases of water. Moreover, there is experimental evidence that the polymorphism
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The intrinsic nature of materials failure and the global non-equilibrium energy criterion Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-23 Biao Wang
Materials failure under some sort of loading is a well-known natural phenomenon, and the reliable prediction of materials failure is the most important key issue for many different kinds of engineering structures based on their safety considerations. In this research, instead of establishing empirical models, the material failure process was modeled as a nonequilibrium process based on the microstructural
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Even-odd-dependent optical transitions of zigzag monolayer black phosphorus nanoribbons Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-21 Pu Liu, XianZhe Zhu, XiaoYing Zhou, GuangHui Zhou, Kai Chang
We analytically study the electronic structure and optical properties of zigzag-edged phosphorene nanoribbons (ZPNRs) using the tight-binding Hamiltonian and Kubo formula. By directly solving the discrete Schrodinger equation, we obtain the energy spectra and wavefunctions for N-ZPNR (where TV is the number of transverse zigzag atomic chains) and classify the eigenstates according to the lattice symmetry
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Deterministic measurement-device-independent quantum secret sharing Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-21 ZiKai Gao, Tao Li, ZhenHua Li
Multiparty quantum communication ensures information-theoretic security for transmitting private information among multiuser networks. In principle, measurement-device-independent (MDI) techniques can close all detection loopholes while usually utilizing large amounts of quantum resources in basis reconciliation. We propose a three-party MDI quantum secret sharing (QSS) protocol that is secure against
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Machine learning for nanohertz gravitational wave detection and parameter estimation with pulsar timing array Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-20 MengNi Chen, YuanHong Zhong, Yi Feng, Di Li, Jin Li
Studies have shown that the use of pulsar timing arrays (PTAs) is among the approaches with the highest potential to detect very low-frequency gravitational waves in the near future. Although the capture of gravitational waves (GWs) by PTAs has not been reported yet, many related theoretical studies and some meaningful detection limits have been reported. In this study, we focused on the nanohertz
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More than softer-when-brighter: The X-ray powerlaw spectral variability in NGC 4051 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-10-16 Yun-Jing Wu, Jun-Xian Wang, Zhen-Yi Cai, Jia-Lai Kang, Teng Liu, Zheng Cai
The powerlaw X-ray spectra of active galactic nuclei at moderate to high accretion rates normally appear softer when they brighten, for which the underlying mechanisms are yet unclear. Utilizing XMM-Newton observations and excluding photons < 2 keV to avoid contamination from the soft excess, in this work we scrutinize the powerlaw spectral variability of NCG 4051 from two new aspects. We first find
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Cosmological parameter estimation from large-scale structure deep learning Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-09-11 ShuYang Pan, MiaoXin Liu, Jaime Forero-Romero, Cristiano G. Sabiu, ZhiGang Li, HaiTao Miao, Xiao-Dong Li
We propose a light-weight deep convolutional neural network (CNN) to estimate the cosmological parameters from simulated 3-dimensional dark matter distributions with high accuracy. The training set is based on 465 realizations of a cubic box with a side length of 256 h−1 Mpc, sampled with 1283 particles interpolated over a cubic grid of 1283 voxels. These volumes have cosmological parameters varying
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The Tianlai Cylinder Pathfinder array: System functions and basic performance analysis Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-09-10 JiXia Li, ShiFan Zuo, FengQuan Wu, YouGang Wang, JuYong Zhang, ShiJie Sun, YiDong Xu, ZiJie Yu, Reza Ansari, YiChao Li, Albert Stebbins, Peter Timbie, YanPing Cong, JingChao Geng, Jie Hao, QiZhi Huang, JianBin Li, Rui Li, DongHao Liu, YingFeng Liu, Tao Liu, John P. Marriner, ChenHui Niu, Ue-Li Pen, Jeffery B. Peterson, HuLi Shi, Lin Shu, YaFang Song, HaiJun Tian, GuiSong Wang, QunXiong Wang, RongLi
The Tianlai Cylinder Pathfinder is a radio interferometer array designed to test techniques for 21 cm intensity mapping in the post-reionization Universe, with the ultimate aim of mapping the large scale structure and measuring cosmological parameters such as the dark energy equation of state. Each of its three parallel cylinder reflectors is oriented in the north-south direction, and the array has
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Experimental demonstration of switching entangled photons based on the Rydberg blockade effect Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-09-07 Yi-Chen Yu, Ming-Xin Dong, Ying-Hao Ye, Guang-Can Guo, Dong-Sheng Ding, Bao-Sen Shi
The long-range interaction between Rydberg-excited atoms endows a medium with large optical nonlinearity. Here, we demonstrate an optical switch to operate on a single photon from an entangled photon pair under a Rydberg electromagnetically induced transparency configuration. With the presence of the Rydberg blockade effect, we switch on a gate field to make the atomic medium nontransparent thereby
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High-energy-density pentazolate salts: CaN 10 and BaN 10 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-09-08 JiaNan Yuan, Kang Xia, JueFei Wu, Jian Sun
The search for high energy density materials (HEDMs) in polymeric nitrogen compounds has gained considerable attention. Previous theoretical predictions and experiments have revealed that metal ions can be used to stabilize the pentazolate (N −5 ) anion. In this work, by employing a machine learning-accelerated crystal structure searching method and first-principles calculations, we found that the
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Effect of substrate elasticity on evaporation kinetics and evaporative deposition of aqueous polystyrene nanoparticles droplets Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-09-02 Ying-Song Yu; Yi-Qi Zhu; XianFu Huang; Jin-Zhi Zhou; An Zhou
Evaporation of aqueous polystyrene (PS) nanoparticles droplets on silicon and polydimethylsiloxane (PDMS) surfaces was studied. Experimental results showed that softer PDMS surfaces yielded a longer constant contact radius (CCR) stage, which could be ascribed to surface deformation of PDMS induced by the vertical component of liquid-vapor interfacial tension. Ringlike depositions of nanoparticles with
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Diagnostic of spectral lines in magnetized solar atmosphere: Formation of the H β line in sunspots Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-28 HongQi Zhang
Formation of the Hβ λ4861.34 Å line is an important topic related to the diagnosis of the basic configuration of magnetic fields in the solar and stellar chromospheres. Specifically, broadening of the Hβ λ4861.34 Å line occurs due to the magnetic and micro-electric fields in the solar atmosphere. The formation of Hβ in the model umbral atmosphere is presented based on the assumption of non-local thermodynamic
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Quantum secure direct communication with entanglement source and single-photon measurement Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-25 Lu Yang; JiaWei Wu; ZaiSheng Lin; LiuGuo Yin; GuiLu Long
Quantum secure direct communication (QSDC) transmits information directly over a quantum channel. In addition to security in transmission, it avoids loopholes of key loss and prevents the eavesdropper from getting ciphertext. In this article, we propose a QSDC protocol using entangled photon pairs. This protocol differs from existing entanglement-based QSDC protocols because it does not perform Bell-state
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Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co 3 Sn 2 S 2 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-24 Chang Liu; JianLei Shen; JiaCheng Gao; ChangJiang Yi; Di Liu; Tao Xie; Lin Yang; Sergey Danilkin; GuoChu Deng; WenHong Wang; ShiLiang Li; YouGuo Shi; HongMing Weng; EnKe Liu; HuiQian Luo
We report a comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 with a quasi-two-dimensional structure. Both in-plane and out-of-plane dispersions of the spin waves were revealed in the ferromagnetic state. Similarly, dispersive but damped spin excitations were found in the paramagnetic state. The effective exchange interactions were estimated using
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Enhanced entanglement and asymmetric EPR steering between magnons Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-20 Sha-Sha Zheng; Feng-Xiao Sun; Huai-Yang Yuan; Zbigniew Ficek; Qi-Huang Gong; Qiong-Yi He
The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen (EPR) steering in macroscopic systems are outstanding challenges in modern physics. Especially, the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties
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Possible quantum paraelectric state in Kitaev spin liquid candidate H 3 LiIr 2 O 6 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-14 Shuai Wang; Long Zhang; Fa Wang
A new quantum spin liquid (QSL) candidate material H3LiIr2O6 was synthesized recently and was found not to show any magnetic order or phase transition down to low temperatures. In this work, we study the quantum dynamics of the hydrogen ions, i.e., protons, in this material by combining first-principles calculations and theoretical analysis. We show that each proton and its adjacent oxygen ions form
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Pre-inflation and trans-Planckian censorship Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-11 Yong Cai; YunSong Piao
We investigate the implication of trans-Planckian censorship conjecture (TCC) for the initial state of primordial perturbations. It is possible to set the state of perturbation modes in the infinite past as the Minkowski vacuum, only if the pre-inflationary era is past-complete. We calculate the evolution of the perturbation modes in such a pre-inflationary era and show that at the beginning of inflation
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Electronic structure of LaIrIn 5 and f-electron character in its related Ce-115 compounds Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-06 Rui Zhou; XueBing Luo; ZhaoFeng Ding; Lei Shu; XingYu Ji; ZiHao Zhu; YaoBo Huang; DaWei Shen; ZhengTai Liu; ZhongHao Liu; Yun Zhang; QiuYun Chen
LaIrIn5 is a reference compound of the heavy-fermion superconductor CeIrIn5. The lack of f electrons in LaIrIn5 indicates that there should not be any f electron participating in the construction of its Fermi surface. Thus the electronic structure comparison between LaIrIn5 and CeIrIn5 provides a good platform to study the properties of f electrons. Here angle-resolved photoemission spectroscopy (ARPES)
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Nonreciprocal directional dichroism in multiferroics Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-04 Yang Shen; Bing Yu; WenYi Tong; QingBiao Zhao; ChunGang Duan
Nonreciprocal directional dichroism in multiferroics, namely magnetoelectric coupling in the dynamic regime, is endowed with rich physics and promising applications, which are entangled with fundamental physical components, such as spin, orbital, lattice, charge, and topology. Such a linear nonreciprocal response behavior in the GHz-THz frequency range, represented by optical magnetoelectric effect
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Partially coherent vortex beams: Fundamentals and applications Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-03 Miao Dong; ChengLiang Zhao; YangJian Cai; YuanJie Yang
It has been over 30 years since the concept of optical vortices was first proposed by Coullet et al. in 1989, and the field of structured beams has grown extremely. In the last two decades, partially coherent vortex beams (PCVBs) have received increasing interest in the fields of optical manipulation, optical communication, optical imaging, etc., and great progress has been made in the area of the
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Selective excitation of two-wave structure depending on crystal orientation under shock compression Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-03 QiLin Xiong; Takahiro Shimada; Takayuki Kitamura; ZhenHuan Li
Single crystals subjected to shock compression exhibit responses with distinct two-wave structures for certain crystal orientations. However, little is known to date regarding how the shock response depends on crystal orientation, and especially why the two-wave structure depends on the crystal orientation. In this work, molecular dynamics simulations of shock compressions in copper single crystals
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Triple plasmon-induced transparency and outstanding slow-light in quasi-continuous monolayer graphene structure Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-08-03 CuiXiu Xiong; Hui Xu; MingZhuo Zhao; BaiHui Zhang; Chao Liu; Biao Zeng; Kuan Wu; BanXian Ruan; Min Li; HongJian Li
We propose a simple quasi-continuous monolayer graphene structure and achieve a dynamically tunable triple plasmon-induced transparency (PIT) effect in the proposed structure. Additional analyses indicate that the proposed structure contains a self-constructed bright-dark-dark mode system. A uniform theoretical model is introduced to investigate the spectral response characteristics and slow light-effects
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Visible frequency broadband dielectric metahologram by random Fourier phase-only encoding Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-07-30 XuYue Guo; Peng Li; BingJie Li; Sheng Liu; BingYan Wei; Wei Zhu; JinZhan Zhong; ShuXia Qi; JianLin Zhao
In recent years, metasurfaces that enable the flexible wavefront modulation at sub-wavelength scale have been widely used into holographic display, due to its prominent advantages in polarization degrees of freedom, viewing angle, and achromaticity in comparison with traditional holographic devices. In holography, the computational complexity of hologram, imaging sharpness, energy utilization, reproduction
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Ga 2 O 3 solar-blind position-sensitive detectors Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-07-27 Kaiyong Li; Xun Yang; Yongzhi Tian; Yancheng Chen; Chaonan Lin; Zhenfeng Zhang; Zhiyang Xu; Jinhao Zang; Chongxin Shan
Monoclinic Ga2O3 (β-Ga2O3) is a promising material for achieving solar-blind photodetection because of its unique characteristics, including its high breakdown electric field, radiation hardness, thermal and chemical stabilities, and intrinsic visible/solar-blind properties. Until now, several studies have investigated the development of high-performance β-Ga2O3 solar-blind photodetectors. However
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Short-pulsed Raman fiber laser and its dynamics Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-30 Jun Liu; Jiadong Wu; Hualong Chen; Yu Chen; Zhenhong Wang; Chunyang Ma; Han Zhang
We provide a perspective review over the recent development of short-pulsed Raman fiber lasers (RFLs), which can provide laser emissions with flexible wavelengths for a variety of applications as well as an excellent platform to investigate various nonlinear pulse dynamics behaviors that cannot be captured in conventional rare-earth (RE) doped counterparts. Various pulse generation techniques have
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Electronic structure evolution accompanying heavy fermion formation in CeCu 2 Si 2 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-24 XueBing Luo; Yun Zhang; QiuYun Chen; Qin Liu; LiZhu Luo; ShiYong Tan; XieGang Zhu; XinChun Lai
The cooper pairs in the heavy-fermion superconductor CeCu2Si2 are formed of heavy fermions. Therefore, the heavy fermions are fundamental to the emergence of unconventional superconductivity and associated non-Fermi-liquid behavior in the normal state. The interplay between localization and itinerancy manifested on the electronic structure is key for understanding the heavyfermion behavior. Here, via
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Spin excitations in nickelate superconductors Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-23 Tao Zhou; Yi Gao; ZiDan Wang
Applying a three-band model and the random phase approximation, we theoretically study the spin excitations in nickelate superconductors, which have been newly discovered. The spin excitations were found to be incommensurate in the low energy region. The spin resonance phenomenon emerged as the excitation energy increased. The intensity can be maximized at the incommensurate or commensurate momentum
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Flow and magnetic structures in a kinematic ABC-dynamo Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-22 Tao Zhang; ZhiLiang Lin; ChenYang Huang; Alistair G. L. Borthwick
Dynamo theory describes the magnetic field induced by the rotating, convecting and electrically conducting fluid in a celestial body. The classical ABC-flow model represents fast dynamo action, required to sustain such a magnetic field. In this letter, Lagrangian coherent structures (LCSs) in the ABC-flow are detected through Finite-time Lyapunov exponents (FTLE). The flow skeleton is identified by
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Investigation of point-contact Andreev reflection on magnetic Weyl semimetal Co 3 Sn 2 S 2 Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-22 He Wang; YanZhao Liu; HuiBin Zhou; HaoRan Ji; JiaWei Luo; JiaWei Zhang; TianHeng Wei; PinYuan Wang; Shuang Jia; Jian Wang
Magnetic Weyl semimetals (WSMs) with broken time-reversal symmetry (TRS) hosting topological band structures are expected to provide an ideal platform for investigating topological superconductivity and spintronics. However, the experimental verification of magnetic WSMs is very challenging. Very recently, the kagome magnet Co3Sn2S2 was confirmed to be a magnetic WSM by both angle-resolved photoemission
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Few-layer metasurfaces with arbitrary scattering properties Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-22 Zhancheng Li; Wenwei Liu; Hua Cheng; Shuqi Chen
Metasurfaces, which are planar arrays of subwavelength artificial structures, have emerged as excellent platforms for the integration and miniaturization of electromagnetic devices and provided ample possibilities for single-dimensional and multidimensional manipulations of electromagnetic waves. However, owing to the limited interactions between planar thin metallic nanostructures and electromagnetic
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A data-efficient self-supervised deep learning model for design and characterization of nanophotonic structures Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-22 Wei Ma; Yongmin Liu
With its tremendous success in many machine learning and pattern recognition tasks, deep learning, as one type of data-driven models, has also led to many breakthroughs in other disciplines including physics, chemistry and material science. Nevertheless, the supremacy of deep learning over conventional optimization approaches heavily depends on the huge amount of data collected in advance to train
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Acoustic spin-1 Weyl semimetal Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-16 WeiYin Deng; XueQin Huang; JiuYang Lu; Feng Li; JiaHong Ma; ShuQi Chen; ZhengYou Liu
The study of topological semimetals hosting spin-1 Weyl points (WPs) beyond Dirac points and WPs has attracted a great deal of attention. However, a spin-1 Weyl semimetal that exclusively possesses spin-1 WPs in a clean frequency window without being shadowed by any other nodal points is yet to be discovered. This study reports a spin-1 Weyl semimetal in a phononic crystal. Its spin-1 WPs are touched
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Twist-teleportation-based local discrimination of maximally entangled states Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-04 Mao-Sheng Li; Shao-Ming Fei; Zong-Xing Xiong; Yan-Ling Wang
In this work, we study the local distinguishability of maximally entangled states (MESs). In particular, we are concerned with whether any fixed number of MESs can be locally distinguishable for sufficiently large dimensions. Fan and Tian et al. have already obtained two satisfactory results for the generalized Bell states (GBSs) and the qudit lattice states when applied to prime or prime power dimensions
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Impact of Ta/Ti electrodes on linearities of TaO x -based resistive random-access memories for neuromorphic computing Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-04 YiLin Fang; Tuo Shi; XuMeng Zhang; ZuHeng Wu; JunJie An; JinSong Wei; Jian Lu; Qi Liu
In this work, by incorporating different electrodes (Ta/Ti) onto TaOx dielectric layer, we studied both the conductance reading and conductance updating (long term potentiation and depression) linearities in the two RRAM devices. Owing to the composition modulation (CM) mechanism, the Ta-electrode device shows better conductance reading and updating linearities. The RRAM device linearities directly
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Efficient quantum arithmetic operation circuits for quantum image processing Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-06-04 Hai-Sheng Li; Ping Fan; Haiying Xia; Huiling Peng; Gui-Lu Long
Efficient quantum circuits for arithmetic operations are vital for quantum algorithms. A fault-tolerant circuit is required for a robust quantum computing in the presence of noise. Quantum circuits based on Clifford+T gates are easily rendered fault-tolerant. Therefore, reducing the T-depth and T-Count without increasing the qubit number represents vital optimization goals for quantum circuits. In
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Low temperature specific heat of 12442-type KCa 2 Fe 4 As 4 F 2 single crystals Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-29 Teng Wang; JiaNan Chu; JiaXin Feng; LingLing Wang; XuGuang Xu; Wei Li; HaiHu Wen; XiaoSong Liu; Gang Mu
Low-temperature specific heat (SH) is measured for the 12442-type KCa2Fe4As4F2 single crystal under different magnetic fields. A clear SH jump with the height of \(\Delta C/T|_{T_c}\) = 130 mJ moL−1 K−2 is observed at the superconducting transition temperature Tc. It is found that the electronic SH coefficient ∆γ(H) quickly increases when the field is in the low-field region below 3 T and then considerably
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Strong phonon-magnon coupling of an O/Fe(001) surface Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-25 Yan Zhu; YanFei Pan; JiYu Fan; ChunLan Ma; Jun Hu; XinYuan Wei; KaiCheng Zhang; HongBin Zhang
Using density functional calculations, we elucidate the interaction between magnons and phonons on Fe(001) and O/Fe(001) surfaces. The effective Heisenberg exchange parameters between neighbor sites (Ji) were derived by fitting the ab initio spin spiral dispersion relation to a classical Heisenberg model. In bulk Fe, J5b has a larger amplitude than J2b-J4b. Surface magnons were softer on the Fe(001)
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High-entropy alloy and amorphous alloy composites fabricated by ultrasonic vibrations Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-22 Xiong Liang; XiaoLong Zhu; Xin Li; RuoDong Mo; YongJing Liu; Kai Wu; Jiang Ma
We successfully fabricate high-entropy alloys and amorphous alloy composites by adopting the proposed ultrasonic vibration method. The low-stress, low-temperature method enables us to create composites that combine both amorphous and crystalline properties. Microscopic observations and computed tomography measurements indicate good bonding quality without pores or cracks in the composites. Due to the
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Erratum to: Algorithmic cooling based on cross-relaxation and decoherence-free subspace Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-19 HengYan Wang, Jian Pan, WenQiang Zheng, XinHua Peng
In this work, HengYan Wang and Jian Pan contributed equally to this work. The annotation for the contribution was omitted in the original publication of this paper [1]. It can be conformed in the submitted PDF version of the manuscript. Hence, the sentence “HengYan Wang and Jian Pan contributed equally to this work.” should be added.
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Tunable optical second-order sideband effects in a parity-time symmetric optomechanical system Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-19 Xing Xiao; QingHong Liao; NanRun Zhou; WenJie Nie; YongChun Liu
We theoretically investigate the optical second-order sideband generation (OSSG) in an optical parity-time (PT) symmetric system, which consists of a passive cavity trapping the atomic ensemble and an active cavity. Compared with the double-passive system, it is found that near the exceptional point (EP), the efficiency of the OSSG increases sharply not only for the blue probepump detuning resonant
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Anomalous phonon softening in the topological insulator Sn-doped Bi 1.1 Sb 0.9 Te 2 S Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-19 BoWen Li; WenChao Jiang; GuanYu Chen; Ying Xiang; Wei Xie; YaoMin Dai; XiYu Zhu; Huan Yang; Hai-Hu Wen
Investigations into the phonon behavior provide important information on interactions between different excitations in quantum materials. We perform a detailed study of the phonon behavior in the topological insulator Sn-doped Bi1.1Sb0.9Te2S using infrared spectroscopy. We observe two IR-active phonon modes at about 64 and 165 cm−1, which are labeled with α and β, respectively. While the evolution
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Identification of surface nanobubbles and resolving their size-dependent stiffness Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-19 YouQuan Jia; BinYu Zhao; Abbasali Abouei Mehrizi; Chuan Wang; Yi Xu; LongQuan Chen
We report a comparative investigation of the topographic features and nanomechanical responses of surface nanobubbles, polymeric nanodrops, and solid microparticles submerged in water and probed by atomic force microscopy in different operating modes. We show that these microscopic objects exhibit similar topographies, either hemispherical or hemiellipsoidal, in the standard tapping mode, and thus
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Investigation of β-Ga 2 O 3 films and β-Ga 2 O 3 /GaN heterostructures grown by metal organic chemical vapor deposition Sci. China Phys. Mech. Astronomy (IF 4.226) Pub Date : 2020-05-19 YaChao Zhang; YiFan Li; ZhiZhe Wang; Rui Guo; ShengRui Xu; ChuanYang Liu; ShengLei Zhao; JinCheng Zhang; Yue Hao
In this work, (-2 0 1) β-Ga2O3 films are grown on GaN substrate by metal organic chemical vapor deposition (MOCVD). It is revealed that the β-Ga2O3 film grown on GaN possesses superior crystal quality, material homogeneity and surface morphology than the results of common heteroepitaxial β-Ga2O3 film based on sapphire substrate. Further, the relevance between the crystal quality of epitaxial β-Ga2O3
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