• Front Phys. (IF 2.502) Pub Date : 2020-10-07
Miao Zhu, Muhammad Umair Ali, Changwei Zou, Wei Xie, Songquan Li, Hong Meng

Tactile and temperature sensors are the key components for e-skin fabrication. Organic transistors, a kind of intrinsic logic devices with diverse internal configurations, offer a wide range of options for sensor design and have played a vital role in the fabrication of e-skin-oriented tactile and temperature sensors. This research field has attained tremendous advancements, both in terms of materials

更新日期：2020-10-20
• Front Phys. (IF 2.502) Pub Date : 2020-10-07
Lu Qi, Guo-Li Wang, Shutian Liu, Shou Zhang, Hong-Fu Wang

We propose a scheme to investigate the topological phase transition and the topological state transfer based on the small optomechanical lattice under the realistic parameters regime. We find that the optomechanical lattice can be equivalent to a topologically nontrivial Su-Schrieffer-Heeger (SSH) model via designing the effective optomechanical coupling. Especially, the optomechanical lattice experiences

更新日期：2020-10-20
• Front Phys. (IF 2.502) Pub Date : 2020-10-05
Yuan-Yuan Wang, Feng-Ping Li, Wei Wei, Bai-Biao Huang, Ying Dai

Van der Waals (vdW) heterobilayers formed by two-dimensional (2D) transition metal dichalcogenides (TMDCs) created a promising platform for various electronic and optical properties, ab initio band results indicate that the band offset of type-II band alignment in TMDCs vdW heterobilayer could be tuned by introducing Janus WSSe monolayer, instead of an external electric field. On the basis of symmetry

更新日期：2020-10-20
• Front Phys. (IF 2.502) Pub Date : 2020-10-05
San-Dan Wang, Jin-Peng Yuan, Li-Rong Wang, Lian-Tuan Xiao, Suo-Tang Jia

We experimentally demonstrate the cesium electric quadrupole transition from the 6S1/2 ground state to the 7D3/2,5/2 excited state through a virtual level by using a single laser at 767 nm. The excited state energy level population is characterized by varying the laser power, the temperature of the vapor, and the polarization combinations of the laser beams. The optimized experimental parameters are

更新日期：2020-10-20
• Front Phys. (IF 2.502) Pub Date : 2020-10-19
Yu-Fei Yan, Lan Zhou, Wei Zhong, Yu-Bo Sheng

Measurement-device-independent quantum key distribution (MDI-QKD) provides us a powerful approach to resist all attacks at detection side. Besides the unconditional security, people also seek for high key generation rate, but MDI-QKD has relatively low key generation rate. In this paper, we provide an efficient approach to increase the key generation rate of MDI-QKD by adopting multiple degrees of

更新日期：2020-10-19
• Front Phys. (IF 2.502) Pub Date : 2020-10-19
Sadegh Imani Yengejeh, William Wen, Yun Wang

Transition metal dichalcogenide (TMD) monolayers attract great attention due to their specific structural, electronic and mechanical properties. The formation of their lateral heterostructures allows a new degree of flexibility in engineering electronic and optoelectronic dervices. However, the mechanical properties of the lateral heterostructures are rarely investigated. In this study, a comparative

更新日期：2020-10-19
• Front Phys. (IF 2.502) Pub Date : 2020-10-17
Ming-Xiu Sui, Zi-Bo Zhang, Xiao-Dan Chi, Jia-Yu Zhang, Yong Hu

A Monte Carlo simulated-annealing algorithm was used to study the magnetic state in an in-plane helimagnet layer on triangular lattice that exchange couples to an underlayer with strong out-of-plane anisotropy. In the single helimagnet layer with in-plane anisotropy (K), the formation of labyrinthlike domains with local spin spirals, instead of parallel stripes, is favored, and these domains rapidly

更新日期：2020-10-17
• Front Phys. (IF 2.502) Pub Date : 2020-10-15
Yang Liu, Le Luo

Chemistry in the ultracold regime enables fully quantum-controlled interactions between atoms and molecules, leading to the discovery of the hidden mechanisms in chemical reactions which are usually curtained by thermal averaging in the high temperature. Recently a couple of diatomic molecules have been cooled to ultracold regime based on laser cooling techniques, but the chemistry associated with

更新日期：2020-10-15
• Front Phys. (IF 2.502) Pub Date : 2020-10-13
Qiang Yuan, Bing-Qiang Qiao, Yi-Qing Guo, Yi-Zhong Fan, Xiao-Jun Bi

Recently the AMS-02 reported the precise measurements of the energy spectra of medium-mass compositions (Neon, Magnesium, Silicon) of primary cosmic rays, which reveal different properties from those of light compositions (Helium, Carbon, Oxygen). Here we propose a nearby source scenario, together with the background source contribution, to explain the newly measured spectra of cosmic ray Ne, Mg, Si

更新日期：2020-10-13
• Front Phys. (IF 2.502) Pub Date : 2020-10-13
Si Liu, Hongnan Wu, Xiaotao Zhang, Wenping Hu

Rubrene, a superstar in organic semiconductors, has achieved unprecedented achievements in the application of electronic devices, and research based on its various photoelectric properties is still in progress. In this review, we introduced the preparation of rubrene crystal, summarized the applications in organic optoelectronic devices with the latest research achievements based on rubrene semiconductors

更新日期：2020-10-13
• Front Phys. (IF 2.502) Pub Date : 2020-10-08
Zhi-Yue Zheng, Yu-Hao Pan, Teng-Fei Pei, Rui Xu, Kun-Qi Xu, Le Lei, Sabir Hussain, Xiao-Jun Liu, Li-Hong Bao, Hong-Jun Gao, Wei Ji, Zhi-Hai Cheng

The interlayer bonding in two-dimensional (2D) materials is particularly important because it is not only related to their physical and chemical stability but also affects their mechanical, thermal, electronic, optical, and other properties. To address this issue, we report the direct characterization of the interlayer bonding in 2D SnSe using contact-resonance atomic force microscopy (CR-AFM) in this

更新日期：2020-10-08
• Front Phys. (IF 2.502) Pub Date : 2020-10-07
Qinye Li, Siyao Qiu, Baohua Jia

Water electrolysis is to split water into hydrogen and oxygen using electricity as the driving force. To obtain low-cost hydrogen in a large scale, it is critical to develop electrocatalysts based on earth abundant elements with a high efficiency. This computational work started with Cobalt on CoTa2O6 surface as the active site, CoTa2O6/Graphene heterojunctions have been explored as potential oxygen

更新日期：2020-10-08
• Front Phys. (IF 2.502) Pub Date : 2020-10-07
Fen Lyu, Ya-Ping Li, Shu-Jin Hou, Jun-Jie Wei, Jin-Jun Geng, Xue-Feng Wu

The variability in multi-pulse gamma-ray bursts (GRBs) may help to reveal the mechanism of underlying processes from the central engine. To investigate whether the self-organized criticality (SOC) phenomena exist in the prompt phase of GRBs, we statistically study the properties of GRBs with more than 3 pulses in each burst by fitting the distributions of several observed physical variables with a

更新日期：2020-10-08
• Front Phys. (IF 2.502) Pub Date : 2020-10-07
Cheng-Bing Qin, Xi-Long Liang, Shuang-Ping Han, Guo-Feng Zhang, Rui-Yun Chen, Jian-Yong Hu, Lian-Tuan Xiao, Suo-Tang Jia

Monolayer transition metal dichalcogenides have emerged as promising materials for optoelectronic and nanophotonic devices. However, the low photoluminescence (PL) quantum yield (QY) hinders their various potential applications. Here we engineer and enhance the PL intensity of monolayer WS2 by femtosecond laser irradiation. More than two orders of magnitude enhancement of PL intensity as compared to

更新日期：2020-10-08
• Front Phys. (IF 2.502) Pub Date : 2020-10-02
Zhi-Min Liu, Ye Yang, Yue-Shao Zheng, Qin-Jun Chen, Ye-Xin Feng

Black phosphorus (BP), a layered van der Waals (vdW) crystal, has unique in-plane band anisotropy and many resulting anisotropy properties such as the effective mass, electron mobility, optical absorption, thermal conductivity and plasmonic dispersion. However, whether anisotropic or isotropic charge screening exist in BP remains a controversial issue. Based on first-principles calculations, we study

更新日期：2020-10-02
• Front Phys. (IF 2.502) Pub Date : 2020-10-02
Zhi-Xin Yang, Liang Wang, Yu-Mu Liu, Dong-Yang Wang, Cheng-Hua Bai, Shou Zhang, Hong-Fu Wang

We propose to realize the ground state cooling of magnomechanical resonator in a parity-time ($${\cal P}{\cal T}$$)-symmetric cavity magnomechanical system composed of a loss ferromagnetic sphere and a gain microwave cavity. In the scheme, the magnomechanical resonator can be cooled close to its ground state via the magnomechanical interaction, and it is found that the cooling effect in {\cal P}{\cal 更新日期：2020-10-02 • Front Phys. (IF 2.502) Pub Date : 2020-09-30 Shuang Zhou, Lu You, Hailin Zhou, Yong Pu, Zhigang Gui, Junling Wang Copper indium thiophosphate, CuInP2S6, has attracted much attention in recent years due to its van der Waals layered structure and robust ferroelectricity at room temperature. In this review, we aim to give an overview of the various properties of CuInP2S6, covering structural, ferroelectric, dielectric, piezoelectric and transport properties, as well as its potential applications. We also highlight 更新日期：2020-10-02 • Front Phys. (IF 2.502) Pub Date : 2020-09-16 Dimuthu Wijethunge, Lei Zhang, Cheng Tang, Aijun Du Favourable band alignment and excellent visible light response are vital for photochemical water splitting. In this work, we have theoretically investigated how ferroelectric polarization and its reversibility in direction can be utilized to modulate the band alignment and optical absorption properties. For this objective, 2D van der Waals heterostructures (HTSs) are constructed by interfacing monolayer 更新日期：2020-09-16 • Front Phys. (IF 2.502) Pub Date : 2020-09-05 Jing-Min Ru; Zhen-Kun Wu; Ya-Gang Zhang; Feng Wen; Yu-Zong Gu In this study, we report on the fractional Talbot effect of nonparaxial self-accelerating beams in a multilevel electromagnetically induced transparency (EIT) atomic configuration, which, to the best of our knowledge, is the first study on this subject. The Talbot effect originates from superposed eigenmodes of the Helmholtz equation and forms in the EIT window in the presence of both linear and cubic 更新日期：2020-09-05 • Front Phys. (IF 2.502) Pub Date : 2020-09-05 Jia Liu; Xian Liao; Jiayu Liang; Mingchao Wang; Qinghong Yuan The two-dimensional (2D) C3N has emerged as a material with promising applications in high performance device owing to its intrinsic bandgap and tunable electronic properties. Although there are several reports about the bandgap tuning of C3N via stacking or forming nanoribbon, bandgap modulation of bilayer C3N nanoribbons (C3NNRs) with various edge structures is still far from well understood. Here 更新日期：2020-09-05 • Front Phys. (IF 2.502) Pub Date : 2020-08-17 Zhitao Cui; Wei Du; Chengwei Xiao; Qiaohong Li; Rongjian Sa; Chenghua Sun; Zuju Ma MoS2 is a promising candidate for hydrogen evolution reaction (HER), while its active sites are mainly distributed on the edge sites rather than the basal plane sites. Herein, a strategy to overcome the inertness of the MoS2 basal surface and achieve high HER activity by combining single-boron catalyst and compressive strain was reported through density functional theory (DFT) computations. The ab 更新日期：2020-08-17 • Front Phys. (IF 2.502) Pub Date : 2020-08-08 Sen Jia; Xingyu Zhou; Chengping Shen The three lowest-lying Υ states, i.e., Υ(1S), Υ(2S), and Υ(3S), composed of b\(\overline b pairs and below the B$$\overline B$$ threshold, provide a ood platform for the researches of hadronic physics and physics beyond the Standard Model. They can be produced directly in e+e− colliding experiments, such as CLEO, Babar, and Belle, with low continuum backgrounds. In these experiments, many measurements

更新日期：2020-08-08
• Front Phys. (IF 2.502) Pub Date : 2020-07-23
Chen-Xiao Zhao; Jin-Feng Jia

Two dimensional (2D) topological insulators (TIs) and topological superconductors (TSCs) have been intensively studied for recent years due to their great potential for dissipationless electron transportation and fault-tolerant quantum computing, respectively. Here we focus on stanene, the tin analogue of graphene, to give a brief review of their development as a candidate for both 2D TI and TSC. Stanene

更新日期：2020-07-23
• Front Phys. (IF 2.502) Pub Date : 2020-07-21
Ya-Hui Mao; Huan Shan; Jin-Rong Wu; Ze-Jun Li; Chang-Zheng Wu; Xiao-Fang Zhai; Ai-Di Zhao; Bing Wang

Superconducting metal dichalcogenides (MDCs) present several similarities to the other layered superconductors like cuprates. The superconductivity in atomically thin MDCs has been demonstrated by recent experiments, however, the investigation of the superconductivity intertwined with other orders are scarce. Investigating the pseudogap in atomic layers of MDCs may help to understand the superconducting

更新日期：2020-07-21
• Front Phys. (IF 2.502) Pub Date : 2020-07-15
Wen Tong; Qun Wei; Hai-Yan Yan; Mei-Guang Zhang; Xuan-Min Zhu

Based on structure prediction method, the machine learning method is used instead of the density functional theory (DFT) method to predict the material properties, thereby accelerating the material search process. In this paper, we established a data set of carbon materials by high-throughput calculation with available carbon structures obtained from the Samara Carbon Allotrope Database. We then trained

更新日期：2020-07-15
• Front Phys. (IF 2.502) Pub Date : 2020-07-11
Xiao-Jun Tan; You-Jin Deng; Jesper Lykke Jacobsen

We study N-cluster correlation functions in four- and five-dimensional (4D and 5D) bond percolation by extensive Monte Carlo simulation. We reformulate the transfer Monte Carlo algorithm for percolation [Phys. Rev. E72, 016126 (2005)] using the disjoint-set data structure, and simulate a cylindrical geometry Ld−1 × ∞, with the linear size up to L = 512 for 4D and 128 for 5D. We determine with a high

更新日期：2020-07-11
• Front Phys. (IF 2.502) Pub Date : 2020-07-11
Jing Xu; Sai Li; Tao Chen; Zheng-Yuan Xue

Quantum gates, which are the essential building blocks of quantum computers, are very fragile. Thus, to realize robust quantum gates with high fidelity is the ultimate goal of quantum manipulation. Here, we propose a nonadiabatic geometric quantum computation scheme on superconducting circuits to engineer arbitrary quantum gates, which share both the robust merit of geometric phases and the capacity

更新日期：2020-07-11
• Front Phys. (IF 2.502) Pub Date : 2020-07-11
Qiong-Lin Dai; Xiao-Xuan Liu; Kai Yang; Hong-Yan Cheng; Hai-Hong Li; Fagen Xie; Jun-Zhong Yang

Chimera states, a symmetry-breaking spatiotemporal pattern in nonlocally coupled identical dynamical units, have been identified in various systems and generalized to coupled nonidentical oscillators. It has been shown that strong heterogeneity in the frequencies of nonidentical oscillators might be harmful to chimera states. In this work, we consider a ring of nonlocally coupled bicomponent phase

更新日期：2020-07-11
• Front Phys. (IF 2.502) Pub Date : 2020-07-11
Yong-Hao Gao; Xu-Ping Yao; Fei-Ye Li; Gang Chen

Pyrochlore magnets can be a unique platform to demonstrate numerous important concepts and applications of frustrated magnetic physics in modern condensed matter physics. Most works on pyrochlore magnets deal with the interacting spin-1/2 local moments, while much less works have studied the spin-1 systems. We here review the physics with interacting spin-1 local moments on the pyrochlore lattice to

更新日期：2020-07-11
• Front Phys. (IF 2.502) Pub Date : 2020-07-07
Wei-Dong Zhou; Yu-Hui Guo; Ran-Ran Zhang

Recently, laser ablation assisted spark induced breakdown spectroscopy (LA-SIBS) has been growing rapidly and continue to be extended to a broad range of materials analysis. Characterized by employing a specifically designed high voltage and pulse discharge circuit to generate a spark and used to enhance plasma emission produced by laser ablation, allows direct analysis of materials without prior sample

更新日期：2020-07-07
• Front Phys. (IF 2.502) Pub Date : 2020-07-07
Xiang-Guo Meng; Kai-Cai Li; Ji-Suo Wang; Zhen-Shan Yang; Xiao-Yan Zhang; Zhen-Tao Zhang; Bao-Long Liang

Using an operator ordering method for some commutative superposition operators, we introduce two new multi-variable special polynomials and their generating functions, and present some new operator identities and integral formulas involving the two special polynomials. Instead of calculating complicated partial differential, we use the special polynomials and their generating functions to concisely

更新日期：2020-07-07
• Front Phys. (IF 2.502) Pub Date : 2020-07-06
Bing Zhang

A formula is proposed to quantitatively estimate the signal emission rate of Communicating Extra-Terrestrial Intelligent civilizations (CETIs) in the Galaxy. I suggest that one possible type of CETI signal would be brief radio bursts similar to fast radio bursts (FRBs). A dedicated search for FRB-like artificial signals in the Galaxy for decades may pose a meaningful upper limit on the emission rate

更新日期：2020-07-06
• Front Phys. (IF 2.502) Pub Date : 2020-06-10
Yang-Yang Fu; Jia-Qi Tao; Ai-Ling Song; You-Wen Liu; Ya-Dong Xu

In this work, we designed and studied a feasible dual-layer binary metagrating, which can realize controllable asymmetric transmission and beam splitting with nearly perfect performance. Owing to ingenious geometry configuration, only one meta-atom is required to design for the metagrating system. By simply controlling air gap between dual-layer metagratings, high-efficiency beam splitting can be well

更新日期：2020-06-10
• Front Phys. (IF 2.502) Pub Date : 2020-06-10
Xiang-Ru Li; Wo-Liang Yu; Xi-Long Fan; G. Jogesh Babu

This work investigates the problem of detecting gravitational wave (GW) events based on simulated damped sinusoid signals contaminated with white Gaussian noise. It is treated as a classification problem with one class for the interesting events. The proposed scheme consists of the following two successive steps: decomposing the data using a wavelet packet, representing the GW signal and noise using

更新日期：2020-06-10
• Front Phys. (IF 2.502) Pub Date : 2020-05-30
Ying-Xun Zhang; Ning Wang; Qing-Feng Li; Li Ou; Jun-Long Tian; Min Liu; Kai Zhao; Xi-Zhen Wu; Zhu-Xia Li

In this review article, we first briefly introduce the transport theory and quantum molecular dynamics model applied in the study of the heavy ion collisions from low to intermediate energies. The developments of improved quantum molecular dynamics model (ImQMD) and ultra-relativistic quantum molecular dynamics model (UrQMD), are reviewed. The reaction mechanism and phenomena related to the fusion

更新日期：2020-05-30
• Front Phys. (IF 2.502) Pub Date : 2020-05-05
Yong-Jia Wang; Qing-Feng Li

The equation of state (EOS) of nuclear matter, i.e., the thermodynamic relationship between the binding energy per nucleon, temperature, density, as well as the isospin asymmetry, has been a hot topic in nuclear physics and astrophysics for a long time. The knowledge of the nuclear EOS is essential for studying the properties of nuclei, the structure of neutron stars, the dynamics of heavy ion collision

更新日期：2020-05-05
• Front Phys. (IF 2.502) Pub Date : 2020-04-24
Li Zhao; Jianglai Liu

The nature of dark matter is one of the greatest mysteries in modern physics and astronomy. A wide variety of experiments have been carried out worldwide to search for the evidence of particle dark matter. Chinese physicists started experimental search for dark matter about ten years ago, and have produced results with high scientific impact. In this paper, we present an overview of the dark matter

更新日期：2020-04-24
• Front Phys. (IF 2.502) Pub Date : 2020-04-23
Yi-Wen Zhang; Shi-Long Su; Shu-Bin Xie; Wei-Min Zhou; Hao Liu

Using theoretical analysis and numerical calculation method, the axial adiabatic compression of a spinning non-ideal gas in a cylinder with a smooth surface is investigated. We show that the axial pressure of a spinning gas will gradually become lower than that of a stationary gas during continuous compression, even though the initial axial pressure of the spinning gas is larger than that of the stationary

更新日期：2020-04-23
• Front Phys. (IF 2.502) Pub Date : 2020-04-23
Si Li; Zhi-Ming Yu; Yugui Yao; Shengyuan A. Yang

Topological metals (TMs) are a kind of special metallic materials, which feature nontrivial band crossings near the Fermi energy, giving rise to peculiar quasiparticle excitations. TMs can be classified based on the characteristics of these band crossings. For example, according to the dimensionality of the crossing, TMs can be classified into nodal-point, nodal-line, and nodal-surface metals. Another

更新日期：2020-04-23
• Front Phys. (IF 2.502) Pub Date : 2020-04-03
Yang-Min Guo, Lian-Bo Guo, Jia-Ming Li, Hong-Di Liu, Zhi-Hao Zhu, Xiang-You Li, Yong-Feng Lu, Xiao-Yan Zeng

In the original publication of the article, there is one mistake in the authors’ affiliations. Prof. Yong-Feng Lu’s affiliation should be: Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA.

更新日期：2020-04-21
• Front Phys. (IF 2.502) Pub Date : 2020-04-03
Xin Li; Peng Wang; Ya-Qiang Wu; Zhen-Hua Liu; Qian-Qian Zhang; Ting-Ting Zhang; Ze-Yan Wang; Yuan-Yuan Liu; Zhao-Ke Zheng; Bai-Biao Huang

In this work, we prepared ZnGeP2 (ZGP) photocatalyst using single flat temperature zone (SFT) method in a vacuum quartz ampoule. The XRD, SEM, EDS, DRS and XPS were used to characterize the crystal structure, morphology, elemental content, optical absorption and band gap structure of ZGP. The results of photocatalytic hydrogen evolution and apparent quantum efficiency show that ZGP is a promising photocatalyst

更新日期：2020-04-03
• Front Phys. (IF 2.502) Pub Date : 2020-04-03
Mike Guidry; Yang Sun; Lian-Ao Wu; Cheng-Li Wu

We review application of the SU(4) model of strongly-correlated electrons to cuprate and iron-based superconductors. A minimal self-consistent generalization of BCS theory to incorporate antiferromagnetism on an equal footing with pairing and strong Coulomb repulsion is found to account systematically for the major features of high-temperature superconductivity, with microscopic details of the parent

更新日期：2020-04-03
• Front Phys. (IF 2.502) Pub Date : 2020-04-01
Michael L. Goodman; Chiman Kwan; Bulent Ayhan; Eric L. Shang

All three components of the current density are required to compute the heating rate due to free magnetic energy dissipation. Here we present a first test of a new model developed to determine if the times of increases in the resistive heating rate in active region (AR) photospheres are correlated with the subsequent occurrence of M and X flares in the corona. A data driven, 3D, non-force-free magnetohydrodynamic

更新日期：2020-04-01
• Front Phys. (IF 2.502) Pub Date : 2020-04-01
X.-J. Hao; R.-Y. Yuan; J.-J. Jin; Y. Guo

Using the transfer matrix method, spin- and valley-dependent electron transport properties modulated by the velocity barrier were studied in the normal/ferromagnetic/normal monolayer MoS2 quantum structure. Based on Snell’s Law in optics, we define the velocity barrier as ξ = v2/v1 by changing the Fermi velocity of the intermediate ferromagnetic region to obtain a deflection condition during the electron

更新日期：2020-04-01
• Front Phys. (IF 2.502) Pub Date : 2020-03-06
Xiao-Dong Wu; Yi-Jun Wang; Duan Huang; Ying Guo

We propose a novel scheme for measurement-device-independent (MDI) continuous-variable quantum key distribution (CVQKD) by simultaneously conducting classical communication and QKD, which is called “simultaneous MDI-CVQKD” protocol. In such protocol, each sender (Alice, Bob) can superimpose random numbers for QKD on classical information by taking advantage of the same weak coherent pulse and an untrusted

更新日期：2020-03-06
• Front Phys. (IF 2.502) Pub Date : 2020-03-05
Qian Shen; Yun You; Jie Xu; Yun Shen; Xiaohua Deng; Zhuoyuan Wang; Weidong Min; Linfang Shen; Sanshui Xiao

We propose a uniform backfire-to-endfire leaky-wave antenna (LWA) based on a topological one-way waveguide under external bias magnetic field. We systematically analyze the dispersion, showing that the proposed structure supports leaky mode arisen from total internal reflection. By means of tuning frequency or magnetic field, we obtain fixed-bias frequency and fixed-frequency bias LWA with continuous

更新日期：2020-03-05
• Front Phys. (IF 2.502) Pub Date : 2020-03-05
Yuan Gan; Jiyuan Liang; Chang-woo Cho; Si Li; Yanping Guo; Xiaoming Ma; Xuefeng Wu; Jinsheng Wen; Xu Du; Mingquan He; Chang Liu; Shengyuan A. Yang; Kedong Wang; Liyuan Zhang

Recently, the layered transition metal dichalcogenide 1T′-MoTe2 has generated considerable interest due to their superconducting and non-trivial topological properties. Here, we present a systematic study on 1T′-MoTe2 single-crystal and exfoliated thin-flakes by means of electrical transport, scanning tunnelling microscope (STM) measurements and band structure calculations. For a bulk sample, it exhibits

更新日期：2020-03-05
• Front Phys. (IF 2.502) Pub Date : 2020-03-05
Ji-Zhou Wu; Yu-Qing Li; Wen-Liang Liu; Jie Ma; Lian-Tuan Xiao; Suo-Tang Jia

The light-induced frequency shift (LIFS) of ultracold molecular ro-vibrational levels originates from the strong coupling of the atomic-scattering state and the bound-molecular state. In this paper, we present our experimental determination of the LIFSs of the lowest vibrational levels (ν = 0, 1) in the purely long-range $$0_g^-$$ state of ultracold cesium molecules. A high-resolution double photoassociation

更新日期：2020-03-05
• Front Phys. (IF 2.502) Pub Date : 2020-01-15
Jian-Ping Li; Lian-Zhong Deng; Ye Zheng; Peng-Peng Ding; Tian-Qing Jia; Zhen-Rong Sun; Jian-Rong Qiu; Shi-An Zhang

The spectral phase of the femtosecond laser field is an important parameter that affects the upconversion (UC) luminescence efficiency of dopant lanthanide ions. In this work, we report an experimental study on controlling the UC luminescence efficiency in Sm3+:NaYF4 glass by 800-nm femtosecond laser pulse shaping using spectral phase modulation. The optimal phase control strategy efficiently enhances

更新日期：2020-01-15
• Front Phys. (IF 2.502) Pub Date : 2020-01-13
Tong Liu; Zhen-Fei Zheng; Yu Zhang; Yu-Liang Fang; Chui-Ping Yang

We propose a method for transferring quantum entangled states of two photonic cat-state qubits (cqubits) from two microwave cavities to the other two microwave cavities. This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit. Because of using four cavities with different frequencies, the inter-cavity crosstalk is significantly reduced. Since only one coupler

更新日期：2020-01-13
• Front Phys. (IF 2.502) Pub Date : 2020-01-13
Thomas Pope; Werner Hofer

The exact form of the kinetic energy functional has remained elusive in orbital-free models of density functional theory (DFT). This has been the main stumbling block for the development of a general-purpose framework on this basis. Here, we show that on the basis of a two-density model, which represents many-electron systems by mass density and spin density components, we can derive the exact form

更新日期：2020-01-13
• Front Phys. (IF 2.502) Pub Date : 2020-01-08
Xiao-Ming Huang; Li-Zhao Liu; Si Zhou; Ji-Jun Zhao

Graphene oxide (GO), the functionalized graphene with oxygenated groups (mainly epoxy and hydroxyl), has attracted resurgent interests in the past decade owing to its large surface area, superior physical and chemical properties, and easy composition with other materials via surface functional groups. Usually, GO is used as an important raw material for mass production of graphene via reduction. However

更新日期：2020-01-08
• Front Phys. (IF 2.502) Pub Date : 2020-01-08
Junwei Fu; Shuandi Wang; Zihua Wang; Kang Liu; Huangjingwei Li; Hui Liu; Junhua Hu; Xiaowen Xu; Hongmei Li; Min Liu

Single-atom photocatalysts, due to their high catalysis activity, selectivity and stability, become a hotspot in the field of photocatalysis. Graphitic carbon nitride (g-C3N4) is known as both a good support for single atoms and a star photocatalyst. Developing g-C3N4-based single-atom photocatalysts exhibits great potential in improving the photocatalytic performance. In this review, we summarize

更新日期：2020-01-08
• Front Phys. (IF 2.502) Pub Date : 2020-01-03
Jin-Fu Chen; Yu-Han Ma; Chang-Pu Sun

Quantum walk (QW), which is considered as the quantum counterpart of the classical random walk (CRW), is actually the quantum extension of CRW from the single-coin interpretation. The sequential unitary evolution engenders correlation between different steps in QW and leads to a non-binomial position distribution. In this paper, we propose an alternative quantum extension of CRW from the ensemble interpretation

更新日期：2020-01-03
• Front Phys. (IF 2.502) Pub Date : 2020-01-03
He Gao; Shun-Ke Ai; Zhou-Jian Cao; Bing Zhang; Zhen-Yu Zhu; Ang Li; Nai-Bo Zhang; Andreas Bauswein

With a selected sample of neutron star (NS) equations of state (EOSs) that are consistent with the current observations and have a range of maximum masses, we investigate the relations between NS gravitational mass Mg and baryonic mass Mb, and the relations between the maximum NS mass supported through uniform rotation (Mmax) and that of nonrotating NSs (MTOV). We find that for an EOS-independent quadratic

更新日期：2020-01-03
• Front Phys. (IF 2.502) Pub Date : 2019-12-23
Chuan Yue; Peng-Xiong Ma; Qiang Yuan; Yi-Zhong Fan; Zhan-Fang Chen; Ming-Yang Cui; Hao-Ting Dai; Tie-Kuang Dong; Xiaoyuan Huang; Wei Jiang; Shi-Jun Lei; Xiang Li; Cheng-Ming Liu; Hao Liu; Yang Liu; Chuan-Ning Luo; Xu Pan; Wen-Xi Peng; Rui Qiao; Yi-Feng Wei; Li-Bo Wu; Zhi-Hui Xu; Zun-Lei Xu; Guan-Wen Yuan; Jing-Jing Zang; Ya-Peng Zhang; Yong-Jie Zhang; Yun-Long Zhang

Precise measurements of the energy spectra of cosmic rays (CRs) show various kinds of features deviating from single power-laws, which give very interesting and important implications on their origin and propagation. Previous measurements from a few balloon and space experiments indicate the existence of spectral softenings around 10 TV for protons (and probably also for Helium nuclei). Very recently

更新日期：2019-12-23
• Front Phys. (IF 2.502) Pub Date : 2019-12-11
Y. X. Zhao

It was understood that Chern insulators cannot be realized in the presence of PT symmetry. In this paper, we reveal a new class of PT-symmetric Chern insulators, which has internal degrees of freedom forming real representations of a symmetry group with a complex endomorphism field. As a generalization to the conventional 2n-dimensional Chern insulators with integer n ≥ 1, these PT-symmetric Chern

更新日期：2019-12-11
• Front Phys. (IF 2.502) Pub Date : 2019-11-28
Hangwen Guo; Mohammad Saghayezhian; Zhen Wang; Yimei Zhu; Jiandi Zhang; Ward Plummer

Complex oxide interfaces have been one of the central focuses in condensed matter physics and material science. Over the past decade, aberration corrected scanning transmission electron microscopy and spectroscopy has proven to be invaluable to visualize and understand the emerging quantum phenomena at an interface. In this paper, we briefly review some recent progress in the utilization of electron

更新日期：2019-11-28
• Front Phys. (IF 2.502) Pub Date : 2019-11-28
Lin Fa; Jiaojiao Tang; Qi Zhang; Minjin Zhang; Yandong Zhang; Meng Liang; Meishan Zhao

We explore the physical phenomenon of acoustic waves induced at the interface between two different anisotropic rock media. Specifically, one medium is a transversely isotropic medium with a vertical axis of symmetry (VTI medium) and the other one is a transversely isotropic medium with a tilt axis of symmetry (TTI medium). By solving the Kelvin-Christoffel equation, an eighth-order polynomial is established

更新日期：2019-11-28
• Front Phys. (IF 2.502) Pub Date : 2019-11-16
Luis Roa; Andrea Espinoza; Ariana Muñoz; María L. Ladrón de Guevara

In this paper we redesign the probabilistic teleportation scheme considered in Phys. Rev. A61, 034301 (2000) by Wan-Li Li et al., where the optimal state extraction protocol complements the basic teleportation process with a partially entangled pure state channel, in order to transfer the unknown state with fidelity 1. Unlike that scheme, where the information of the unknown state is lost if the state

更新日期：2019-11-16
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