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  • Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies
    Front Phys. (IF 2.483) 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

  • Experimental search for dark matter in China
    Front Phys. (IF 2.483) 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

  • Investigation into the improved axial compressibility of a spinning non-ideal gas
    Front Phys. (IF 2.483) 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

  • Type-II topological metals
    Front Phys. (IF 2.483) 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

  • Erratum to: Research progress in Asia on methods of processing laser-induced breakdown spectroscopy data
    Front Phys. (IF 2.483) 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.

  • ZnGeP 2 : A near-infrared-activated photocatalyst for hydrogen production
    Front Phys. (IF 2.483) 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

  • Fermion dynamical symmetry and strongly-correlated electrons: A comprehensive model of high-temperature superconductivity
    Front Phys. (IF 2.483) 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

  • A new approach to solar flare prediction
    Front Phys. (IF 2.483) 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

  • Influence of the velocity barrier on the massive Dirac electron transport in a monolayer MoS 2 quantum structure
    Front Phys. (IF 2.483) 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

  • Simultaneous measurement-device-independent continuous variable quantum key distribution with realistic detector compensation
    Front Phys. (IF 2.483) 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

  • Mechanically scanned leaky-wave antenna based on a topological one-way waveguide
    Front Phys. (IF 2.483) 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

  • Bandgap opening in MoTe 2 thin flakes induced by surface oxidation
    Front Phys. (IF 2.483) 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

  • Light-induced frequency shifts for the lowest vibrational levels of ultracold Cs 2 in the molecular pure long-range $$0_g^-$$0g− state
    Front Phys. (IF 2.483) 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

  • Optimal spectral phase control of femtosecond laser-induced up-conversion luminescence in Sm 3+ :NaYF 4 glass
    Front Phys. (IF 2.483) 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

  • Transferring entangled states of photonic cat-state qubits in circuit QED
    Front Phys. (IF 2.483) 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

  • Exact orbital-free kinetic energy functional for general many-electron systems
    Front Phys. (IF 2.483) 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

  • Physical properties and device applications of graphene oxide
    Front Phys. (IF 2.483) 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

  • Graphitic carbon nitride based single-atom photocatalysts
    Front Phys. (IF 2.483) 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

  • Relation between gravitational mass and baryonic mass for non-rotating and rapidly rotating neutron stars
    Front Phys. (IF 2.483) 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

  • Directional quantum random walk induced by coherence
    Front Phys. (IF 2.483) 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

  • Implications on the origin of cosmic rays in light of 10 TV spectral softenings
    Front Phys. (IF 2.483) 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

  • Equivariant PT -symmetric real Chern insulators
    Front Phys. (IF 2.483) 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

  • Visualizing quantum phenomena at complex oxide interfaces: An atomic view from scanning transmission electron microscopy
    Front Phys. (IF 2.483) 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

  • Reflection and refraction of elastic wave at VTI-TTI media interface
    Front Phys. (IF 2.483) 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

  • Recovering information in probabilistic quantum teleportation
    Front Phys. (IF 2.483) Pub Date : 2019-11-16
    Luis Roa, Andrea Espinoza, Ariana Muñoz, María L. Ladrón de Guevara

    Abstract 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

  • Tetrapartite entanglement features of W-Class state in uniform acceleration
    Front Phys. (IF 2.483) Pub Date : 2019-11-16
    Qian Dong, Ariadna J. Torres-Arenas, Guo-Hua Sun, Shi-Hai Dong

    Abstract Using the single-mode approximation, we first calculate entanglement measures such as negativity (1–3 and 1–1 tangles) and von Neumann entropy for a tetrapartite W-Class system in noninertial frame and then analyze the whole entanglement measures, the residual π4 and geometric Π4 average of tangles. Notice that the difference between π4 and Π4 is very small or disappears with the increasing

  • Extraction of gravitational wave signals with optimized convolutional neural network
    Front Phys. (IF 2.483) Pub Date : 2019-11-15
    Hua-Mei Luo, Wenbin Lin, Zu-Cheng Chen, Qing-Guo Huang

    Abstract Gabbard et al. have demonstrated that convolutional neural networks can achieve the sensitivity of matched filtering in the recognization of the gravitational-wave signals with high efficiency [Phys. Rev. Lett. 120, 141103 (2018)]. In this work we show that their model can be optimized for better accuracy. The convolutional neural networks typically have alternating convolutional layers and

  • Motile parameters of cell migration in anisotropic environment derived by speed power spectrum fitting with double exponential decay
    Front Phys. (IF 2.483) Pub Date : 2019-11-15
    Yan-Ping Liu, Xiang Li, Jing Qu, Xue-Juan Gao, Qing-Zu He, Li-Yu Liu, Ru-Chuan Liu, Jian-Wei Shuai

    Abstract Cell migration through anisotropic microenvironment is critical to a wide variety of physiological and pathological processes. However, adequate analytical tools to derive motile parameters to characterize the anisotropic migration are lacking. Here, we proposed a method to obtain the four motile parameters of migration cells based on the anisotropic persistent random walk model which is described

  • Electromagnetically induced transparency in novel dual-band metamaterial excited by toroidal dipolar response
    Front Phys. (IF 2.483) Pub Date : 2019-11-15
    Zhao-Yang Shen, He-Lin Yang, Xuan Liu, Xiao-Jun Huang, Tian-Yu Xiang, Jiong Wu, Wei Chen

    Abstract We demonstrated a novel metamaterial with dual-band electromagnetically induced transparency (EIT) via simulation, experiment and numerical analysis, with resonance frequencies of the transparency peaks of 7.60 and 10.27 GHz. The E-ε metamaterial unit cells were composed of E-shaped and ε-shaped patterns. By analyzing the surface current distribution and the magnetic field, we qualitatively

  • Understanding the physics of DNA using nanoscale single-molecule manipulation.
    Front Phys. Pub Date : 2013-03-08
    Eric W Frey,Ashton A Gooding,Sitara Wijeratne,Ching-Hwa Kiang

    Processes for decoding the genetic information in cells, including transcription, replication, recombination and repair, involve the deformation of DNA from its equilibrium structures such as bending, stretching, twisting, and unzipping of the double helix. Single-molecule manipulation techniques have made it possible to control DNA conformation and simultaneously detect the induced changes, revealing

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