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SSRN 2024年

作者： Guan, Li Luo, Tao Chen, Zhijuan Zhang, Jianen Yin, Tao Ren, Xiaojie Shi, Weicai Liu, Chunzhi Chen, Xiaobo Li, Xu Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and Technology Hebei University Baoding071002 China Division of Energy Matter and Systems School of Science and Engineering University of Missouri - Kansas City KansasMO64110 United States

Phase stability in ambient conditions seriously hinders inorganic CsPbI3 perovskite solar cells. Black-colored γ phase CsPbI3 exhibit a more stable structure upon long-term exposure to higher temperature environments. Here, the lattice structure and defect properties of γ-CsPbI3 under biaxial strains on the (100), (010) and (001) planes were investigated by first principles method. The results show that the tensile strain effectively reduces the PbI6 octahedral tilt to maintain the structural stability, and improves the defect formation energies of VI, VPb, VCs and ICs. The compressive strain hinders the diffusion of VI along the octahedral path and makes the defect level of VI shallower. The biaxial strain on the (001) plane is favorable for preserving the black phase structure and defect properties, whereas that on the (100) or (010) plane is beneficial for modulating these properties. The present work provides a theoretical guidance for preparing stable and efficient γ-CsPbI3 perovskite solar cells using the strain strategy. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Optical Stark effect of a local defect on the TiO2(110) surface

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Physical Review B 2018年第8期98卷 081402(R)-081402(R)页

作者： Lihuan Sun Anning Dong Jianmei Li Dong Hao Xiangqian Tang Shichao Yan Yang Guo Xinyan Shan Xinghua Lu Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Center for Excellence in Topological Quantum Computation Chinese Academy of Sciences Beijing 100190 China

Probing the optical Stark effect at the single-molecule or atomic scale is crucial for understanding many photoinduced chemical and physical processes on surfaces. Here, we report a study about the optical Stark effect of single atomic defects on a TiO2(110) surface with photoassisted scanning tunneling spectroscopy. When a laser is coupled into the tunneling junction, the midgap state of the OH−O2 defects changes remarkably in differential conductance spectra. As the laser power gradually increases, the energy of the midgap state shifts away from the Fermi level with an increase in intensity and a broadening of the peak width. The observation can be explained as an optical Stark effect with the Autler-Townes formula. This large optical Stark effect is due to a tip enhancement and a strong dipole moment in the transient charged state during electron tunneling. Our study provides different aspects in exploring electron-photon interactions at the microscopic scale.

关键词： Electronic transitions Laser-cluster interaction Optical pumping Stark effect Surface states

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Fractional Quantum Zeno Effect Emerging from Non-Hermitian physics

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Physical Review X 2023年第3期13卷 031009-031009页

作者： Yue Sun Tao Shi Zhiyong Liu Zhidong Zhang Liantuan Xiao Suotang Jia Ying Hu State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Taiyuan 030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China

Exploring non-Hermitian phenomenology is an exciting frontier of modern physics. However, the demonstration of a non-Hermitian phenomenon that is quantum in nature has remained elusive. Here, we predict quantum non-Hermitian phenomena: the fractional quantum Zeno (FQZ) effect and FQZ-induced photon antibunching. We consider a quantum optics platform with reservoir engineering, where nonlinear emitters are coupled to a bath of decaying bosonic modes whose own decay rates form band structures. By engineering the dissipation band, the spontaneous emission of emitters can be suppressed by strong dissipation through an algebraic scaling with fractional exponents—the FQZ effect. This fractional scaling originates uniquely from the divergent dissipative density of states near the dissipation band edge, different from the traditional closed-bath context. We find FQZ-induced strong photon antibunching in the steady state of a driven emitter even for weak nonlinearities. Remarkably, we identify that the sub-Poissonian quantum statistics of photons, which has no classical analogs, stems here from the key role of non-Hermiticity. Our setup is experimentally feasible with the techniques used to design lattice models with dissipative couplings.

关键词： Light-matter interaction Photonics Quantum optics

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The solution to the ‘1/2 vs 3/2’ puzzle

arXiv

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arXiv 2022年

作者： Wang, Guo-Li Li, Qiang Wang, Tianhong Feng, Tai-Fu Wu, Xing-Gang Chang, Chao-Hsi Department of Physics Hebei University Baoding071002 China Key Laboratory of High-precision Computation Application of Quantum Field Theory of Hebei Province Baoding071002 China School of Physical Science and Technology Northwestern Polytechnical University Xi’an710072 China School of Physics Harbin Institute of Technology Harbin150001 China Department of Physics Chongqing Key Laboratory for Strongly Coupled Physics Chongqing University Chongqing401331 China Institute of Theoretical Physics Chinese Academy of Science Beijing100190 China P.O. Box 8730 Beijing100190 China

Using an almost complete relativistic method based on the Bethe-Salpeter equation, we study the mixing angle θ, the mass splitting ∆M, the strong decay widths Γ(D1(′)) and the weak production rates Br(B → D1(′)ν) of the D1(2420) and D1′ (2430). We find there is the strong cancellation between the 1P1 and 3P1 partial waves in D1′ (2430) with θ ∼ −35.3◦, which leads to the ‘1/2 vs 3/2’ puzzle. The puzzle can not be overcome by adding only relativistic corrections since in a large parameter range where ∆M is linear varying and not small, the θ, Γ(D1(′)) and Br(B → D1(′)ν) remain almost unchanged but conflict with data. While in a special range around the mass inverse point where ∆M = 0 and θ = ±90◦, they change rapidly but we find the windows where ∆M, Γ(D1(′)) and Br(B → D1(′)ν) are all consistent with data. The small ∆M confirmed by experiment, is crucial to solve the ‘1/2 vs 3/2’ puzzle. Copyright © 2022, The Authors. All rights reserved.

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Searching for lepton flavor violating decays τ → Pl in Minimal R-symmetric Supersymmetric Standard Model

arXiv

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arXiv 2020年

作者： Sun, Ke-Sheng Guo, Tao Li, Wei Yang, Xiu-Yi Zhao, Shu-Min Department of Physics Baoding University Baoding071000 China School of Mathematics and Science Hebei GEO University Shijiazhuang050031 China Department of Physics Hebei University Baoding071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China School of science University of Science and Technology Liaoning Anshan114051 China

Considering the constraints from the experimental data on branching ratios of τ → eγ and τ → µγ, we analyze the lepton flavor violating decays τ → Pl (P = π0, η, η0;l = e, µ) in the scenario of the minimal R-symmetric supersymmetric standard model. The numerical results show that the theoretical predictions on branching ratios of τ → Pl can be enhanced close to the upper experimental bounds or future sensitivities, meanwhile the theoretical predictions on branching ratios of τ → eγ and τ → µγ satisfy the present experimental bounds. Copyright © 2020, The Authors. All rights reserved.

关键词： Supersymmetry

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Electron-positron cascade in magnetospheres of spinning black holes

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Physical Review D 2018年第6期98卷 063016-063016页

作者： Alexander L. Ford Brett D. Keenan Mikhail V. Medvedev Department of Physics and Astronomy University of Kansas Lawrence Kansas 66045 USA Los Alamos National Lab Los Alamos NM 87545 Institute for Theory and Computation Harvard University Cambridge Massachusetts 02138 USA Laboratory for Nuclear Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy University of Kansas Lawrence KS 66045

We quantitatively study the stationary, axisymmetric, force-free magnetospheres of spinning (Kerr) black holes (BHs) and the conditions needed for relativistic jets to be powered by the Blandford-Znajek mechanism. These jets could be from active galactic nuclei, blazars, quasars, microquasars, radioactive galaxies, and other systems that host Kerr BHs. The structure of the magnetosphere determines how the BH energy is extracted, e.g., via the Blandford-Znajek mechanism, which converts the BH rotational energy into Poynting flux. The key assumption is the force-free condition, which requires the presence of plasma with the density being above the Goldreich-Julian density. Unlike neutron stars, which in principle can supply electrons from the surface, BHs cannot supply plasma at all. The plasma must be generated in situ via an electron-positron cascade, presumably in the gap region. Here we study varying conditions that provide a sufficient amount of plasma for the Blandford-Znajek mechanism to work effectively.

关键词： Electromagnetic radiation astronomy Gamma ray astronomy Space & astrophysical plasma Astronomical black holes Astrophysical jets

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Signature of Dirac semimetal states in gray arsenic studied by de Haas–van Alphen and Shubnikov–de Haas quantum oscillations

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Physical Review B 2020年第20期101卷 205109-205109页

作者： Linlin An Xiangde Zhu Yuting Qian Chuanying Xi Wei Ning Hongming Weng Mingliang Tian Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 Anhui China Department of Physics University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China School of Physics and Materials Sciences Anhui University Heifei 230601 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We report systematically studies of de Haas–van Alphen (dHvA) and Shubnikov–de Haas (SdH) quantum oscillations under high magnetic fields on gray arsenic, which has been suggested to be a topological insulator by first-principles calculations and angle-resolved photoemission spectroscopy. We observed large unsaturated magnetoresistance and pronounced quantum oscillations in two methods. By analysis of these quantum oscillation spectra, we obtained two major frequency branches around 3.8–18 and 153–162 T, and the light effective quasiparticle mass and nontrivial Berry phase. These results suggest that bulk crystals of gray arsenic may belong to the category of topological Dirac semimetals rather than topological insulators.

关键词： Electrical conductivity Fermi surface Landau levels Magnetotransport

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Space qualification of integrated photonic circuits fabricated by ultrafast laser writing 21

Space qualification of integrated photonic circuits fabricat...

引用

Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI 2021

作者： Piacentini, Simone Vogl, Tobias Corrielli, Giacomo Lam, Ping Koy Osellame, Roberto Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 Milano20133 Italy Piazza Leonardo da Vinci 32 Milano20133 Italy Centre for Quantum Computation and Communication Technology Department of Quantum Science Research School of Physics and Engineering The Australian National University ActonACT2601 Australia Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universitat Jena Jena07745 Germany Cavendish Laboratory University of Cambridge JJ Thomson Avenue CambridgeCB3 0HE United Kingdom

ISBN: (数字)9781510641884

ISBN: (纸本)9781510641877

Satellite-based optical quantum technologies represent a promising field for obtaining a worldwide quantum network. However, due to the limited size of satellites and the adverse conditions of a space environment, only compact and resistant devices can be used for this purpose. In this respect, we present for the first time the space qualification of integrated photonic circuits fabricated by Ultrafast Laser Writing. By inscribing different straight waveguides, directional couplers and Mach-Zehnder interferometer, and by exposing them to appropriate proton and gamma ray irradiations, we show that our integrated devices are suited for performing quantum experiments in a low Earth orbit. © 2021 SPIE. All rights reserved.

关键词： Fabrication

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Demonstration of Maxwell Demon-assistant Einstein-Podolsky-Rosen Steering via Superconducting Quantum Processor

arXiv

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arXiv 2023年

作者： Wang, Z.T. Wang, Ruixia Zhao, Peng Yang, Z.H. Huang, Kaixuan Xu, Kai Zhang, Yong-Sheng Fan, Heng Zhao, S.P. Hu, Meng-Jun Yu, Haifeng Beijing Academy of Quantum Information Sciences Beijing100193 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China CAS Center for Excellence in Topological Quantum Computation UCAS Beijing100190 China Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Songshan Lake Materials Laboratory Dongguan523808 China

The concept of Maxwell demon plays an essential role in connecting thermodynamics and information theory, while entanglement and non-locality are fundamental features of quantum theory. Given the rapid advancements in the field of quantum information science, there is a growing interest and significance in investigating the connection between Maxwell demon and quantum correlation. The majority of research endeavors thus far have been directed towards the extraction of work from quantum correlation through the utilization of Maxwell demon. Recently, a novel concept called Maxwell demon-assistant Einstein-Podolsky-Rosen (EPR) steering has been proposed, which suggests that it is possible to simulate quantum correlation by doing work. This seemingly counterintuitive conclusion is attributed to the fact that Alice and Bob need classical communication during EPR steering task, a requirement that does not apply in the Bell test. In this study, we demonstrate Maxwell demon-assistant EPR steering with superconducting quantum circuits. By compiling and optimizing a quantum circuit to be implemented on a 2D superconducting chip, we were able to achieve a steering parameter of S2 = 0.770 ± 0.005 in the case of two measurement settings, which surpasses the classical bound of 1/ √2 by 12.6 standard deviations. In addition, experimental observations have revealed a linear correlation between the nonlocality demonstrated in EPR steering and the work done by the demon. Considering the errors in practical operation, the experimental results are highly consistent with theoretical predictions. Our findings not only suggest the presence of a Maxwell demon loophole in the EPR steering, but also contribute to a deeper comprehension of the interplay between quantum correlation, information theory, and thermodynamics. © 2023, CC BY.

关键词： Information theory

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Spatial symmetry modulation of planar Hall effect in Weyl semimetals

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Physical Review B 2023年第7期107卷 075131-075131页

作者： Yi-Wen Wei Ji Feng Hongming Weng Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Applied Science Beijing Information Science and Technology University Beijing 100192 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China

The planar Hall effect in Weyl semimetals has been proposed as a key feature of chiral anomaly and nontrivial Berry curvature, while the effect of fundamental spatial symmetry remains to be explored. Here, we show with general symmetry analysis and lattice model calculations that the planar Hall effect can be significantly modulated by a certain class of spatial symmetry operations. The odd terms of conductivity with respect to magnetic field, including the linear terms, vanish in the plane perpendicular to the axis of twofold rotation (C2) or the C2 combined symmetry operations (mirror, twofold screw rotation, glide plane). When applying the magnetic field perpendicular to the glide plane, we find that the planar Hall conductivity in bulk forbidden by glide symmetry becomes nonzero in its quasi-two-dimensional counterpart with broken glide symmetry. It is further clarified that the nonzero planar Hall conductivity comes from surface states. This signature can be used to distinguish bulk and surface transport in Weyl semimetals.

关键词： Electrical conductivity Magnetotransport Topological materials Weyl semimetal

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