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topological transition in Monolayer Blue Phosphorene with transition-Metal Adatom under Strain

Chinese Journal of Chemical Physics 2020年第4期33卷 443-449,I0001页

作者： Ge Hu Jun Hu School of Physical Science and Technology&Jiangsu Key Laboratory of Thin Films Soochow UniversitySuzhou 215006China.

We carried out first-principles calculations to investigate the electronic properties of the monolayer blue phosphorene(BlueP)decorated by the group-IVB transition-metal adatoms(Cr,Mo and W),and found that the Cr-decorated BlueP is a magnetic half metal,while the Mo-and W-decorated BlueP are semiconductors with band gaps smaller than 0.2 *** biaxial strains make the band gaps close and reopen,and band inversions occur during this process,which induces topological transitions in the Mo-decorated BlueP(with strain of-5.75%)and W-decorated BlueP(with strain of-4.25%)from normal insulators to topological insulators(TIs).The TI gap is 94 meV for the Mo-decorated BlueP and218 me V for the W-decorated *** large TI gaps demonstrate the possibility to engineer topological phases in the monolayer BlueP with transition-metal adatoms at high temperature.

关键词： topological transition Monolayer Blue phosphorene Biaxial strain transition-metal adatom

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Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 97-103页

作者： Zhicheng Rao Shangjie Tian Shunye Gao Quanxin Hu Wenhui Fan Jierui Huang Cenyao Tang Yaobo Huang Hechang Lei Yujie Sun Tian Qian Hong Ding Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Department of Physics South University of Science and TechnologyShenzhen 518055China

The CoSi family hosts unconventional topological nodes with nonzero Chern *** nontrivial topology is manifested by conspicuous surface Fermi arcs connecting surface projections of the ***,using angle-resolved photoemission spectroscopy,we have systematically investigated the(001)surface states of pristine and Ni-doped Co *** surface states form saddle-like band structures at/near the time-reversal invariant point near the Fermi *** Fermi arcs undergo consecutive Lifshitz transitions at the saddle points X,leading to changes of the Fermi arc *** the density of states has a van Hove singularity at the saddle points,exotic many-body physical phenomena may emerge accompanied by the topological transitions of surface Fermi arcs.

关键词： topological transition Fermi arcs saddle point

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Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources

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Advanced Photonics 2021年第3期3卷 73-82页

作者： Zhiwei Guo Yang Long Haitao Jiang Jie Ren Hong Chen Tongji University School of Physics Science and EngineeringShanghaiChina Tongji University MOE Key Laboratory of Advanced Micro-Structure MaterialsShanghaiChina Tongji University Center for Phononics and Thermal Energy ScienceChina-EU Joint Lab on NanophononicsShanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologyShanghaiChina

The unidirectional excitation of near-field optical modes is a fundamental prerequisite for many photonic applications,such as wireless power transfer and information *** experimentally construct all-electric Huygens and spin metasources and demonstrate anomalous unidirectional excitation of high-k hyperbolic modes in two types of hyperbolic *** use a Huygens metasource to study the unidirectional excitation of hyperbolic bulk modes in a planar hyperbolic metamaterial(HMM).Specifically,unidirectional excitation is the same as that in free space in the vertical direction,but opposite to that in free space in the horizontal *** anomalous unidirectional excitation is determined by the anisotropic HMM *** addition,we use a spin metasource to observe the anomalous photonic spin Hall effect in a planar hyperbolic *** a near-field source with a specific spin,the guide mode with a fixed directional wave vector is excited due to spin-momentum *** the directions of momentum and energy flows in the HMM waveguide are opposite,the unidirectional excitation of hyperbolic guided modes is *** results not only uncover the sophisticated electromagnetic functionalities of metasources in the near-field but may also provide novel opportunities for the development of integrated optical devices.

关键词： hyperbolic metasurfaces topological transition guided modes circuit-based metamaterials metasources

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Periodic orbits in the Chermnykh problem

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Astrodynamics 2017年第1期1卷 41-55页

作者： Xiangyuan Zeng Kyle T.Alfriend School of Automation Beijing Institute of TechnologyBeijing 100081China Department of Aerospace Engineering Texas A&M UniversityCollege StationTexas 77840USA

Periodic orbits in irregular gravitational fields are significant for an understanding of dynamical behaviors around asteroids as well as the engineering aspect for deep space explorations. The rotating mass dipole, referred to as the Chermnykh problem, is a good alternative model to study qualitative dynamical environments near elongated asteroids, like the asteroid 1620 Geographos, 216 Kleopatra, or 25143 Itokawa. In this paper a global searching method is adopted to search for periodic orbits around the dipole model based on the concept of Poincaré section of surface. Representative families of periodic orbits are illustrated with respect to all three topological cases of the dipole model. topological transitions of orbits during iso-energetic continuations are also presented as well as identification of new types of periodic orbits.

关键词： periodic orbits the Chermnykh problem topological transition iso-energetic continuation

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