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Stationary and moving solitons in spin-orbit-coupled spin-1 Bose-Einstein condensates

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Frontiers of physics 2018年第2期13卷 31-37页

作者： Yu-E Li Ju-Kui Xue Key Laboratory of Atomic Molecular Physics Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

We investigate the matter-wave sohtons in a spin-orbit-coupled spin-1 Bose-Einstein condensate us- ing a multiscale perturbation method. Beginning with the one-dimensional spin-orbit-coupled three- component Gross-Pitaevskii equations, we derive a single nonlinear SehrSdinger equation, which allows determination of the analytical soliton solutions of the system. Stationary and moving solitons in the system are derived. In particular, a parameter space for different existing soliton types is provided. It is shown that there exist only dark or bright sohtons when the spin-orbit coupling is weak, with the solitons depending onthe atomic interactions. However, when the spin-orbit coupling is strong, both dark and bright solitons exist, being determined by the Raman coupling. Our analytical solutions are confirmed by direct numerical simulations.

关键词： spin-orbit coupling Bose-Einstein condensate soliton perturbation method

Ferroelectricity generated by spin-orbit and spin-lattice couplings in multiferroic DyMnO3

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Frontiers of physics 2012年第4期7卷 408-417页

作者： Na Zhang Shuai Dong Jun-Ming Liu Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Department of Physics Henan Normal UniversityXinxiang 453007China Department of Physics Southeast UniversityNanjing 211189China Institute for Advanced Materials South China Normal UniversityGuangzhou 510631China International Center for Materials Physics Chinese Academy of SciencesShenyang 110016China

While the ferroelectricity in type-II multiferroic rare-earth manganites is believed to be generated by the inverse Dzyaloshinskii-Moriya （DM） interaction （spin orbit coupling） associated with the Mn spiral spin order, recent results revealed the strong spin-lattice coupling arising from the Dy-Mn spin interaction in DyMn03, which may also be an ingredient contributing to the ferroelectricity. In this work, we summarize our recent experiments on this issue by performing a series of rare-earth site nonmagnetic Y and magnetic Ho substitutions at Dy site for DyMn03. It is demonstrated that the Dy Mn spin interaction contributes to the ferroelectric polarization through the symmetric exchange striction mechanism （spin-lattice coupling）. A coexistence of the spin orbit coupling and spin-lattice coupling in one compound is confirmed. At the same time, the independent Dy antiferromagnetic spin order at low temperature can be effectively suppressed by the substitutions, beneficial to the polarization enhancement.

关键词： multiferroics spin-orbit coupling spin-lattice coupling coexistence

A computational investigation of topological insulator Bi2Se3 film

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Frontiers of physics 2014年第6期9卷 760-767页

作者： Yi-Bin Hu Yong-Hong Zhao Xue-Feng Wang Department of Physics MeGill University 3600 rue University Montrdal Qudbec H3A 2T8 Canada College of Physics and Electronic Engineering Institute of Solid State Physics Sichuan Normal University Chengdu 610068 China Department of Physics Soochow University Suzhou 215006 China

Topological insulators have a bulk band gap like a.n ordinary insulator and conducting states on their edge or surface which are formed by spin orbit coupling and protected by time-reversal sylnmetry. W＇e report theoretical analyses of tile electronic properties of three-dimensional topological insulator Bi2Sea film on different energies. We choose five different energies （ 123, -75, 0, 180. 350 meV） around the Dirac cone （ 113 meV）. When energy is close to the Dirac cone. the properties of wave function Inatch the topological insulator＇s halhnark perfectly. When energy is far way from tile Dirac cone, the halhnark of topological insulator is broken and the helical states disappear. The electronic properties of helical states are dug out fi＇om the calculation results. The spin-inomentum locking of the helical StatES are confirmed. A 3-fold symmetry of the helical states in Brillouin zone is also revealed. The penetration depth of tile helical states is two quintuple layers which can be identified from layer projection. Tile charge contribution on each quintuple layer depends on the energy, and has completely different behavior along K and M direction in Brillouin zone. From orbital projection, we can find that the maximum charge contribution of the helical states is p： orbit and the charge contribution on py and Px orbits have 2-fold symmetry.

关键词： topological insulator spin-orbit coupling helical state

Quantum anomalous Hall effect and giant Rashba spin-orbit splitting in graphene system co-doped with boron and 5d transition-metal atoms

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Frontiers of physics 2018年第5期13卷 79-86页

作者： Xinzhou Deng Hualing Yang Shifei Qi Xiaohong Xu Zhenhua Qiao CQD Hefei National Laboratory for Physical Sciences at Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics and Department of Physics University of Science and Technology of China Hefei 230026 China School of Chemistry and Materials Science Shanxi Normal University Linfen 041004 China

Quantum anomalous Hall effect （QAHE） is a fundamental quantum transport phenomenon in con- densed matter physics. Until now, the QAHE has only been experimentally realized for Cr/V-doped （Bi, Sb）2We3 but at an extremely low observational temperature, thereby limiting its potential appli- cation in dissipationless quantum electronics. By employing first-principles calculations, we study the electronic structures of graphene co-doped with 5d transition metal and boron atoms based on a com- pensated n-p co-doping scheme. Our findings are as follows： i） The electrostatic attraction between the n- and p-type dopants effectively enhances the adsorption of metal adatoms and suppresses their undesirable clustering, ii） Hf-B and Os-B co-doped graphene systems can establish long-range ferro- magnetic order and open larger nontrivial band gaps because of the stronger spin-orbit coupling with the non-vanishing Berry curvatures to host the high-temperature QAHE. iii） The calculated Rashba splitting energies in Re-B and Pt-B co-doped graphene systems can reach up to 158 and 85 meV, re- spectively, which are several orders of magnitude higher than the reported intrinsic spin-orbit coupling strength.

关键词： graphene quantum anomalous Hall effect spin-orbit coupling

Anomalous Hall Effect in spin-Polarized Two-Dimensional Hole Gas with Cubic-Rashbsa spin-orbit Interaction

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Communications in Theoretical Physics 2010年第9期54卷 559-562页

作者：任莉宓一鸣 College of Fundamental Studies Shanghai University of Engineering Science

Based on the Kubo formalism,the anomalous Hall effect in a magnetic two-dimensional hole gas withcubic-Rashba spin-orbit coupling is studied in the presence of 5-function scattering *** the weak,short-rangeddisorder scattering is considered in the Born approximation,we find that the self-energy becomes diagonal inthe helicity basis and its value is independent of the wave number,and the vertex correction to the anomalous Hallconductivity due to impurity scattering vanishes when both subbands are *** is to say,the anomalous Halleffect is not vanishing or influenced by the vertex correction for two-dimensional heavy-hole system,which is in sharpcontrast to the case of linear-Rashba spin-orbit coupling in the electron band when the short-range disorder scattering isconsidered and the extrinsic mechanism as well as the effect of external electric field on the SO interaction are ignored.

关键词： anomalous hall conductivity spin-orbit coupling vertex correction Green-function

Multireference calculations on low-lying states and the X^3 Π_u -~3 Π_g absorption spectra of indium dimers

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Chinese Physics B 2013年第4期22卷 227-231页

作者：周凌松闫冰金明星 Institute of Atomic and Molecular Physics Jilin University

Multireference configuration interaction calculations are carried out on 11 Λ–S low-lying electronic states of indium dimers. The states are investigated with spin–orbit pseudopotentials via the state-interacting method, and characterized by fitted spectroscopic constants based on computed potential energy curves. The vibrational structures of the double-potential well 0^＋g （I）（ ^3 Σ g^- ） state are also analyzed. The experimentally observed absorption spectrum centred at ～ 13000cm-1 is simulated and assigned to X 3 Πu （v＇=0）–3Πg transition according to the present ab initio calculations on transition energies and dipole moment functions.

关键词： indium dimer spin-orbit coupling spectroscopic constants transition dipole moment

Theoretical study of low-lying excited states of molecular aggregates. I. Development of linear-scaling TD-DFT

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Science China Chemistry 2013年第9期56卷 1263-1266页

作者： LIU WenJian MA Jing Beijing National Laboratory for Molecular Sciences Institute of Theoretical and Computational ChemistryState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular Engineeringand Center for Computational Science and EngineeringPeking University School of Chemistry and Chemical Engineering Institute of Theoretical and Computational ChemistryKey Laboratory of Mesoscopic Chemistry of MOENanjing University

The project aims to develop an integrated linear-scaling time-dependent density functional theory (TD-DFT) for studying low-lying excited states of luminescent molecular materials, especially those fluorescence and phosphorescence co-emitting systems. The central idea will be "from fragments to molecule" (FF2M). That is, the fragmental information will be employed to synthesize the molecular wave function, such that the locality (transferability) of the fragments (functional groups) is directly built into the algorithms. Both relativistic and spin-adapted open-shell TD-DFT will be considered. Use of the renormalized exciton method will also be made to further enhance the efficiency and accuracy of TD-DFT. Solvent effects are to be targeted with the fragment-based solvent model. It is expected that the integrated TD-DFT and program will be of great value in rational design of luminescent molecular materials.

关键词： linear-scaling TD-DFT from fragments to molecule spin-orbit coupling renormalized excitions fragment-based solvent model luminsescent molecular material

coupling Distant spins of Surface-State Electrons by Manipulating Their Collective Vibrations

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Communications in Theoretical Physics 2014年第1期61卷 131-134页

作者：曾勇张淼韦联福 Quantum Optoelectronics Laboratory School of Physics and TechnologySouthwest Jiaotong University State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-sen University

The system of electrons on liquid helium is an interesting candidate to implement quantum computation, due to the long coherence times of the qubits encoded by the electronic spins. In order to implement the quantum logic operations between the spins, we propose here a configuration, similarly to the cooled ions in a trap, to couple the distant electrons via manipulating their center of mass （CM） vibrations. First, we show that the electrons could be confined in a common harmonic oscillator potential by using an electrostatic field. Then, with a single current pulse （applied on the micro-electrode below the liquid helium） the distant electronic spins can be coupled simultaneously to the CM mode. Finally, by adiabatically eliminating the CM mode, effective interaction between the distant spins is induced for implementing the desired quantum computing.

关键词： electrons on liquid helium spin-orbit coupling collective vibrations

Emergent quantum phenomena in atomically engineered iridate heterostructures

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Fundamental Research 2023年第3期3卷 313-321页

作者： Lin Hao Di Yi Meng Wang Jian Liu Pu Yu Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefeiAnhui 230031China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China RIKEN Center for Emergent Matter Science(CEMS) Wako 351-0198Japan Department of Physics and Astronomy University of TennesseeKnoxvilleTennessee 37996USA State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China

Over the last few years,researches in iridates have developed into an exciting field with the discovery of numerous emergent phenomena,interesting physics,and intriguing *** the studies,iridate-based artificial structures play a crucial role owing to their extreme flexibility and tunability in lattice symmetry,chemical composition,and crystal *** this article,we present an overview of the recent progress regarding iridate-based artificial *** first explicitly introduce several essential concepts in ***,we illustrate important findings on representative SrIrO_(3)/SrTiO_(3) superlattices,heterostructures comprised of SrIrO3 and magnetic oxides,and their response to external electric-field ***,we comment on existing problems and promising future directions in this exciting field.

关键词： Iridate spin-orbit coupling Many-body physics Artificial crystalline structure Magnetism Magnetotransport property Ionic liquid gating