首页|Topological spin-orbit-coupled fermions beyond rotating wave approximation

Topological spin-orbit-coupled fermions beyond rotating wave approximation

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The realization of spin-orbit-coupled ultracold gases has driven a wide range of research and is typically based on the rotating wave approximation(RWA).By neglecting the counter-rotating terms,RWA char-acterizes a single near-resonant spin-orbit(SO)coupling in a two-level system.Here,we propose and experimentally realize a new scheme for achieving a pair of two-dimensional(2D)SO couplings for ultra-cold fermions beyond RWA.This work not only realizes the first anomalous Floquet topological Fermi gas beyond RWA,but also significantly improves the lifetime of the 2D-SO-coupled Fermi gas.Based on pump-probe quench measurements,we observe a deterministic phase relation between two sets of SO couplings,which is characteristic of our beyond-RWA scheme and enables the two SO couplings to be simultaneously tuned to the optimum 2D configurations.We observe intriguing band topology by measuring two-ring band-inversion surfaces,quantitatively consistent with a Floquet topological Fermi gas in the regime of high Chern numbers.Our study can open an avenue to explore exotic SO phy-sics and anomalous topological states based on long-lived SO-coupled ultracold fermions.

Spin-orbit couplingUltracold atomsFermi gasesQuantum simulationTopological phases of matter

Han Zhang、Wen-Wei Wang、Chang Qiao、Long Zhang、Ming-Cheng Liang、Rui Wu、Xu-Jie Wang、Xiong-Jun Liu、Xibo Zhang

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International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China

Collaborative Innovation Center of Quantum Matter,Beijing 100871,China

School of Physics and Institute for Quantum Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

Hefei National Laboratory,Hefei 230088,China

Beijing Academy of Quantum Information Sciences,Beijing 100193,China

International Quantum Academy,Shenzhen 518048,China

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Chinese Academy of Sciences Strategic Priority Research Program国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Open Project of Shenzhen Institute of Quantum Science and EngineeringHefei National LaboratoryScientific and Technological Innovation 2030 Key Program of Quantum Communication and Quantum ComputingScientific and Technological Innovation 2030 Key Program of Quantum Communication and Quantum Computing

XDB350201002021YFA14009002018YFA03056011187407312304564118254011220418712261160368SIQSE2020032021ZD03019032021ZD0302000

2024

10.1016/j.scib.2024.01.018

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(6)
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