Precision mapping the topological bands of 2D spin-orbit coupling with microwave spin-injection spectroscopy  

作　　者：Xiao-Tian Xu Chang-Rui Yi Bao-Zong Wang Wei Sun Youjin Deng Xiong-Jun Liu Shuai Chen Jian-Wei Pan 

机构地区：[1]Shanghai Branch,National Research Center for Physical Sciences at Microscale and Department of Modern Physics,University of Science and Technology of China,Shanghai 201315,China [2]Chinese Academy of Sciences Center for Excellence:Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230326,China [3]International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China [4]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China

出　　处：《Science Bulletin》2018年第22期1464-1469,共6页科学通报（英文版）

基　　金：supported by the National Key R&D Program of China (2016YFA0301601 and 2016YFA0301604);the National Natural Science Foundation of China (11674301, 11761161003, and 11625522);the Thousand-Young-Talent Program of China

摘　　要：To investigate the band structure is one of the key approaches to study the fundamental properties of a novel material.We report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an optical lattice.By applying the microwave spin-injection spectroscopy, the band structure and spin-polarization distribution are achieved simultaneously.The band topology is also addressed with observing the band gap close and re-open at the Dirac points.Furthermore, the lattice depth and the Raman coupling strength are precisely calibrated with relative errors in the order of 10^(-3).Our approach could also be applied for exploring the exotic topological phases with even higher dimensional system.To investigate the band structure is one of the key approaches to study the fundamental properties of a novel material.We report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an optical lattice.By applying the microwave spin-injection spectroscopy, the band structure and spin-polarization distribution are achieved simultaneously.The band topology is also addressed with observing the band gap close and re-open at the Dirac points.Furthermore, the lattice depth and the Raman coupling strength are precisely calibrated with relative errors in the order of 10^(-3).Our approach could also be applied for exploring the exotic topological phases with even higher dimensional system.

关 键 词：2D SPIN-ORBIT coupling MICROWAVE SPIN-INJECTION SPECTROSCOPY Spin polarization TOPOLOGICAL band TOPOLOGICAL phase transition 

分 类 号：N[自然科学总论]