3 years ago

Precision mapping the topological bands of 2D Spin-Orbit Coupling with Microwave spin-injection Spectroscopy

Xiao-tian Xu, Chang-rui Yi, Bao-zong Wang, Wei Sun, Youjin Deng, Xiong-jun Liu, Shuai Chen, Jian-wei Pan

Publication date: Available online 9 November 2018

Source: Science Bulletin

Author(s): Xiao-Tian Xu, Chang-Rui Yi, Bao-Zong Wang, Wei Sun, Youjin Deng, Xiong-Jun Liu, Shuai Chen, Jian-Wei Pan

Abstract

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.

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