Au(111)上单层WS$_2$的K谷自旋结构
材料科学
2018-10-02 v2 介观与纳米尺度物理
摘要
通过自旋及角分辨光电子能谱与逆光电子能谱，确定了Au(111)上单层WS的与'谷价带与导带的自旋结构。限制1.98 eV直接带隙的能带具有面外自旋极化，价带与导带中自旋相关能量分裂分别为417 meV与16 meV。自旋分裂能带的顺序在价带与导带中相同，而在与'高对称点为相反。首个观测解释了光学实验中讨论的“暗”激子，后者指向电子输运中耦合的自旋与谷物理。实验观测的能带色散连同自由站立单层及Au(111)上单层的能带结构计算一并讨论。
引用
@article{arxiv.1807.11235,
title = {Spin structure of K valleys in single-layer WS$_2$ on Au(111)},
author = {Philipp Eickholt and Charlotte Sanders and Maciej Dendzik and Luca Bignardi and Daniel Lizzit and Silvano Lizzit and Albert Bruix and Philip Hofmann and Markus Donath},
journal= {arXiv preprint arXiv:1807.11235},
year = {2018}
}
备注
6 pages, 4 figures. Supplement available. This supplement includes details of the fitting procedure to extract peak positions and a tutorial on obtaining individual spin spectra from raw (inverse) photoemission data