State Key Laboratory of Superlattices and Microstructures;
Institute of Semiconductors;
Chinese Academy of Sciences;
Beijing 100083;
China;
Center of Materials Science and Optoelectronics Engineering;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Beijing Academy of Quantum Information Sciences;
Beijing 100193;
China;
spin-orbit coupling; hidden spin polarization; tight-binding model; ab initio calculation;