Open AccessSpin-orbit and exchange interaction in a HgMnTe magnetic two-dimensional electron gas
Author(s) -
Qiu Zhi-Jun,
Gui Yong-Sheng,
Shu Xiao-Zhou,
Ning Dai,
Guo Shao-Ling,
Chu Jun-Hao
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.1977
Subject(s) - zero field splitting , zeeman effect , condensed matter physics , physics , magnetic field , energy level splitting , spin (aerodynamics) , exchange interaction , landau quantization , spin–orbit interaction , zeeman energy , fermi gas , electron , spin polarization , ferromagnetism , quantum mechanics , thermodynamics
Spin-orbit interaction and spd exchange interaction are investigated by analyzing beating patterns of Shubnikov-de Hass oscillations in a HgMnTe magnetic two-dimensional electron gas (2DEG) at various temperatures.The results show that (1) spin-orbit interaction results in zero-magnetic-field spin splitting in 2DEG; (2) spin-orbit interaction is dominant at low magnetic field, and the total spin-splitting decreases with increasing magnetic field due to the influence of Landau splitting and Zeeman splitting; (3) at a high magnetic field, the spd exchange interaction tends to saturate and the spin splitting corresponds to Zeeman splitting. The experiments demonstrate that the spin splitting deduced from fast Fourier transformation (FFT) of SdH oscillations versus. 1/B is different from zero-magnetic-field spin splitting when Zeeman spin splitting is comparable to zero-magnetic-field spin splitting.