Current-induced spin polarization in chiral Tellurium: a first-principles quantum transport study
Physical Review B(2023)
摘要
Te is a naturally p-doped semiconductor with a chiral structure, where an
electrical current causes the conduction electrons to become spin polarized
parallel to the transport direction. In this paper, we present a comprehensive
theoretical study of this effect by employing density functional theory (DFT)
combined with the non-equilibrium Green's functions (NEGF) technique for
quantum transport. We suggest that the spin polarization can quantitatively be
estimated in terms of two complementary quantities, namely the non-equilibrium
magnetic moments and the spin current density. The calculated magnetic moments
are directly compared with the values from previous theoretical studies
obtaining overall consistent results. On the other hand, the inspection of the
spin current density provides insights of the magnetotransport properties of
the material. Specifically, we predict that the resistance along a Te wire
changes when an external magnetic field is applied parallel or antiparallel to
the charge current direction. The computed magnetoresistance is however quite
small ( 0.025
spin polarization in terms of the spin current establishes a straightforward
connection with the phenomenon called chiral-induced spin selectivity, recently
observed in several nano-junctions.
更多查看译文
关键词
chiral tellurium,spin polarization,quantum,current-induced,first-principles
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要