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arXiv 1003.0606cond-mat.str-elcond-mat.mes-hall
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重费米子系统的内禀自旋和轨道霍尔效应

Intrinsic Spin and Orbital Hall Effects in Heavy Fermion Systems

Takuro Tanaka, Hirosho Kontani

摘要:

基于轨道简并周期Anderson模型研究了重费米子系统的内禀自旋霍尔效应。在极低电阻率区,本征自旋霍尔电导率(SHC)的大小估计为$2000 \sim 3000 \hbar e^{-1} Ω^{-1} cm^{-1}$,它是Pt的约10倍。在具有$f^1$($f^{13}$)组态的Ce(Yb)化合物体系中,它的符号为负(正)。有趣的是,所得到的SHC的表达式只依赖于传导电子的密度,但与c-f混合势的强度和质量增强因子无关。巨大的SHE的起源是由复杂的f轨道波函数诱导的自旋相关的Berry相,我们称之为“轨道Aharonov-Bohm效应”。

英文摘要:

We study the intrinsic spin Hall effect (SHE) based on the orbitally degenerate periodic Anderson model, which is an effective model for heavy fermion systems. In the very low resistivity regime, the magnitude of the intrinsic spin Hall conductivity (SHC) is estimated as $2000 \sim 3000 \hbar e^{-1} Ω^{-1} cm^{-1}$; It is about 10 times larger than that in Pt. Its sign is negative (positive) in Ce (Yb) compound systems with $f^1$ ($f^{13}$) configuration. Interestingly, the obtained expression for the SHC depends only on the density of conduction electrons, but is independent of the strength of the c-f mixing potential and the mass-enhancement factor. The origin of the huge SHE is the spin-dependent Berry phase induced by the complex f-orbital wavefunction, which we call the "orbital Aharonov-Bohm effect".

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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