Spin current swapping and Hanle spin Hall effect in a two-dimensional electron gas

被引:8
|
作者
Shen, Ka [1 ,2 ]
Raimondi, R. [3 ,4 ]
Vignale, G. [1 ]
机构
[1] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
[2] Delft Univ Technol, Kavli Inst NanoSci, NL-2628 CJ Delft, Netherlands
[3] Univ Rome Tre, CNISM, I-00146 Rome, Italy
[4] Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevB.92.035301
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We analyze the effect known as "spin current swapping" (SCS) due to electron-impurity scattering in a uniform spin-polarized two-dimensional electron gas. In this effect a primary spin current J(i)(a) (lower index for spatial direction, upper index for spin direction) generates a secondary spin current J(a)(i) if i not equal a, or J(j)(j) , with j not equal i, if i = a. Contrary to naive expectation, the homogeneous spin current associated with the uniform drift of the spin polarization in the electron gas does not generate a swapped spin current by the SCS mechanism. Nevertheless, a swapped spin current will be generated, if a magnetic field is present, by a completely different mechanism, namely, the precession of the spin Hall spin current in the magnetic field. We refer to this second mechanism as Hanle spin Hall effect, and we notice that it can be observed in an experiment in which a homogeneous drift current is passed through a uniformly magnetized electron gas. In contrast to this, we show that an unambiguous observation of SCS requires inhomogeneous spin currents, such as those that are associated with spin diffusion in a metal, and no magnetic field. An experimental setup for the observation of the SCS is therefore proposed.
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页数:7
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