Spin-Splitting Transport in Narrow-Gap Heterojunction Narrow Wires

Kakegawa, Tomoyasu; Akabori, Masashi; Yamada, S.

doi:10.1007/s10948-005-3374-7

Cited by 2 publications

(2 citation statements)

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“…In narrow-gap semiconductor nanostructures such as InAs and In 1−x Ga x As quantum wells, the inversion asymmetry of the confining potential due to the presence of the heterojunction 5 results in the spin-orbit interaction ͑SOI͒, so that it leads to the spin splitting transport of the carriers in the absence of any applied magnetic field. 6 It is found that the SOI can be employed to generate the spin polarization in a T-shaped structure 7,8 and a pure spin current in a Y-shaped junction. 9 The spin precession [10][11][12] and spin Hall effect 13 have been investigated in quantum wires with SOI.…”

Section: Introductionmentioning

confidence: 99%

“…Correspondingly, advanced electronic devices, such as spin transistors 2 , spin waveguides 3 , spin filters 4 , etc., have been proposed. In narrow-gap semiconductor nanostructures such as InAs-and In 1−x Ga x As quantum wells, the inversion asymmetry of the confining potential due to the presence of the heterojunction 5 results in the spin-orbit interaction (SOI), so that it leads to the spin splitting transport of the carriers in the absence of any applied magnetic field 6 . It is found that the SOI can be employed to generate the spin polarization in a T-shaped structure 7,8 and a pure spin current in a Yshaped junction 9 .…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction

et al. 2007

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We investigate the enhancement of spin polarization in a quantum wire in the presence of a constriction and a spin-orbit coupling segment. It is shown that the spin-filtering effect is significantly heightened in comparison with the configuration without the constriction. It is understood in the studies that the constriction structure plays a critical role in enhancing the spin filtering by means of confining the incident electrons to occupy one channel only while the outgoing electrons occupy two channels. The enhancement of spin filtering has also been analyzed within the perturbation theory. Because the spin polarization arises mainly from the scattering between the constriction and the segment with spin-orbit coupling, the subband mixing induced by spin-orbit interaction in the scattering process and the inferences result in higher spin-filtering effect.

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