Spin nutation and polarization in ballistic semiconductor nanostructures

Cho, Sam Young (2008) Spin nutation and polarization in ballistic semiconductor nanostructures. Physical Review B, 77 24: Article Number: 245326. doi:10.1103/PhysRevB.77.245326

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Author Cho, Sam Young
Title Spin nutation and polarization in ballistic semiconductor nanostructures
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2008-06-30
Sub-type Article (original research)
DOI 10.1103/PhysRevB.77.245326
Open Access Status File (Publisher version)
Volume 77
Issue 24
Start page Article Number: 245326
Total pages 7
Editor P.D. Adams
Place of publication College Park, Maryland, USA
Publisher American Physical Society
Collection year 2009
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
020499 Condensed Matter Physics not elsewhere classified
Abstract The definitions of spin orientation and polarization vectors are introduced within the particle density matrix of scattering states in leads. It is shown that spin-density vector can be defined by the product of the spin orientation vector, being a unit direction vector, and the charge density, corresponding to the amplitude of the spin-density vector, experimentally observable by a spatial charge modulation measurement. When an electron transports through a ballistic semiconductor nanostructure, due to quantum interference of two spin eigenmodes, the electron spin generally undergoes nutation on its precession around the effective magnetic field resulting from spin-orbit interactions. The nutation of electron spin is found to be crucial for spin polarization in the quantum transport. When one of two spin-dependent channels in leads is evanescent, electron spin is shown to be fully polarized for distance from the interface larger than the spin precession length.
Keyword ballistic transport
nanostructured materials
quantum interference phenomena
semiconductor materials
spin dynamics
spin polarised transport
spin-orbit interactions
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Fri, 20 Mar 2009, 12:37:11 EST by Jo Hughes on behalf of School of Mathematics & Physics