Anisotropy-driven spin relaxation in germanium

Pengke Li, Jing Li, Lan Qing, Hanan Dery, Ian Appelbaum

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40 Scopus citations

Abstract

A unique spin depolarization mechanism, induced by the presence of g-factor anisotropy and intervalley scattering, is revealed by spin-transport measurements on long-distance germanium devices in a magnetic field longitudinal to the initial spin orientation. The confluence of electron-phonon scattering (leading to Elliott-Yafet spin flips) and this previously unobserved physics enables the extraction of spin lifetime solely from spin-valve measurements, without spin precession, and in a regime of substantial electric-field-generated carrier heating. We find spin lifetimes in Ge up to several hundreds of nanoseconds at low temperature, far beyond any other available experimental results.

Original languageEnglish (US)
Article number257204
JournalPhysical Review Letters
Volume111
Issue number25
DOIs
StatePublished - Dec 18 2013

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