g-factor anisotropy driven spin-relaxation in germanium

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 and this previously unobserved physics enables the extraction of spin lifetime solely from spin-valve measurements. We find spin lifetimes in Ge up to several hundreds of nanoseconds at low temperature, far beyond any other available experimental results. Such long spin lifetime in Ge is governed by the space inversion symmetry and time reversal symmetry of electrons near the Brillouin zone L-point.

Original languageEnglish (US)
Title of host publicationSpintronics VII
EditorsHenri-Jean Drouhin, Jean-Eric Wegrowe, Manijeh Razeghi
PublisherSPIE
ISBN (Electronic)9781628411942
DOIs
StatePublished - Jan 1 2014
EventSpintronics VII - San Diego, United States
Duration: Aug 17 2014Aug 21 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9167
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceSpintronics VII
CountryUnited States
CitySan Diego
Period8/17/148/21/14

Keywords

  • Anisotropy
  • G-factor
  • Germanium
  • Intervalley scattering
  • Spin lifetime
  • Spin relaxation
  • Spintronics

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