Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.257204
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Funding
- Maryland NanoCenter
- FabLab.
- University of Maryland by the Office of Naval Research [N000141110637]
- National Science Foundation [ECCS-0901941, ECCS-1231855]
- Defense Threat Reduction Agency [HDTRA1-13-1-0013]
- NSF [DMR-1124601, ECCS-1231570]
- DTRA [HDTRA1-13-1-0013]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1124601] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1231570, 1231855] Funding Source: National Science Foundation
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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.
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