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Time-of-flight spectroscopy via spin precession: The Larmor clock and anomalous spin dephasing in silicon
 

Summary: Time-of-flight spectroscopy via spin precession: The Larmor clock and anomalous
spin dephasing in silicon
Biqin Huang* and Ian Appelbaum
Center for Nanophysics and Advanced Materials and Department of Physics, University of Maryland,
College Park, Maryland 20742, USA
Received 12 November 2010; published 14 December 2010
Drift-diffusion theory--which fully describes charge transport in semiconductors--is also universally used
to model transport of spin-polarized electrons in the presence of longitudinal electric fields. By transforming
spin transit time into spin orientation with precession a technique called the "Larmor clock" in current-
sensing vertical-transport intrinsic Si devices, we show that spin diffusion and concomitant spin dephasing
can be greatly enhanced with respect to charge diffusion, in direct contrast to predictions of spin Coulomb-drag
diffusion suppression.
DOI: 10.1103/PhysRevB.82.241202 PACS number s : 72.25.Dc, 85.75. d
Observation of spin precession and dephasing is not only
clear evidence for nonequilibrium spin injection into non-
magnetic materials1,2
but it also provides a means to quanti-
tatively measure electron-transport dynamics.3 As shown re-
cently, spin precession measurements in a perpendicular
magnetic field can be used to directly derive the empirical

  

Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park

 

Collections: Engineering; Materials Science