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Proposal for a topological plasmon spin rectifier Ian Appelbaum,a
 

Summary: Proposal for a topological plasmon spin rectifier
Ian Appelbaum,a
H. D. Drew, and M. S. Fuhrer
Department of Physics and Center for Nanophysics and Advanced Materials, University of Maryland,
College Park, Maryland 20742, USA
Received 11 November 2010; accepted 21 December 2010; published online 10 January 2011
We propose a device in which the spin-polarized ac plasmon mode in the surface state of a
topological insulator nanostructure induces a static spin accumulation in a resonant, normal metal
structure coupled to it. Using a finite-difference time-domain model, we simulate this spin-pump
mechanism with drift, diffusion, relaxation, and precession in a magnetic field. This optically driven
system can serve as a dc "spin battery" for spintronic devices. 2011 American Institute of Physics.
doi:10.1063/1.3541545
The "topological insulator" TI is a class of strongly
spin-orbit-coupled materials with topologically protected,
chiral surface states of opposite group velocity and spin
crossing a bulk electronic gap.1
In these surface states, spin
and momentum are perfectly related, so that the momentum
asymmetry caused by an induced charge current necessarily
spin polarizes the system.

  

Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park
Fuhrer, Michael S - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park
Rubloff, Gary W. - Institute for Systems Research, University of Maryland at College Park

 

Collections: Engineering; Materials Science; Physics