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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1298
DTSTART:20090326T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T055336Z
LAST-MODIFIED:20090128T142837Z
LOCATION:5310 Chamberlin
SUMMARY:What can we learn from spin-dependent shot noise in semiconduc
 tor and graphene nanostructures?\, R. G. Herb Condensed Matter Seminar
 \, Branislav Nikolic\, University of Delaware
DESCRIPTION:I review recent studies of the shot noise of spin-polarize
 d charge currents and pure spin currents in  multiterminal semiconduct
 or nanostructures with spin-orbit couplings or zigzag graphene nanorib
 bons attached to metallic electrodes. Akin to early utilization of noi
 se in mesoscopic devices\, where random time-dependent current fluctua
 tions contain much more information about the transport than revealed 
 through average current and conductance\, spin-dependent shot noise em
 erges as a rich electrical tool to probe spin as magnetic degree of fr
 eedom. The Fano factor (noise-to-current ratio) of such noise can quan
 tify decoherence of transported spins\, or reveal the origin of the sp
 in Hall effect (SHE) in simply-connected devices and probe interferenc
 e effects in SHE induction in multiply-connected Aharonov-Casher rings
 . Finally\, while the conventional spin-degenerate shot noise has very
  recently become important experimental tool to study ballistic transp
 ort through evanescent modes in graphene samples attached to metallic 
 electrodes\, in ribbons with zigzag edges which favor edge magnetic or
 dering when Coulomb interaction is &quot\;turned on&quot\;\, modificat
 ion of the shot noise can be exploited to detect this unusual form of 
 low-dimensional carbon-based magnetism.
URL:https://www.physics.wisc.edu/events/?id=1298
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