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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-8573
DTSTART:20240201T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260413T223411Z
LAST-MODIFIED:20240116T172529Z
LOCATION:5310 Chamberlin
SUMMARY:Dissipative mechanisms in SNS junctions and magnetic vortex la
 ttices\, R. G. Herb Condensed Matter Seminar\, Tony Liu\, U Washington
DESCRIPTION:In superconductors there is a mechanism of dissipation whi
 ch is related to the motion of quasiparticle energy levels and is simi
 lar to the Debye mechanism of microwave absorption in gases. The dissi
 pation rate associated with this Debye-like mechanism is controlled by
  the inelastic relaxation time\, and in some cases\, it can dominate c
 onventional dissipation mechanisms which are controlled by the elastic
  relaxation time. To illustrate this effect\, I will discuss the role 
 of this Debye-like mechanism in the I-V characteristics of SNS junctio
 ns as well as the microwave absorption of disordered magnetic vortex l
 attices. In the former\, I will show that there is a new regime at sma
 ll voltages/currents where the I-V characteristics are controlled enti
 rely by the density of states in the SNS junction and are characterize
 d by a large conductance proportional to the inelastic relaxation time
 . In the latter\,  I will show that the microwave absorption coefficie
 nt at small frequencies is similarly controlled by the inelastic relax
 ation time\, and that it is significantly larger than the value obtain
 ed in the conventional Bardeen-Stephen picture.
URL:https://www.physics.wisc.edu/events/?id=8573
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