BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1215
DTSTART:20081009T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T200519Z
LAST-MODIFIED:20081002T154438Z
LOCATION:Chamberlin 5310
SUMMARY:Magnetotransport in Microwave-irradiated Quantum Hall Systems\
 , R. G. Herb Condensed Matter Seminar\, Michael Zudov\, University of 
 Minnesota
DESCRIPTION:When a high quality two-dimensional electron system is irr
 adiated by microwaves\, its magnetoresistance exhibits microwave-induc
 ed resistance oscillations (MIRO) and zero-resistance states. MIRO wer
 e discussed in terms of the aEurooedisplacementaEuro model\, which is 
 based on microwave-assisted impurity scattering\, and the aEurooeinela
 sticaEuro model\, stepping from the oscillatory electron distribution 
 function. It is believed that the aEurooeinelasticaEuro contribution g
 reatly exceeds the aEurooedisplacementaEuro contribution and can also 
 account for MIRO temperature dependence.<br>
\n<br>
\nThis talk will d
 iscuss our recent experiments focusing on non-linear response and temp
 erature dependence of MIRO. First\, we show that the aEuro~aEuroTMdisp
 lacementaEuroTMaEuroTM mechanism cannot be ignored and might even domi
 nate the response under typical experimental conditions. Further\, we 
 find that the MIRO temperature dependence originates primarily from th
 e temperature-dependent quantum lifetime entering the Dingle factor. W
 e suggest that the main source of the modification of the quantum scat
 tering rate is the contribution from electron-electron scattering\, a 
 quantity hardly available from other experiments.
URL:https://www.physics.wisc.edu/events/?id=1215
END:VEVENT
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