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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3069
DTSTART:20131118T223000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T212156Z
LAST-MODIFIED:20131105T194546Z
LOCATION:Chamberlin 5310
SUMMARY:Tunnel-Fluctuoscopy:  Fluctuation Induced Low-Bias Anomaly\, C
 ondensed Matter Theory Group Seminar\, Andrey Varlamov\, CNR-SPIN\, Ro
 me\, Italy
DESCRIPTION:Electron tunneling spectroscopy pioneered by Esaki and Gia
 ever offers a powerful tool for studying electronic spectra in superco
 nductors. The phenomenological theory by Giaever and Megerle related t
 he tunneling current to the electronic densities of states and to the 
 difference of their equilibrium distribution functions in electrodes. 
 This led to impressive discoveries having revealed\, in particular\, o
 f the wide\, pseudogap in the tunneling spectrum of superconductors ab
 ove their critical temperatures. However\, it turns that this standard
  approach is insufficient to reveal the nontrivial\, related to Andree
 v reflection of the tunneling electrons from superconducting fluctuati
 on domains in the biased electrode\, zero-bias anomaly carrying import
 ant information about the scattering\, interactions\, and decoherence.
  Here\, operating in frameworks of the microscopic theory of tunneling
 \, we report the existence of a such low-energy singularity in a tunne
 ling conductivity of N-I-N(S) junction directly indicating on the pres
 ence of fluctuating Cooper pairs. Our findings mark a radical departur
 e from the conventional picture of the ZBA and open new horizons for q
 uantitative analysis of electronic spectra of superconductors in fluct
 uation regime.<br>
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URL:https://www.physics.wisc.edu/events/?id=3069
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