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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2196
DTSTART:20111021T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T231717Z
LAST-MODIFIED:20111014T133353Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:The Kondo effect: from magnetic alloys to nanoelectronics\, Ph
 ysics Department Colloquium\, Peter Wölfle\, Karlsruhe Institute of T
 echnology\, Germany
DESCRIPTION:After introducing the problem and some historical remarks 
 I show how the Kondo effect may be understood as a collective many-bod
 y effect\, present whenever a local degree of freedom (spin) is couple
 d to a continuum of excitations. A comparison with selected experiment
 s serves to highlight the essence of the Kondo effect. Then the Kondo 
 effect in quantum dots is introduced and salient features are reviewed
 . It is shown how the theory needs to be modified to account for noneq
 uilibrium transport through Kondo dots. Examples of how the Kondo effe
 ct is suppressed and how it may be created by finite bias voltage are 
 shown. Finally the role of the Kondo effect in creating "heavy electro
 n metals" is described and the fascinating physics of quantum phase tr
 ansitions in these compounds is highlighted.
URL:https://www.physics.wisc.edu/events/?id=2196
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