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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1388
DTSTART:20090205T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260311T043507Z
LAST-MODIFIED:20090112T142518Z
LOCATION:5310 Chamberlin
SUMMARY:Probing Electron Energy Distribution in Carbon Nanotubes\, R. 
 G. Herb Condensed Matter Seminar\, Yung-Fu Chen\, Frederick Seitz Mate
 rials Research Lab\, UIUC
DESCRIPTION:Carbon nanotubes are considered model one-dimensional syst
 ems\, and their electronic transport is strongly affected by electron-
 electron (e-e) interactions. Measurements of the non-equilibrium elect
 ron energy distribution function in nanotubes may directly determine e
 lectron energy relaxation rates\, which may also tell us e-e scatterin
 g rates and therefore something about e-e interactions in nanotubes. W
 e developed techniques to perform tunneling spectroscopy on nanotubes 
 using non-invasive superconducting probes\, which allows us to measure
  the shape of the electron energy distribution locally in nanotubes th
 at have bias voltages applied between their ends to drive the electron
 s out of equilibrium. We find that at low temperatures electrons in na
 notubes maintain their energy distribution across a few microns channe
 l length. Surprisingly\, the energy relaxation rate sometimes grows su
 bstantially when the temperature is raised to only 1.5 K. 
URL:https://www.physics.wisc.edu/events/?id=1388
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