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SUMMARY:Heat Transport Measurements in Electronic Quantum Channels - Dr Ul
 f Gennser\, CNRS - Laboratory of Photonics and Nanostructures\, France
DTSTART:20140319T141500Z
DTEND:20140319T151500Z
UID:TALK51226@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:A number of recent experiments have demonstrated that heat tra
 nsport studies can reveal new insights into the physics of mesoscopic syst
 ems.  In particular\, they have revealed novel properties of edge state tr
 ansport and low-level energy excitations in quantum Hall systems\, where o
 therwise the robust quantization of Hall currents limits the amount of inf
 ormation that can be obtained from charge transport alone. In this talk\, 
 I will review some of these results\, including those obtained in our grou
 p. \n\nSpurred on by these findings\, we have been able to significantly i
 mprove our heat current measurements.  This has made it possible to measur
 e the thermal conductance quantum Gq for Fermi particles across a single e
 lectronic channel.  In contrast to charge transport\, Gq is predicted to b
 e independent of the type of particles carrying the heat. Such universalit
 y\, combined with the relationship between heat and information\, signals 
 a general limit on information transfer.  It was previously measured for B
 ose particles\, across the sixteen vibrational modes of narrow bridges.\nU
 sing noise thermometry and quantum point contacts in a 2D electron gas\, w
 e demonstrated an experimental agreement with the predicted value of Gq fo
 r electrons at an accuracy better than 10%. This establishes experimentall
 y this basic building block of quantum thermal transport and opens access 
 to new experiments involving the quantum manipulation of heat.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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