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DTSTART:20070311T020000
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DTSTAMP:20241016T131220
DTSTART;TZID=America/Detroit:20241023T130000
DTEND;TZID=America/Detroit:20241023T140000
SUMMARY:Workshop / Seminar:Interdisciplinary QC-CM Seminar | Johnson Noise Thermometry Using Ohmic and Hydrodynamic Electrons
DESCRIPTION:Current through a resistor exhibits temperature-dependent white noise fluctuations called Johnson-Nyquist noise. For a 2D electron system\, measuring the magnitude of these fluctuations provides a direct measurement of the electron temperature and enables methods for inferring specific heat and thermal conductivity. Here I show how to understand Johnson noise both for electrons whose flow is dictated by Ohm's law and for electrons whose flow is hydrodynamic. I then discuss experimental results from the group of Philip Kim\, which use Johnson noise measurements to demonstrate a novel method for inferring specific heat and thermal conductivity for arbitrary materials and quasiparticle excitations. Experiments in the  Corbino geometry also reveal a novel\, qualitative signature of hydrodynamic flow without the need for nonlocal measurements.
UID:127921-21859931@events.umich.edu
URL:https://events.umich.edu/event/127921
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,Science
LOCATION:West Hall - 340
CONTACT:
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