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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-6848
DTSTART:20220222T160000Z
DTEND:20220222T170000Z
DTSTAMP:20260414T113403Z
LAST-MODIFIED:20220202T171946Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Embarking on a Thermal Journey in Low Dimensions with a 21st c
 entury thermometer: Graphene Nonlocal Noise\, R. G. Herb Condensed Mat
 ter Seminar\, Jonah Waissman\, Harvard University
DESCRIPTION:Low-dimensional materials\, such as 2D monolayers\, 1D nan
 owires\, and 0D quantum dots and molecules\, are rich with many-body q
 uantum phenomena. The reduced dimensionality\, strong interactions\, a
 nd topological effects lead to new emergent degrees of freedom of fund
 amental interest and promise for future applications\, such as energy-
 efficient computation and quantum information. Thermal transport\, whi
 ch is sensitive to all energy-carrying degrees of freedom and their in
 teractions\, provides a discriminating probe to identify these emergen
 t excitations. However\, thermal measurement in low dimensions is domi
 nated by lattice contributions\, requiring an approach to isolate the 
 electronic thermal conductance. In this talk\, I will discuss how the 
 measurement of nonlocal voltage fluctuations in a multiterminal device
  can reveal the electronic heat transported across a mesoscopic\, low-
 dimensional bridge. We use 2D graphene as an electronic noise thermome
 ter\, demonstrating quantitative electronic thermal conductance measur
 ement over a wide temperature range in an array of dimensionalities: 2
 D graphene\, 1D nanotubes\, 0D localized electron chains\, and 3D\, mi
 croscale bulk materials. I will discuss ongoing work revealing electro
 n hydrodynamics\, interaction-mediated plasmon hopping\, spin waves in
  a magnetic insulator\, and an electron-phonon crossover in a bulk spi
 n liquid candidate material.
URL:https://www.physics.wisc.edu/events/?id=6848
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