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DTSTAMP:20260406T024030Z
UID:1631538000@ist.ac.at
DTSTART:20210913T150000
DTEND:20210913T160000
DESCRIPTION:Speaker: Brad Ramshaw\nhosted by Kimberly Modic\nAbstract: Cert
 ain quantities in nature are bounded at a fundamental level. For example\
 , nothing can travel faster than the speed of light\, and Heisenberg's unc
 ertainty principle limits how precisely an object's position and momentum 
 can be specified. These bounds motivate new discoveries and serve as guard
 rails when making predictions. Recently\, it was conjectured that there is
  a fundamental bound on how often electrons can collide with each other in
  a metal\, with the collision rate set by Planck's constant. This "Plancki
 an" bound\, if it were shown to be true\, would unify our understanding of
  a host of seemingly-disparate systems\, including high-temperature superc
 onductors and twisted bilayer graphene\, and even connect their properties
  to the physics of black holes. The difficulty has been finding experiment
 al proof for this conjecture. We have developed a new technique for measur
 ing electron scattering rates and found that the Planckian bound not only 
 holds\, but it holds in a way that was entirely unexpected: it is independ
 ent of the electron's momentum. I will review the history of how this boun
 d came to be proposed\, what we have learned so far\, and what still needs
  to be resolved to establish the Planckian bound as a fact grounded both i
 n experiment and in theory.G. Grissonnanche et al. Linear-in temperature
  resistivity from an isotropic Planckian scattering rate (https://idp.natu
 re.com/authorize/casa?redirect_uri=https://www.nature.com/articles/s41586-
 021-03697-8&casa_token=SZ1F50PfJBkAAAAA:Y7A-P1Wr1fq4_Hl5ytJXWKw8Eq_96af16P
 p36trp6yKtfVVXXxSN635eOTSI4N478W9may3NnepQmw)\, Nature 595\, 667-672 (2021
 )
LOCATION:Online\, ISTA
ORGANIZER:isabella.riedler@ist.ac.at
SUMMARY:Brad Ramshaw: Institute Colloquium: Brad Ramshaw (Cornell Universit
 y)
URL:https://talks-calendar.ista.ac.at/events/3233
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