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SUMMARY:Pro-QM Zeminar
DTSTART:20230621T193000Z
DTEND:20230621T203000Z
DTSTAMP:20260907T003900Z
UID:indico-event-3798@indico.flatironinstitute.org
DESCRIPTION:We will be holding a virtual Pro-QM Zeminar this week on W
 ed. 6/21 at 3:30pm ET. Our speaker will be Dr. Tobias Holder from the Weiz
 mann Institute (https://scholar.google.com/citations?user=xfDidrkAAAAJ&hl=
 en) Speaker: Tobias Holder Title: Unique transport signatures in magneti
 c materials: Connecting semiclassics and quantum perturbation theory at no
 nlinear order Abstract: In the last few years\, nonlinear responses have 
 become increasingly important for the study and characterization of quantu
 m materials\, with the nonlinear anomalous Hall conductivity and the bulk 
 photovoltaic effect being particularly successful examples. At the same ti
 me\, from a theory perspective nonlinear response is challenging for two r
 easons: Firstly\, the corresponding expressions are often unwieldy\, and s
 econdly many of the physical intuitions acquired at linear order seem to f
 ail beyond linear order. Hence\, for decades several key aspects of nonlin
 ear transport have remained controversial. In this talk\, I will present a
  new framework which connects the concepts of anomalous motion\, coherent 
 interband transitions\, and wavepacket deformations. I show in which cases
  the Green-Kubo formalism can be continued to zero frequency to recover th
 e Boltzmann kinetic approach and discuss two novel phenomena in the nonlin
 ear conductivity: The appearance of a mixed axial-gravitational anomaly in
  magnetic metals and a nonlinear quantum anomalous Hall effect in certain 
 magnetic insulators. [2208.00827\,2209.09531]The seminar will be held vi
 rtually over Zoom:https://columbiauniversity.zoom.us/j/97171267603?pwd=U2w
 rVEUrbkhOV0NSOUdOeDZhK2d3Zz09Meeting ID: 971 7126 7603Passcode: 897903\n\n
 https://indico.flatironinstitute.org/event/3798/
LOCATION:virtual
URL:https://indico.flatironinstitute.org/event/3798/
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