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Add to Calendar 4/24/2019 11:00 am 4/24/2019 America/Chicago Institute for Condensed Matter Theory Seminar: "Quantized Thermoelectric Hall Effect and Zero-Field Nonlinear Hall Effect" DESCRIPTION:

I will describe two new Hall effects. First, I will show thermoelectric Hall conductivity, which relates transverse charge current to temperature gradient, is quantized in three-dimensional Dirac/Weyl materials in the quantum limit. The quantized value is independent of magnetic field, carrier density, or disorder. This quantization results from chiral Landau levels of Dirac/Weyl electrons and enables an unprecedented growth in the thermopower and the thermoelectric figure of merit. Second, I will demonstrate a novel nonlinear Hall effect in nonmagnetic materials at zero magnetic field, where the transverse current increases quadratically with applied electric field. This effect arises from Berry curvature in time-reversal-invariant inversion-breaking systems, which gives rise to anomalous velocity in a current-carrying state. Experimental observations and potential applications of thermoelectric Hall effect and nonlinear Hall effect will be discussed.

\n\nSPEAKER: Liang Fu, Massachusetts Institute of Technology
190 ESB false

Institute for Condensed Matter Theory Seminar: "Quantized Thermoelectric Hall Effect and Zero-Field Nonlinear Hall Effect"

Speaker Liang Fu, Massachusetts Institute of Technology
Date: 4/24/2019
Time: 11 a.m.
Location: 190 ESB
Sponsor: The Physics Department
Event Type: Seminar/Symposium
 

I will describe two new Hall effects. First, I will show thermoelectric Hall conductivity, which relates transverse charge current to temperature gradient, is quantized in three-dimensional Dirac/Weyl materials in the quantum limit. The quantized value is independent of magnetic field, carrier density, or disorder. This quantization results from chiral Landau levels of Dirac/Weyl electrons and enables an unprecedented growth in the thermopower and the thermoelectric figure of merit. Second, I will demonstrate a novel nonlinear Hall effect in nonmagnetic materials at zero magnetic field, where the transverse current increases quadratically with applied electric field. This effect arises from Berry curvature in time-reversal-invariant inversion-breaking systems, which gives rise to anomalous velocity in a current-carrying state. Experimental observations and potential applications of thermoelectric Hall effect and nonlinear Hall effect will be discussed.

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