Physics - The Anthony J Leggett Institute for Condensed Matter Theory Seminar

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The Anthony J Leggett Institute for Condensed Matter Physics Seminar: "Topo-photovoltaics"

Event Type
Seminar/Symposium
Sponsor
Physics Department
Location
ESB 190
Date
Nov 4, 2024   12:00 pm  
Speaker
Aris Alexandradinata, University of California Santa Cruz
Contact
Stephen Bullwinkel
E-Mail
bullwink@illinois.edu
Phone
217-333-1652
Views
80

In non-centrosymmetric materials, light induces real-space shifts of quasiparticles which result in a photovoltaic current. Such shifts arise from all dynamical, far-from-equilibrium, kinetic processes, including photo-excitation, intraband relaxation and interband recombination. These shifts are enhanced by the twisting of electronic wavefunctions in momentum space; such twisting is characterized by the well-known intra-band Berry phase and the less-known inter-band Berry phase. Wave-function-enhanced photovoltaic currents can be utilized as an unprecedented phenomenological framework to faithfully diagnose topological materials, as I will exemplify with BiTeI.

 

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