Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A10: Driven Topological Systems - I
8:00 AM–11:00 AM,
Monday, March 4, 2024
Room: M100A
Sponsoring
Unit:
DCMP
Chair: Mainak Pal, University of Florida
Abstract: A10.00011 : Driving a topological insulator using a Gaussian pulse
10:00 AM–10:12 AM
Presenter:
Ranjani Seshadri
(Boston College)
Authors:
Ranjani Seshadri
(Boston College)
Tami Pereg-Barnea
(McGill Univ)
using Floquet theory and may result in generating topologically non-trivial phases in a system which was trivial to begin with.
However, in a real experiment that relies on pump-probe techniques to study materials, the external perturbation is never perfectly
periodic and has a pulse shape/envelope function. Using actual time-evolved states, we calculate the optical conductivity in presence
of such a drive and compare it to the response calculated using Floquet theory. The conductivity is found to bear a memory of the initial
equilibrium state. This hold even with a slow turning on of the pump and the measurement taken well after the ramp. The response of
the time-evolved system is interpreted as a result of the population of Floquet bands being determined by their overlap with the initial
equilibrium state. In particular, at band inversion points in the Brillouin zone the population of the Floquet bands is inverted as well.
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