Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A32: Nonequilibrium Dynamics in the Solid State
8:00 AM–11:12 AM,
Monday, March 6, 2023
Room: Room 224
Sponsoring
Unit:
DCMP
Chair: Yicheng Zhang, University of Oklahoma
Abstract: A32.00002 : Nonequilibrium dynamics in pumped excitonic insulators*
8:12 AM–8:24 AM
Presenter:
Satoshi Ejima
(Quantumcomputing-Intiative (DLR))
Author:
Satoshi Ejima
(Quantumcomputing-Intiative (DLR))
In (quasi-)one dimension, such nonequilibrium dynamics can be simulated by the time-dependent density-matrix renormalization group technique with so-called infinite boundary conditions. In this talk, we demonstrate a photoinduced metallization of excitonic insulators by applying this unbiased numerical technique to the extended Falicov-Kimball model (EFKM) both with and without the internal SU(2) structure. In the SU(2)-symmetric case, an extra band appears above Fermi energy after pulse irradiation, reflecting the enhanced electron-electron pair correlations. Even in the absence of the SU(2) structure, the pair correlations can be enhanced transiently by optimizing the pump parameters. This implies the possible metallization of Ta2NiSe5, a strong candidate for an excitonic insulator, whose minimal model is considered to be the EFKM without internal SU(2) symmetry. This photoinduced insulator-to-metal transition reflects recent findings in time-resolved photoemission spectroscopy experiments on Ta2NiSe5.
*S. Ejima was supported by Deutsche Forschungsgemeinschaft through project EJ 7/2-1.
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