Photoinduced metallization of excitonic insulators
Ejima S, Lange F, Fehske H (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 105
Article Number: 245126
Journal Issue: 24
DOI: 10.1103/PhysRevB.105.245126
Abstract
Utilizing the time-dependent density-matrix renormalization-group technique, we numerically prove photoinduced pairing states in the extended Falicov-Kimball model (EFKM) at half-filling, both with and without internal SU(2) symmetry. In the time-dependent photoemission spectra, an extra band appears above the Fermi energy after pulse irradiation, indicating an insulator-to-metal transition. Even in the absence of the SU(2) structure, the pair correlations are enhanced during the pump, and afterwards they decrease over time. This implies the possible metallization of Ta2NiSe5, a strong candidate for an excitonic insulator material, for which the EFKM is considered to be the minimal theoretical model. Simulating the photoemission with optimized pulse parameters, we demonstrate a photoinduced quantum phase transition, in accord with recent findings in time- and angle-resolved photoemission spectroscopy experiments on Ta2NiSe5.
Involved external institutions
Germany (DE)How to cite
APA:
Ejima, S., Lange, F., & Fehske, H. (2022). Photoinduced metallization of excitonic insulators. Physical Review B, 105(24). https://dx.doi.org/10.1103/PhysRevB.105.245126
MLA:
Ejima, Satoshi, Florian Lange, and Holger Fehske. "Photoinduced metallization of excitonic insulators." Physical Review B 105.24 (2022).
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