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Title: Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects

Abstract

The effect of photoexcitation is studied for a system with checkerboard charge order induced by displacements of ligands around a metal site. The motion of the ligands is treated classically and the electronic charges are simplified to two-level molecular bond charges. The calculations are done for a checkerboard charge-ordered system with about 100 000 ligand oscillators coupled to a fixed-temperature bath. The initial photoexcitation is followed by a rapid decrease in the charge-order parameter within 50–100 femtoseconds while leaving the correlation length almost unchanged. Depending on the fluence, a complete melting of the charge order occurs in less than a picosecond. While for low fluences, the system returns to its original state, for full melting, it recovers to its broken-symmetry state leading to an inversion of the charge order. For small long-range interactions, recovery can be slow due to domain formation.

Authors:
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1338987
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

van Veenendaal, Michel. Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.115101.
van Veenendaal, Michel. Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects. United States. https://doi.org/10.1103/PhysRevB.94.115101
van Veenendaal, Michel. 2016. "Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects". United States. https://doi.org/10.1103/PhysRevB.94.115101.
@article{osti_1338987,
title = {Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects},
author = {van Veenendaal, Michel},
abstractNote = {The effect of photoexcitation is studied for a system with checkerboard charge order induced by displacements of ligands around a metal site. The motion of the ligands is treated classically and the electronic charges are simplified to two-level molecular bond charges. The calculations are done for a checkerboard charge-ordered system with about 100 000 ligand oscillators coupled to a fixed-temperature bath. The initial photoexcitation is followed by a rapid decrease in the charge-order parameter within 50–100 femtoseconds while leaving the correlation length almost unchanged. Depending on the fluence, a complete melting of the charge order occurs in less than a picosecond. While for low fluences, the system returns to its original state, for full melting, it recovers to its broken-symmetry state leading to an inversion of the charge order. For small long-range interactions, recovery can be slow due to domain formation.},
doi = {10.1103/PhysRevB.94.115101},
url = {https://www.osti.gov/biblio/1338987}, journal = {Physical Review B},
issn = {2469-9950},
number = 11,
volume = 94,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}