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. Finally, for small long-range interactions, recovery can be slow due to domain formation.
- Authors:
-
- Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1338243
- Alternate Identifier(s):
- OSTI ID: 1314343
- Grant/Contract Number:
- AC02-06CH11357; FG02-03ER46097; FG02-08ER46540; SC0007091
- Resource Type:
- Accepted Manuscript
- 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. Thu .
"Photoinduced ultrafast charge-order melting: Charge-order inversion and nonthermal effects". United States. https://doi.org/10.1103/PhysRevB.94.115101. https://www.osti.gov/servlets/purl/1338243.
@article{osti_1338243,
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. Finally, for small long-range interactions, recovery can be slow due to domain formation.},
doi = {10.1103/PhysRevB.94.115101},
journal = {Physical Review B},
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}
}
Web of Science
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