Measurements of Nonequilibrium Interatomic Forces in Photoexcited Bismuth

Autor:	Teitelbaum, Samuel W., Henighan, Thomas C., Liu, Hanzhe, Jiang, Mason P., Zhu, Diling, Chollet, Matthieu, Sato, Takahiro, Murray, ��amonn D., Fahy, Stephen, O'Mahony, Shane, Bailey, Trevor P., Uher, Ctirad, Trigo, Mariano, Reis, David A.
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	Condensed Matter::Materials Science Condensed Matter - Materials Science Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences
Popis:	We determine experimentally the excited-state interatomic forces in photoexcited bismuth. The forces are obtained by a constrained least-squares fit of the excited-state dispersion obtained by femtosecond time-resolved x-ray diffuse scattering to a fifteen-nearest neighbor Born-von Karman model. We find that the observed softening of the zone-center $A_{1g}$ optical mode and transverse acoustic modes with photoexcitation are primarily due to a weakening of three nearest neighbor forces along the bonding direction. This provides a more complete picture of what drives the partial reversal of the Peierls distortion previously observed in photoexcited bismuth. 6 pages, 3 figures, plus 3 pages, 3 figures of supplemental information
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ce4e198f3f81d767f52e9940ced008e http://arxiv.org/abs/1908.07161 Zobrazit plný text záznamu