Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F70: Light-Induced Structural Control of Electronic Phases I
8:00 AM–10:48 AM,
Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -Jackson Park B
Sponsoring
Units:
DMP DCMP
Chair: Michael Fechner, Max Planck Institute for the Structure and Dynamics of Matter
Abstract: F70.00011 : Structural dynamics in atomic wire systems at surfaces studied by ultrafast-electron diffraction: Excitation, metastable states and relaxation*
10:24 AM–10:36 AM
Presenter:
Michael Horn von Hoegen
(Duisburg-Essen University, Department of Physics)
Author:
Michael Horn von Hoegen
(Duisburg-Essen University, Department of Physics)
Transient heating of the In atoms from 30 to 60 K occurs delayed at 6 ps [Struct.Dyn.5,025101(2018)]: transition is driven by electronic entropy and not thermally. An energy barrier for the atoms collective motion from the (4×1) to the (8×2) hinders the immediate recovery of the ground state: the system remains for ns in a super cooled metastable (4×1) state inaccessible under equilibrium conditions. Relaxation into the (8×2) ground state happens through nucleation of the (8×2) at pre-existing defects like adsorbates [PRL109,186101(2012), PRL111,149602(2013)] or step edges triggering a recrystallization front propagating at a speed of ~100 m/s [Struct.Dyn.6,045101(2019)].
*Funding from DFG through CRC1242 is acknowledged
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