TY  - JOUR
AU  - Storeck, G.
AU  - Rossnagel, K.
AU  - Ropers, C.
TI  - Ultrafast spot-profile LEED of a charge-density wave phase transition
JO  - Applied physics letters
VL  - 118
IS  - 22
SN  - 1077-3118
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - PUBDB-2021-02577
SP  - 221603 
PY  - 2021
AB  - We investigate the optically driven phase transition between two charge-density wave (CDW) states at the surface of tantalum disulfide(1T-TaS2). Specifically, we employ a recently improved ultrafast low-energy electron diffraction setup to study the transition from the nearlycommensurate to the incommensurate (IC) CDW state. The experimental setup allows us to follow transient changes in the diffraction pat-tern with high momentum resolution and 1-ps electron pulse duration. In particular, we trace the diffraction intensities and spot profiles ofthe crystal lattice, including main and CDW superstructure peaks, as well as the diffuse background. Harnessing the enhanced data quality ofthe instrumental upgrade, we follow the laser-induced transient disorder in the system and perform a spot-profile analysis that yields a sub-stantial IC-peak broadening for very short time scales followed by a prolonged spot narrowing.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000683586000001
DO  - DOI:10.1063/5.0052603
UR  - https://bib-pubdb1.desy.de/record/459473
ER  -