SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 15: Mini-Symposium: Ultrafast surface dynamics at the space-time limit II

O 15.3: Vortrag

Montag, 1. März 2021, 14:25–14:45, R1

Towards understanding the time evolution of metastable charge-ordered states — •Yaroslav A. Gerasimenko^1,2, Jan Ravnik^1,3, Jaka Vodeb¹, Michele Diego¹, Yevhenii Vaskivskyi¹, Viktor V. Kabanov¹, Igor Vaskivskyi⁴, Tomaz Mertelj^1,4, and Dragan Mihailovic^1,4,5 — ¹Jozef Stefan Institute, Ljubljana, Slovenia — ²University of Regensburg, Regensburg, Germany — ³Paul Scherrer Institute, Villigen, Switzerland — ⁴CENN Nanocenter, Ljubljana, Slovenia — ⁵University of Ljubljana, Ljubljana, Slovenia

Metastable self-organized electronic states in quantum materials are emergent states of matter[1] typically formed through phase transitions under non-equilibrium conditions. It is of fundamental importance to understand the process of their formation that can involve multiple mechanisms[1,2] spanning a large range of timescales.

Here we combine multiple techniques to map the evolution of metastable states in 1T-TaS₂, a prototypical charge-ordered quantum material, using the photon density and temperature as control parameters on timescales ranging from 10⁻¹² to 10³s. The combination of STM and in situ ultrafast excitation allows us to observe explicitly both parametric stability and nanoscale relaxation of the light-induced metastable states on the scale of seconds, while time-resolved optical techniques and electrical measurements allow us to study the ordering and relaxation processes down to a few picoseconds. [3]

[1] Ya. A. Gerasimenko et al., Nature Materials 18, 1078-1083 (2019)

[2] Ya. A. Gerasimenko et al., npj Quantum Materials 4, 1-9 (2019)

[3] J. Ravnik et al., arXiv:2011.00930