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TT: Fachverband Tiefe Temperaturen
TT 12: New Experimental Techniques
TT 12.3: Vortrag
Mittwoch, 29. September 2021, 10:30–10:45, H7
Towards time domain phase diagram of metastable charge-ordered states — •Yaroslav Gerasimenko1,2, Jan Ravnik1,3, Jaka Vodeb1, Michele Diego1, Yevhenii Vaskivskyi1, Viktor Kabanov1, Igor Vaskivskyi1, Tomaz Mertelj1, and Dragan Mihailovic1 — 1Jozef Stefan Institute, Ljubljana, Slovenia — 2University of Regensburg, Regensburg, Germany — 3PSI, Villigen, Switzerland
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 103 s. 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., Nat. Mater. 18, 1078-1083 (2019)
[2] Ya. A. Gerasimenko et al., npj Quantum Materials 4, 1-9 (2019)
[3] J. Ravnik et al., Nat. Comm. 12, 2323 (2021)