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TT: Fachverband Tiefe Temperaturen

TT 61: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)

TT 61.3: Vortrag

Donnerstag, 19. März 2020, 15:30–15:45, HSZ 201

Ultrafast jamming transition in a charge-ordered system — •Yaroslav Gerasimenko^1,2, Jaka Vodeb¹, Jan Ravnik¹, Igor Vaskivskyi¹, Michele Diego¹, Viktor Kabanov¹, and Dragan Mihailoivic^1,2 — ¹Jozef Stefan Institute, Ljubljana, Slovenia — ²CENN Nanocenter, Ljubljana, Slovenia

The combination of STM and in situ ultrafast excitation allows us to explore novel states of matter that can emerge from many-body interactions under highly non-equilibrium conditions. Most of such states are reminiscent of the nearby equilibrium ones. Here we show that a single femtosecond-scale optical pulse, applied to the prototypical transition metal dichalcogenide 1T-TaS2, can convert a perfect hexagonal charge order into a dramatically different metastable jammed state of strongly correlated electrons [1]. The mechanism for its formation is attributed to a dynamical localization of electrons through mutual interactions in absence of atomic disroder. We further build the phase diagaram of this transition as a function of fluence and temperature on multiple timescales. The time evolution of the localized charge pattern together with theoretical calculations [1, 2] confirm that charge order frustration is important for the state’s unusual stability.
The work was supported by ARRS P1-0040 and ERC AdG "Trajectory".

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

[2] J. Vodeb et al., New J. Phys. 21, 083001 (2019)