Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 51: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)
MA 51.3: Vortrag
Donnerstag, 19. März 2020, 15:30–15:45, HSZ 201
Ultrafast jamming transition in a charge-ordered system — •Yaroslav Gerasimenko1,2, Jaka Vodeb1, Jan Ravnik1, Igor Vaskivskyi1, Michele Diego1, Viktor Kabanov1, and Dragan Mihailoivic1,2 — 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)