Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 96: Focus Session: Surface Transport at the Atomic Scale
O 96.8: Vortrag
Freitag, 5. April 2019, 12:45–13:00, H15
Exploring the unjamming of electrons with a multi-probe STM — •Yaroslav Gerasimenko1,2, Michele Diego2, Jan Ravnik2, and Dragan Mihailovic1,2 — 1CENN Nanocenter, Jamova 39, 1000, Ljubljana, Slovenia — 2Department of Complex Matter, Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
The combination of a multi-probe STM and an in situ ultrafast excitation allows us to explore novel states of matter that can emerge from many-body interactions under highly non-equilibrium conditions. 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 an exotic metastable amorphous jammed state of strongly correlated electrons [1].
Tunnelling spectra and four-probe surface transport measurements reveal a remarkable duality of localized and itinerant charges in this state. While the latter are predominantly responsible for hopping conductivity, the potential landscape is provided by the former ones. As the jammed state starts to relax at higher temperatures, consecutive STM images reveal the onset of the diffusion of the previously localised charges. By matching it with the multi-probe resistivity measurements, we identify a highly unusual dynamical regime in the surface transport.
[1] Ya. A. Gerasimenko, I. Vaskivskyi, J. Ravnik, J. Vodeb, V. Kabanov, D. Mihailovic, Quantum jamming transition to a correlated electron glass in 1T-TaS2, arXiv:1803.00255 (2018)