Fig. 1: Overview of the experiment.
From: Revealing the electronic structure of the current-induced metastable state in 1T-TaS2
a Schematic description of the experiment: A 1T-TaS2 flake is cut into a rectangular shape and mounted on a sapphire substrate. By attaching contacts on each side one is able to apply current pulses or measure transport across the device while at the same time, the electronic structure can be probed with angle-resolved photoemission spectroscopy (ARPES). b Schematic illustration of the commensurate charge-density wave (CCDW) real-space structure. The star-of-David (SD) clusters are formed by 13 Ta atoms, the charge-density wave (CDW) distortion indicated by the red arrows. c, d Schematic cartoon of the real space structure of CCDW (c) and metallic mosaic state (d). Different colors indicate different domains. e Measured resistance across the device in the pristine CCDW state at 12 K (I), after switching into the metastable state by application of multiple current pulses (II) as well as after heating to 90 K and cooling back down to 12 K (III). f, g Constant energy contours in the kx-ky plane for different binding energies in the CCDW (f) and the metastable (g) state, respectively. The Brillouin zone (BZ) of the unreconstructed normal state, as well as the CCDW state, is superimposed in black and gray lines, respectively. High symmetry points of the normal state BZ zone are indicated in green. Exemplary momentum region of a CCDW-induced gap is highlighted by red arrows.
