Collapse of layer dimerization in the photo-induced hidden state of 1T-TaS.

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ID: 99796
2020
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Abstract
Photo-induced switching between collective quantum states of matter is a fascinating rising field with exciting opportunities for novel technologies. Presently, very intensively studied examples in this regard are nanometer-thick single crystals of the layered material 1T-TaS, where picosecond laser pulses can trigger a fully reversible insulator-to-metal transition (IMT). This IMT is believed to be connected to the switching between metastable collective quantum states, but the microscopic nature of this so-called hidden quantum state remained largely elusive up to now. Here, we characterize the hidden quantum state of 1T-TaS by means of state-of-the-art x-ray diffraction and show that the laser-driven IMT involves a marked rearrangement of the charge and orbital order in the direction perpendicular to the TaS-layers. More specifically, we identify the collapse of interlayer molecular orbital dimers as a key mechanism for this non-thermal collective transition between two truly long-range ordered electronic crystals.
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stahl2020collapsenature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Stahl, Quirin;Kusch, Maximilian;Heinsch, Florian;Garbarino, Gaston;Kretzschmar, Norman;Hanff, Kerstin;Rossnagel, Kai;Geck, Jochen;Ritschel, Tobias;
Journal Nature communications
Year 2020
DOI
10.1038/s41467-020-15079-1
URL
Keywords
high pressure extreme conditions x-ray emission spectroscopy laser heating nuclear resonant inelastic scattering

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