Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M52: Surface Studies of Transition Metal Dichalcogenides
11:15 AM–2:15 PM,
Wednesday, March 4, 2020
Room: Mile High Ballroom 1E
Sponsoring Unit: DCMP
Chair: Daniel Dougherty, North Carolina State University
Abstract: M52.00003 : Mottness versus unit-cell doubling as the driver of the insulating state in 1T-TaS2
View Presentation Abstract
(Department of Applied Physics, The University of Tokyo)
We will describe scanning tunneling microscopy measurements  showing two distinct terminations of the 3D charge order - the sign of a stacking pattern with two SDs per cell - and determine the inter-layer stacking vectors. We argue that the persistence of a spectral gap even at the surface which breaks the SD dimers is a manifestation of Mottness. We also identify a stacking vector, extrinsic to the natural pattern, which renders the surface metallic. These results help to understand this material's mysterious insulating state, and its potentially useful metal-insulator transitions.
 T. Ritschel, H. Berger and J. Geck, PRB 98, 195134 (2018).
 S.-H. Lee, J. S. Goh and D. Cho, PRL 122, 106404 (2019).
 C. J. Butler, M. Yoshida, T. Hanaguri and Y. Iwasa, arXiv:1908.08221
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