Hall, J, Ehlen, N, Berges, J, van Loon, E, van Efferen, C, Murray, C, Rösner, M, Li, J, Senkovskiy, BV, Hell, M, Rolf, M, Heider, T, Asensio, MC, Avila, J, Plucinski, L, Wehling, T, Grüneis, A and Michely, T (2019). Environmental Control of Charge Density Wave Order in Monolayer 2H-TaS2. ACS Nano.

[img]
Preview
PDF
Hall-2019-Environmental-control-of-charge-density-wave-order-in-monolayer-TaS2.pdf - Accepted Version

Download (4MB) | Preview

Abstract

For quasi-freestanding 2H-TaS2 in monolayer thickness grown by in situ molecular beam epitaxy on graphene on Ir(111), we find unambiguous evidence for a charge density wave close to a 3x3 periodicity. Using scanning tunneling spectroscopy, we determine the magnitude of the partial charge density wave gap. Angle-resolved photoemission spectroscopy, complemented by scanning tunneling spectroscopy for the unoccupied states, makes a tight-binding fit for the band structure of the TaS2 monolayer possible. As hybridization with substrate bands is absent, the fit yields a precise value for the doping of the TaS2 layer. Additional Li doping shifts the charge density wave to a 2x2 periodicity. Unexpectedly, the bilayer of TaS2 also displays a disordered 2x2 charge density wave. Calculations of the phonon dispersions based on a combination of density-functional theory, density-functional perturbation theory, and many-body perturbation theory enable us to provide phase diagrams for the TaS2 charge density wave as functions of doping, hybridization and interlayer potentials, and offer insight into how they affect lattice dynamics and stability. Our theoretical considerations are consistent with the experimental work presented and shed light on previous experimental and theoretical investigations of related systems

Item Type: Journal Article
Creators:
CreatorsEmailORCID
Hall, JUNSPECIFIEDUNSPECIFIED
Ehlen, NUNSPECIFIEDUNSPECIFIED
Berges, JUNSPECIFIEDUNSPECIFIED
van Loon, EUNSPECIFIEDUNSPECIFIED
van Efferen, CUNSPECIFIEDUNSPECIFIED
Murray, CUNSPECIFIEDUNSPECIFIED
Rösner, MUNSPECIFIEDUNSPECIFIED
Li, JUNSPECIFIEDUNSPECIFIED
Senkovskiy, BVUNSPECIFIEDUNSPECIFIED
Hell, MUNSPECIFIEDUNSPECIFIED
Rolf, MUNSPECIFIEDUNSPECIFIED
Heider, TUNSPECIFIEDUNSPECIFIED
Asensio, MCUNSPECIFIEDUNSPECIFIED
Avila, JUNSPECIFIEDUNSPECIFIED
Plucinski, LUNSPECIFIEDUNSPECIFIED
Wehling, TUNSPECIFIEDUNSPECIFIED
Grüneis, AUNSPECIFIEDUNSPECIFIED
Michely, TUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-100194
DOI: 10.1021/acsnano.9b03419
Journal or Publication Title: ACS Nano
Subjects: Physics
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Institute of Physics II
Language: English
Date: 23 August 2019
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/10019

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item