Two Phases of Monolayer Tantalum Sulfide on Au(111)

Daniela Dombrowski; Abdus Samad; Clifford Murray; Marin Petrović; Pascal Ewen; Thomas Michely; Marko Kralj; Udo Schwingenschlögl; Carsten Busse

doi:10.1021/acsnano.1c04249

Two Phases of Monolayer Tantalum Sulfide on Au(111)

ACS Nano. 2021 Aug 24;15(8):13516-13525. doi: 10.1021/acsnano.1c04249. Epub 2021 Jul 23.

Authors

Daniela Dombrowski^{1

2}, Abdus Samad³, Clifford Murray⁴, Marin Petrović⁵, Pascal Ewen¹, Thomas Michely⁴, Marko Kralj⁵, Udo Schwingenschlögl³, Carsten Busse^{1

2}

Affiliations

¹ Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
² Department Physik, Universität Siegen, 57068 Siegen, Germany.
³ King Abdullah University of Science and Technology, Physical Science and Engineering Division, 23955 Thuwal, Saudi Arabia.
⁴ II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany.
⁵ Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, 10000 Zagreb, Croatia.

PMID: 34296863
DOI: 10.1021/acsnano.1c04249

Abstract

We prepared monolayers of tantalum sulfide on Au(111) by evaporation of Ta in a reactive background of H₂S. Under sulfur-rich conditions, monolayers of 2H-TaS₂ formed, whereas under sulfur-poor conditions TaS_2-x with 0 ≤ x ≤ 1 were found. We identified this phase as TaS, a structure that can be derived from 2H-TaS₂ by removal of the bottom S layer.

Keywords: 2d materials; angle-resolved photoemission spectroscopy; density functional theory; monolayer transition-metal chalcogenide; scanning tunneling microscopy/spectroscopy; synthesis.