Scanning tunnelling microscopy and spectroscopy investigation of rubidium-induced Mott–Hubbard transition on 1T–TaS2

The influence of rubidium deposition on structural and electronic properties of 1T–TaS2 was investigated by scanning tunnelling microscopy and spectroscopy at room temperature. The hexagonally ordered charge density wave (CDW) of the clean surface exhibits a rectangular symmetry upon rubidium adsorption. The spectroscopy data signals a Mott–Hubbard phase transition by an energy gap between upper and lower Hubbard bands giving rise to a Coulomb interaction energy of 1 eV. Owing to spatially resolved spectroscopy the energy gap can be directly related to the rectangular CDW phase. In addition, rubidium adsorption leads to the formation of a network of linear wires. Scanning tunnelling spectroscopy indicates that the wires are most likely not fabricated from rubidium.

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Published in:
New Journal of Physics
Publisher:
IOP Publishing
Publishing place:
[Bad Honnef]
[London]
Vol.:
10
No.:
1
ISSN:
1367-2630
Date Issued:
2008
URN:
urn:nbn:de:gbv:8:3-2026-00261-7
DOI:
10.1088/1367-2630/10/1/013022
Language:
English
Type of Resource:
Text
Keywords:
Rubidium deposition; 1T–TaS2; Scanning tunnelling microscopy; Scanning tunnelling spectroscopy; Charge density wave (CDW); Mott–Hubbard phase transition; Hubbard bands; Coulomb interaction; Energy gap; Linear wires
Classification:
Published version
DDC subject of DNB:
530 Physics
Hosting institution:
Faculties, Faculty of Mathematics and Natural Sciences

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