Interplay of electron-electron and electron-phonon interactions in the low-temperature phase of 1T-TaS2
SCIE
SCOPUS
- Title
- Interplay of electron-electron and electron-phonon interactions in the low-temperature phase of 1T-TaS2
- Authors
- Cho, D; Cho, YH; Cheong, SW; Kim, KS; Yeom, HW
- Date Issued
- 2015-08-18
- Publisher
- AMER PHYSICAL SOC
- Abstract
- We investigate the interplay of the electron-electron and electron-phonon interactions in the electronic structure of an exotic insulating state in the layered dichalcogenide 1T-TaS2, where the charge-density-wave (CDW) order coexists with a Mott correlation gap. Scanning tunneling microscopy and spectroscopy measurements with high spatial and energy resolution determine unambiguously the CDW and the Mott gap as 0.20-0.24 eV and 0.32 eV, respectively, through the real space electron phases measured across the multiply formed energy gaps. An unusual local reduction of the Mott gap is observed on the defect site, which indicates the renormalization of the on-site Coulomb interaction by the electron-phonon coupling as predicted by the Hubbard-Holstein model. The Mott-gap renormalization provides insight into the disorder-induced quasimetallic phases of 1T-TaS2.
- Keywords
- CHARGE-DENSITY WAVES; SCANNING TUNNELING SPECTROSCOPY; METAL-INSULATOR-TRANSITION; STATE; GAP
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35542
- DOI
- 10.1103/PHYSREVB.92.085132
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 92, no. 8, 2015-08-18
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.