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.
| Original language | English |
|---|---|
| Article number | 085132 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 92 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2015 Aug 18 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Interplay of electron-electron and electron-phonon interactions in the low-temperature phase of 1T-TaS2. / Cho, Doohee; Cho, Yong Heum; Cheong, Sang Wook; Kim, Ki Seok; Yeom, Han Woong.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 8, 085132, 18.08.2015.Research output: Contribution to journal › Article
TY - JOUR
T1 - Interplay of electron-electron and electron-phonon interactions in the low-temperature phase of 1T-TaS2
AU - Cho, Doohee
AU - Cho, Yong Heum
AU - Cheong, Sang Wook
AU - Kim, Ki Seok
AU - Yeom, Han Woong
PY - 2015/8/18
Y1 - 2015/8/18
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.92.085132
DO - 10.1103/PhysRevB.92.085132
M3 - Article
AN - SCOPUS:84940055324
VL - 92
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 8
M1 - 085132
ER -