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Title: Photoemission study of the electronic structure and charge density waves of Na₂Ti₂Sb₂O

The electronic structure of Na₂Ti₂Sb₂O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na₂Ti₂Sb₂O in the non-magnetic state, which indicates that there is no magnetic order in Na₂Ti₂Sb₂O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na₂Ti₂Sb₂O. Photon energy dependent ARPES results suggest that the electronic structure of Na₂Ti₂Sb₂O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na₂Ti₂Sb₂O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime. (author)
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [5] ;  [4] ;  [2] ;  [6] ;  [2]
  1. Science and Technology on Surface Physics and Chemistry Lab., Mianyang (China); Fundan Univ., Shanghai (China)
  2. Fundan Univ., Shanghai (China); Nanjing Univ., Nanjing (China)
  3. Fundan Univ., Shanghai (China)
  4. Rice Univ., Houston, TX (United States)
  5. Rice Univ., Houston, TX (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Science and Technology on Surface Physics and Chemistry Lab., Mianyang (China)
Publication Date:
OSTI Identifier:
1184847
Grant/Contract Number:
FG02-05ER46202
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: C; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE