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Title: Quasiparticle interference, quasiparticle interactions, and the origin of the charge density wave in 2HNbSe2

We show that a small number of intentionally introduced defects can be used as a spectroscopic tool to amplify quasiparticle interference in 2H-NbSe₂ that we measure by scanning tunneling spectroscopic imaging. We show, from the momentum and energy dependence of the quasiparticle interference, that Fermi surface nesting is inconsequential to charge density wave formation in 2H-NbSe₂. We demonstrate that, by combining quasiparticle interference data with additional knowledge of the quasiparticle band structure from angle resolved photoemission measurements, one can extract the wave vector and energy dependence of the important electronic scattering processes thereby obtaining direct information both about the fermiology and the interactions. In 2H-NbSe₂, we use this combination to confirm that the important near-Fermi-surface electronic physics is dominated by the coupling of the quasiparticles to soft mode phonons at a wave vector different from the charge density wave ordering wave vector.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [1]
  1. Columbia Univ., New York, NY (United States)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Columbia Univ., New York, NY (United States); Princeton Univ., Princeton, NJ (United States)
Publication Date:
OSTI Identifier:
1182502
Report Number(s):
BNL-107408-2015-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: PO016; KC0202020
Grant/Contract Number:
SC00112704; FG 02-04-ER-46157; FG02-98ER45706; SC0012336; AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 3; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY