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

Journal Article · · Physical Review Letters
 [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)

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. Thus, 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 wavevector 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 show 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 CDW ordering wave vector.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1182502
Alternate ID(s):
OSTI ID: 1181309
Report Number(s):
BNL--107408-2015-JA; KC0202020
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 114; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Glassy Dynamics in a heavy ion irradiated NbSe2 crystal text January 2018
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How stimulation frequency and intensity impact on the long-lasting effects of coordinated reset stimulation posted_content September 2017
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