Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.037001
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Funding
- National Science Foundation (NSF) [DMR-1056527]
- Materials Interdisciplinary Research Team Grant [DMR-1122594]
- U.S. Department of Energy [DE-FG 02-04-ER-46157, DE-SC0012336]
- U.S. Department of Energy, Office of Basic Energy Sciences (DOE-BES) [DE-AC02-98CH10886]
- DOE-BES [DE-FG02-98ER45706]
- NSF [1066293]
- U.S. Department of Energy (DOE) [DE-SC0012336] Funding Source: U.S. Department of Energy (DOE)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1056527] Funding Source: National Science Foundation
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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.
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