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Quasiparticle interference, quasiparticle interactions, and the origin of the charge density wave in 2H-NbSe2

Author(s): Arguello, Carlos J.; Rosenthal, Ethan P.; Andrade, Erick F.; Jin, Wencan; Yeh, Pochun; et al

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Abstract: 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. © 2015 American Physical Society.
Publication Date: Jan-2015
Electronic Publication Date: 21-Jan-2015
Citation: Arguello, C.J., Rosenthal, E.P., Andrade, E.F., Jin, W., Yeh, P.C., Zaki, N., Jia, S., Cava, R.J., Fernandes, R.M., Millis, A.J., Valla, T., Osgood, R.M., Pasupathy, A.N. (2015). Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in. Physical Review Letters, 114 (3), 10.1103/PhysRevLett.114.037001
DOI: doi:10.1103/PhysRevLett.114.037001
ISSN: 0031-9007
EISSN: 1079-7114
Pages: 114.3:037001-1 - 037001-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Final published version. This is an open access article.
Notes: Physical Review Letters. Volume 114, Issue 3, 21 January 2015, Article number 037001.

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