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Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in 2HNbSe2

C. J. Arguello, E. P. Rosenthal, E. F. Andrade, W. Jin, P. C. Yeh, N. Zaki, S. Jia, R. J. Cava, R. M. Fernandes, A. J. Millis, T. Valla, R. M. Osgood, Jr., and A. N. Pasupathy
Phys. Rev. Lett. 114, 037001 – Published 21 January 2015
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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 2HNbSe2 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 2HNbSe2. 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 2HNbSe2, 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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  • Received 19 August 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.037001

© 2015 American Physical Society

Authors & Affiliations

C. J. Arguello1, E. P. Rosenthal1, E. F. Andrade1, W. Jin2, P. C. Yeh2, N. Zaki3, S. Jia4, R. J. Cava4, R. M. Fernandes5, A. J. Millis1, T. Valla6, R. M. Osgood, Jr.3,4, and A. N. Pasupathy1

  • 1Department of Physics, Columbia University, New York, New York 10027, USA
  • 2Department of Applied Physics and Applied Math, Columbia University, New York, New York 10027, USA
  • 3Department of Electrical Engineering, Columbia University, New York, New York 10027, USA
  • 4Department of Chemistry, Princeton University, Princeton, New Jersey 08540, USA
  • 5School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 6Brookhaven National Laboratory, Upton, New York 11973, USA

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Issue

Vol. 114, Iss. 3 — 23 January 2015

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