Magnetoplasmons of the tilted anisotropic Dirac cone material α(BEDT-TTF)2I3

Judit Sári, Csaba Tőke, and Mark O. Goerbig
Phys. Rev. B 90, 155446 – Published 27 October 2014

Abstract

We study the collective modes of a low-energy continuum model of the quasi-two-dimensional electron liquid in a layer of the organic compound α(BEDT-TTF)2I3 in a perpendicular magnetic field. As testified by zero magnetic field transport experiments and ab initio theory, this material hosts both massless and massive low-energy carriers, the former being described by two tilted and anisotropic Dirac cones. The polarizability of these cones is anisotropic, and two sets of magnetoplasmon modes occur between any two cyclotron resonances. We show that the tilt of the cones causes a unique intervalley damping effect: the upper hybrid mode of one cone is damped by the particle-hole continuum of the other cone in generic directions. We analyze how the presence of massive carriers affects the response of the system, and demonstrate how doping can tune α(BEDT-TTF)2I3 between regimes of isotropic and anisotropic screening.

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  • Received 27 June 2014
  • Revised 8 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.155446

©2014 American Physical Society

Authors & Affiliations

Judit Sári1,2, Csaba Tőke2, and Mark O. Goerbig3

  • 1Institute of Physics, University of Pécs, H-7624 Pécs, Hungary
  • 2BME-MTA Exotic Quantum Phases “Lendület” Research Group, Budapest Univ. of Technology and Economics, Institute of Physics, Budafoki út 8., H-1111 Budapest, Hungary
  • 3Laboratoire de Physique des Solides, CNRS UMR 8502, Univ. Paris-Sud, F-91405 Orsay Cedex, France

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Issue

Vol. 90, Iss. 15 — 15 October 2014

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