Bipolarons bound by repulsive phonon-mediated interactions

John Sous, Mona Berciu, and Roman V. Krems
Phys. Rev. A 96, 063619 – Published 22 December 2017

Abstract

When dressed particles (polarons) exchange quantum phonons, the resulting interactions are generally attractive. If the particles have hard-core statistics and the coupling to phonons is through the kinetic energy terms, phonon-mediated interactions are repulsive. Here, we show that such repulsive phonon-mediated interactions bind dressed particles into bipolarons with unique properties. These bipolaron states appear in the gap between phonon excitations, above the two-polaron continuum. While thermodynamically unstable, the bipolaron is protected by energy and momentum conservation and represents a quasiparticle with a large dispersion and a negative effective mass near zero momentum. We discuss possible experimental implementation of the conditions for the formation of such repulsively bound bipolarons.

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  • Received 21 July 2017

DOI:https://doi.org/10.1103/PhysRevA.96.063619

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalGeneral PhysicsInterdisciplinary Physics

Authors & Affiliations

John Sous1,2,3, Mona Berciu2,3, and Roman V. Krems1

  • 1Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1
  • 3Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z4

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Issue

Vol. 96, Iss. 6 — December 2017

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