publication . Article . Other literature type . Preprint . 2015

Electric field-induced valley degeneracy lifting in uniaxial strained graphene: Evidence from magnetophonon resonance

Assili, Mohamed; Haddad, Sonia; Kang, Woun;
Open Access
  • Published: 18 Mar 2015 Journal: Physical Review B, volume 91 (issn: 1098-0121, eissn: 1550-235X, Copyright policy)
  • Publisher: American Physical Society (APS)
Abstract
A double peak structure in the magneto-phonon resonance (MPR) spectrum of uniaxial strained graphene, under crossed electric and magnetic fields, is predicted. We focus on the $\Gamma$ point optical phonon modes coupled to the inter-Landau level transitions $0 \leftrightarrows \pm 1$ where MPR is expected to be more pronounced at high magnetic field. We derive the frequency shifts and the broadenings of the longitudinal (LO) and transverse (TO) optical phonon modes taking into account the effect of the strain modified electronic spectrum on the electron-phonon coupling. We show that the MPR lines acquire a double resonance structure originating from the two-fold...
Subjects
arXiv: Condensed Matter::Materials Science
free text keywords: Magnetic field, Dirac (video compression format), Electric field, Landau quantization, Condensed matter physics, Physics, Phonon, Resonance, Graphene, law.invention, law, Coupling, Nuclear magnetic resonance, Condensed Matter - Mesoscale and Nanoscale Physics
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