Chiral symmetry breaking by a magnetic field in graphene

KANDEMİR B. S., MOĞULKOÇ A.

PHYSICS LETTERS A, cilt.379, sa.36, ss.2120-2124, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 379 Sayı: 36
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.physleta.2015.06.057
  • Dergi Adı: PHYSICS LETTERS A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2120-2124
  • Ankara Üniversitesi Adresli: Evet

Özet

We report a novel many-body mechanism for the chiral symmetry breaking in the lowest Landau levels (LLs) of graphene, which is responsible for the new quantum Hall states near the charge neutral Dirac points corresponding to nu = +/- 1 plateaus observed in magnetotransport measurements (Zhang et al., 2006 [31], Jiang et al., 2007 [32]). We show that, when a uniform magnetic field is switched on, valley symmetry breaking emerges in graphene due the interaction of electrons with zone-boundary phonons having A(1g)-symmetry. The induced valley gap is about 14.68 K k(B) root B(T) whose magnitude and field dependence are compatible with the observed quantum Hall plateaus in graphene. (C) 2015 Elsevier B.V. All rights reserved.