Spin-Polarized-Current State of Electrons in Bilayer Graphene

Abstract

We propose a model of spin-polarized-current state for electrons in bilayer graphene. The model resolves the puzzles as revealed by experiments that (a) the energy gap $E_{\mathrm{gap}}$ of the insulating ground state at the charge neutrality point (CNP) can be closed by a perpendicular electric field of either polarity, (b) $E_{\mathrm{gap}}$ increases significantly with increasing the magnetic field $B$, (c) the particle-hole spectrum is asymmetric in the presence of $B$, (d) there is a peak structure in the electric conductivity at small $B$ at the CNP, and (e) there are quantum Hall states stemming from lifting of degeneracy in the lowest Landau level. The model predicts that the ground state of the system close to the CNP is a ferrimagnet at finite $B$ and the Hall current is spin polarized.

arXiv comment7 pages, 7 figures, PRB Rapid Communication, to be published

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Cited by in corpus (3)

• Emergent topological mirror insulator in t2g-orbital systems
• Current orderings of interacting electrons in bilayer graphene
• Phase boundary of spin-polarized-current state of electrons in bilayer graphene