Orbital order in bilayer graphene at filling factor $ν=-1 $

Details Orbital order in bilayer graphene at filling factor $ν=-1 $ Orbital order in bilayer graphene at filling factor $ν=-1 $

2010-03-29

arxiv.org/abs/1003.5679v1

Phys. Rev. B82, 035445 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

21 pages, 14 figures

Scientific paper

10.1103/PhysRevB.82.035445

In a graphene bilayer with Bernal stacking both $n=0$ and $n=1$ orbital Landau levels have zero kinetic energy. An electronic state in the N=0 Landau level consequently has three quantum numbers in addition to its guiding center label: its spin, its valley index $K$ or $K^{\prime}$, and an orbital quantum number $n=0,1.$ The two-dimensional electron gas (2DEG) in the bilayer supports a wide variety of broken-symmetry states in which the pseudospins associated these three quantum numbers order in a manner that is dependent on both filling factor $\nu $ and the electric potential difference between the layers. In this paper, we study the case of $\nu =-1$ in an external field strong enough to freeze electronic spins. We show that an electric potential difference between layers drives a series of transitions, starting from interlayer-coherent states (ICS) at small potentials and leading to orbitally coherent states (OCS) that are polarized in a single layer. Orbital pseudospins carry electric dipoles with orientations that are ordered in the OCS and have Dzyaloshinskii-Moriya interactions that can lead to spiral instabilities. We show that the microwave absorption spectra of ICSs, OCSs, and the mixed states that occur at intermediate potentials are sharply distinct.

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