Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-04
Phys. Rev. Lett. 101, 246404 (2008).
Physics
Condensed Matter
Strongly Correlated Electrons
(v2) A typo in Fig. 1 and a slight error in Eq. (4) corrected; all the main results and conclusions remain unchanged
Scientific paper
10.1103/PhysRevLett.101.246404
A real-space formulation is given for the recently discussed exciton condensate in a symmetrically biased graphene bilayer. We show that in the continuum limit an oddly-quantized vortex in this condensate binds exactly one zero mode per valley index of the bilayer. In the full lattice model the zero modes are split slightly due to intervalley mixing. We support these results by an exact numerical diagonalization of the lattice Hamiltonian. We also discuss the effect of the zero modes on the charge content of these vortices and deduce some of their interesting properties.
Franz Marcel
Seradjeh Babak
Weber Harald
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