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Strong interaction effects at a Fermi surface in a model for voltage-biased bilayer graphene

DOI: 10.1103/PhysRevB.92.235143 DOI Help

Authors: Wes Armour (University of Oxford, Diamond Light Source) , Simon Hands (Swansea University) , Costas Strouthos (European University Cyprus)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 92

State: Published (Approved)
Published: December 2015

Abstract: Monte Carlo simulation of a 2+1 dimensional model of voltage-biased bilayer graphene, consisting of relativistic fermions with chemical potential μ coupled to charged excitations with opposite sign on each layer, has exposed noncanonical scaling of bulk observables near a quantum critical point found at strong coupling. We present a calculation of the quasiparticle dispersion relation E(k) as a function of exciton source j in the same system, employing partially twisted boundary conditions to boost the number of available momentum modes. The Fermi momentum kF and superfluid gap are extracted in the j → 0 limit for three different values of μ, and support a strongly interacting scenario at the Fermi surface with ∼ O(μ). We propose an explanation for the observation μ<kF in terms of a dynamical critical exponent z < 1.

Subject Areas: Physics

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