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Determinant quantum Monte Carlo study of exciton condensation in the bilayer Hubbard model

Publication date2013-12-16
First online date2013-12-16
Abstract

We studied the possibility of exciton condensation in a strongly correlated bilayer extended Hubbard model using Determinant Quantum Monte Carlo. To model both the onsite repulsion U and the interlayer interaction V we introduced a novel update scheme extending the standard Sherman-Morrison update. We observe that the sign problem increases dramatically with the inclusion of the interlayer interaction V, which prohibits at this stage a unequivocal conclusion regarding the presence of exciton condensation. However, enhancement of the interlayer tunneling results suggest that the strongest exciton condensation tendency lies around 10-20 % p/n-doping. Magnetic properties and conductivity turn out to be relatively independent of the interlayer interaction.

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Citation (ISO format)
RADEMAKER, Louk et al. Determinant quantum Monte Carlo study of exciton condensation in the bilayer Hubbard model. In: Physical review. B, Condensed matter and materials physics, 2013, vol. 88, n° 23, p. 235115. doi: 10.1103/PhysRevB.88.235115
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ISSN of the journal1098-0121
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