Superconductivity with intrinsic topological order induced by pure Coulomb interaction and time-reversal symmetry breaking
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Tang-2013-Superconductivity with intrinsic.pdf
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Author(s)
Wen, Xiao-Gang
Tang, Evelyn May Yin
Date Issued
November 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Tang, Evelyn, and Xiao-Gang Wen. “Superconductivity with Intrinsic Topological Order Induced by Pure Coulomb Interaction and Time-Reversal Symmetry Breaking.” Phys. Rev. B 88, no. 19 (November 2013). © 2013 American Physical Society
Version
Final published version
Abstract
Recently, in certain flat band lattice systems at commensurate fillings, fractional quantum Hall states have been found, which have anyonic excitations. We study such systems away from commensuration, i.e., the ground state of an anyon gas in such a system. The presence of the underlying lattice allows access to an entirely new regime where the anyon kinetic energy can be larger than their interaction energy. Within the flux-attachment approach, using a mean field and then adding fluctuations, we find several possible superfluid states. Two have intrinsic topological order: fractionalized quasiparticles with a fusion structure of (Z[subscript 2])[superscript 4] and (Z[subscript 8])[superscript 2], respectively, and a third has no fractionalized excitations similar to a BCS-type state. This represents a mechanism for superconductivity driven purely by strong repulsion and complex hopping of electrons.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.88.195117
