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Time Reversal Symmetric Topological Exciton Condensate in Bilayer HgTe Quantum Wells
Stockholm University, Faculty of Science, Department of Physics. University of Innsbruck, Austria.
Number of Authors: 3
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 14, 146405- p.Article in journal (Refereed) Published
Abstract [en]

We investigate a bilayer system of critical HgTe quantum wells, each featuring a spin-degenerate pair of massless Dirac fermions. In the presence of an electrostatic interlayer Coulomb coupling, we determine the exciton condensate order parameter of the system self-consistently. Calculating the bulk topological Z(2) invariant of the resulting mean-field Hamiltonian, we discover a novel time reversal symmetric topological exciton condensate state, coined the helical topological exciton condensate. We argue that this phase can exist for experimentally relevant parameters. Interestingly, due to its multiband nature, the present bilayer model exhibits a nontrivial interplay between spontaneous symmetry breaking and topology: Depending on which symmetry the condensate order parameter spontaneously picks in combined orbital and spin space, stable minima in the free energy corresponding to both trivial and nontrivial gapped states can be found.

Place, publisher, year, edition, pages
2014. Vol. 112, no 14, 146405- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-105229DOI: 10.1103/PhysRevLett.112.146405ISI: 000335860800018OAI: oai:DiVA.org:su-105229DiVA: diva2:731868
Funder
Swedish Research Council
Note

AuthorCount:3;

Available from: 2014-07-02 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved

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