Variational study of the interacting, spinless Su-Schrieffer-Heeger model

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buir.contributor.authorYahyavi, Mohammad
buir.contributor.authorSaleem, ‪Luqman
buir.contributor.authorHetényi, Balazs
dc.citation.epage445602-1en_US
dc.citation.issueNumber44en_US
dc.citation.spage445602-8en_US
dc.citation.volumeNumber30en_US
dc.contributor.authorYahyavi, Mohammaden_US
dc.contributor.authorSaleem, ‪Luqmanen_US
dc.contributor.authorHetényi, Balazsen_US
dc.date.accessioned2019-02-21T16:03:32Z
dc.date.available2019-02-21T16:03:32Z
dc.date.issued2018en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe study the phase diagram and the total polarization distribution of the Su-Schrieffer-Heeger model with nearest neighbor interaction in one dimension at half-filling. To obtain the ground state wave-function, we extend the Baeriswyl variational wave function to account for alternating hopping parameters. The ground state energies of the variational wave functions compare well to exact diagonalization results. For the case of uniform hopping for all bonds, where it is known that an ideal conductor to insulator transition takes place at finite interaction, we also find a transition at an interaction strength somewhat lower than the known value. The ideal conductor phase is a Fermi sea. The phase diagram in the whole parameter range shows a resemblance to the phase diagram of the Kane-Mele-Hubbard model. We also calculate the gauge invariant cumulants corresponding to the polarization (Zak phase) and use these to reconstruct the distribution of the polarization. We calculate the reconstructed polarization distribution along a path in parameter space which connects two points with opposite polarization in two ways. In one case we cross the metallic phase line, in the other, we go through only insulating states. In the former case, the average polarization changes discontinuously after passing through the metallic phase line, while in the latter the distribution 'walks across' smoothly from one polarization to its opposite. This state of affairs suggests that the correlation acts to break the chiral symmetry of the Su-Schrieffer-Heeger model, in the same way as it happens when a Rice-Mele onsite potential is turned on.
dc.description.sponsorshipThis research was supported by the National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program (Project Nr. 2017-1.2.1-NKP-2017-00001). BH thanks Balázs Dóra for helpful discussions.
dc.identifier.doi10.1088/1361-648X/aae0a4
dc.identifier.issn0953-8984
dc.identifier.urihttp://hdl.handle.net/11693/50114
dc.language.isoEnglish
dc.publisherInstitute of Physics Publishing
dc.relation.isversionofhttps://doi.org/10.1088/1361-648X/aae0a4
dc.relation.project2017-1.2.1-NKP-2017-00001
dc.source.titleJournal of Physics Condensed Matteren_US
dc.subjectCorrelated electronsen_US
dc.subjectOne-dimensional systemsen_US
dc.subjectTopological insulatorsen_US
dc.titleVariational study of the interacting, spinless Su-Schrieffer-Heeger modelen_US
dc.typeArticleen_US
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