Odd-frequency pair density wave in the Kitaev-Kondo lattice model

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dc.creatorCarvalho, Vanuildo Silva de
dc.creatorTeixeira, Rafael M. P.
dc.creatorSilva, Hermann Freire Ferreira Lima e
dc.creatorMiranda, Eduardo
dc.date.accessioned2023-05-31T14:56:58Z
dc.date.available2023-05-31T14:56:58Z
dc.date.issued2021
dc.description.abstractWe investigate the properties of the Kitaev-Kondo lattice model defined on a bilayer honeycomb lattice by means of the SO(3) Majorana representation for spin-1/2 moments. We first consider the pairing of neighboring sites for the parent Kitaev spin-liquid (KSL) Hamiltonian to render the Majorana and the spin-1/2 Hilbert spaces perfectly equivalent to each other. As a consequence, we demonstrate that this decoupling of the Kitaev interaction in terms of the SO(3) Majorana fermions reproduces exactly the spectrum of the KSL model alone. Then, by considering the effect of a local Kondo coupling JK in the model and decoupling it in terms of an order parameter that physically must have a finite staggering phase, we obtain that the system undergoes a quantum phase transition from a fractionalized Fermi liquid to a nematic triplet superconducting (SC) phase as JK is increased. Depending on the model parameters, this SC phase can exhibit either Dirac points, Bogoliubov-Fermi lines, or Bogoliubov-Fermi surfaces as nodal bulk manifolds. The surface states in this latter case are also characterized by topologically protected antichiral edge modes. The SC phase breaks time-reversal symmetry and exhibits a coexistence of a dominant odd-frequency pairing with a small even-frequency component for electronic excitations localized on sites of the same sublattice of the system. Finally, we show that this SC phase is in fact a pair-density-wave state, with Cooper pairs possessing a finite center-of-mass momentum in zero magnetic fieldpt_BR
dc.identifier.citationCARVALHO, Vanuildo S. de; TEIXEIRA, Rafael M. P. ; FREIRE, Hermann; MIRANDA, Eduardo. Odd-frequency pair density wave in the Kitaev-Kondo lattice model. Physical Review B, College Park, v. 103, p. 174512, 2021. DOI: 10.1103/PhysRevB.103.174512. Disponível em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.174512. Acesso em: 31 maio 2023.pt_BR
dc.identifier.doi10.1103/PhysRevB.103.174512
dc.identifier.issn1098-0121
dc.identifier.issne- 1550-235X
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/22657
dc.language.isoengpt_BR
dc.publisher.countryEstados unidospt_BR
dc.publisher.departmentInstituto de Física - IF (RMG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleOdd-frequency pair density wave in the Kitaev-Kondo lattice modelpt_BR
dc.typeArtigopt_BR

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