We investigate the emergence of antiferromagnetic ordering and its effect on the helical edge states in a quantum spin Hall insulator, in the presence of strong Coulomb interaction. Using dynamical mean-field theory, we show that the breakdown of lattice translational symmetry favors the formation of magnetic ordering with nontrivial spatial modulation. The onset of a nonuniform magnetization enables the coexistence of spin-ordered and topologically nontrivial states. An unambiguous signature of the persistence of the topological bulk property is the survival of bona fide edge states. We show that the penetration of the magnetic order is accompanied by the progressive reconstruction of gapless states in subperipheral layers, redefining the actual topological boundary within the system.

Coexistence of metallic edge states and antiferromagnetic ordering in correlated topological insulators / Amaricci, A.; Valli, A.; Sangiovanni, G.; Trauzettel, B.; Capone, M.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 98:4(2018), pp. 1-6. [10.1103/PhysRevB.98.045133]

Coexistence of metallic edge states and antiferromagnetic ordering in correlated topological insulators

Amaricci, A.;Valli, A.;Sangiovanni, G.;Capone, M.
2018-01-01

Abstract

We investigate the emergence of antiferromagnetic ordering and its effect on the helical edge states in a quantum spin Hall insulator, in the presence of strong Coulomb interaction. Using dynamical mean-field theory, we show that the breakdown of lattice translational symmetry favors the formation of magnetic ordering with nontrivial spatial modulation. The onset of a nonuniform magnetization enables the coexistence of spin-ordered and topologically nontrivial states. An unambiguous signature of the persistence of the topological bulk property is the survival of bona fide edge states. We show that the penetration of the magnetic order is accompanied by the progressive reconstruction of gapless states in subperipheral layers, redefining the actual topological boundary within the system.
2018
98
4
1
6
045133
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.045133
https://arxiv.org/abs/1805.03999
Amaricci, A.; Valli, A.; Sangiovanni, G.; Trauzettel, B.; Capone, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/88208
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