Haldane phases with ultracold fermionic atoms in double-well optical lattices - Laboratoire de Physique Théorique - LPT Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2019

Haldane phases with ultracold fermionic atoms in double-well optical lattices

Résumé

We propose to realize one-dimensional topological phases protected by SU(N) symmetry using alkali or alkaline-earth atoms loaded into a bichromatic optical lattice. We derive a realistic model for this system and investigate it theoretically. Depending on the parity of N, two different classes of symmetry-protected topological (SPT) phases are stabilized at half-filling for physical parameters of the model. For even N, the celebrated spin-1 Haldane phase and its generalization to SU(N) are obtained with no local symmetry breaking. In stark contrast, at least for N=3, a new class of SPT phases, dubbed chiral Haldane phases, that spontaneously break inversion symmetry, emerges with a twofold ground-state degeneracy. The latter ground states with open-boundary conditions are characterized by different left and right boundary spins, which are related by conjugation. Our results show that topological phases are within close reach of the latest experiments on cold fermions in optical lattices.

Mots clés

Fichier principal
Vignette du fichier
Fromholz2019.pdf (1.1 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02058539 , version 1 (21-11-2019)

Identifiants

Citer

P. Fromholz, Sylvain Capponi, P. Lecheminant, David Papoular, K. Totsuka. Haldane phases with ultracold fermionic atoms in double-well optical lattices. Physical Review B, 2019, 99 (5), pp.054414. ⟨10.1103/PhysRevB.99.054414⟩. ⟨hal-02058539⟩
67 Consultations
100 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More