Topological protection in non-Hermitian Haldane honeycomb lattices
Por:
Reséndiz-Vázquez P., Tschernig K., Perez-Leija A., Busch K., León-Montiel R.D.J.
Publicada:
1 ene 2020
Resumen:
Topological phenomena in non-Hermitian systems have recently become a subject of great interest in the photonics and condensed-matter communities. In particular, the possibility of observing topologically protected edge states in non-Hermitian lattices has sparked an intensive search for systems where this kind of states are sustained. Here we present a study of the emergence of topological edge states in two-dimensional Haldane lattices exhibiting balanced gain and loss. In line with recent studies on other Chern insulator models, we show that edge states can be observed in the so-called broken PT-symmetric phase, that is, when the spectrum of the gain-loss-balanced system's Hamiltonian is not entirely real. More importantly, we find that such topologically protected edge states emerge irrespective of the lattice boundaries, namely, zigzag, bearded, or armchair. © 2020 authors. Published by the American Physical Society.
Filiaciones:
Reséndiz-Vázquez P.:
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, Ciudad de México, 04510, Mexico
Tschernig K.:
Max-Born-Institut, Max-Born-Straße 2A, Berlin, 12489, Germany
Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik and Photonik, Berlin, D-12489, Germany
Perez-Leija A.:
Max-Born-Institut, Max-Born-Straße 2A, Berlin, 12489, Germany
Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik and Photonik, Berlin, D-12489, Germany
Busch K.:
Max-Born-Institut, Max-Born-Straße 2A, Berlin, 12489, Germany
Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik and Photonik, Berlin, D-12489, Germany
León-Montiel R.D.J.:
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, Ciudad de México, 04510, Mexico
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