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Title: | Topological triple phase transition in non-Hermitian quasicrystals with complex asymmetric hopping |
Authors: | Bandyopadhyay, Jayendra N. |
Keywords: | Physics Asymmetric hopping Non-Hermitian quasicrystals |
Issue Date: | Jul-2023 |
Publisher: | APS |
Abstract: | The triple phase transitions or simultaneous transitions of three different phases, namely, topological, parity-time (PT) symmetry breaking, and metal-insulator transitions, are observed in an extension of the PT symmetric non-Hermitian Aubry-André-Harper model. In this model, besides the non-Hermitian complex quasiperiodic on-site potential, non-Hermiticity is also included in the nearest-neighbor hopping terms. Moreover, the nearest-neighbor hopping terms are also quasiperiodic. The presence of two non-Hermitian parameters, one from the on-site potential and another one from the hopping part, ensures PT symmetry transition in the system. In addition, tuning these two non-Hermitian parameters, we identify a parameters regime, where we observe the triple phase transition. Following some recent studies, an electrical circuit based experimental realization of this model is also discussed. |
URI: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.108.014204 http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/14192 |
Appears in Collections: | Department of Physics |
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