Document Type
Article
Publication Date
9-22-2020
Abstract
We establish a connection between quantum phase transitions (QPTs) and energy band theory in an extended Dicke-Hubbard lattice, where the periodical critical curves modulated by wave number k leads to rich equilibrium dynamics. Interestingly, the chiral-symmetry-protected flat band and the localization that it engenders exclusively occurs in the normal phase and disappears in the superradiant phase. This originates from the QPT induced simultaneous breaking up of the on-site resonance condition and off-site chiral symmetry of the system, which prohibits the destructive interference for obtaining a flat band. Our work offers an approach to identify different phases of the lattice via detecting the flat bands or simply the related localizations in a single cell, and, in turn, to control the appearance of flat bands by QPT.
Recommended Citation
Zhu, Gui-Lei, Hamidreza Ramezani, Clive Emary, Jin-Hua Gao, Ying Wu, and Xin-You Lü. 2020. “Interplay of Quantum Phase Transition and Flat Band in Hybrid Lattices.” Physical Review Research 2 (3): 033463. https://doi.org/10.1103/PhysRevResearch.2.033463.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Publication Title
Physical Review Research
DOI
10.1103/PhysRevResearch.2.033463
Comments
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.