Interplay of quantum phase transition and flat band in hybrid lattices
Quantum Physics
2020-09-30 v2
Abstract
We investigate the interplay of superradiant phase transition (SPT) and energy band physics in an extended Dicke-Hubbard lattice whose unit cell consists of a Dicke model coupled to an atomless cavity. We found in such a periodic lattice the critical point that occurs in a single Dicke model becomes a critical region that is periodically changing with the wavenumber . In the weak-coupling normal phase of the system we observed a flat band and its corresponding localization that can be controlled by the ground-state SPT. Our work builds the connection between flat band physics and SPT, which may fundamentally broaden the regimes of many-body theory and quantum optics.
Keywords
Cite
@article{arxiv.1910.00747,
title = {Interplay of quantum phase transition and flat band in hybrid lattices},
author = {Gui-Lei Zhu and Hamidreza Ramezani and Clive Emary and Jin-Hua Gao and Ying Wu and Xin-You Lü},
journal= {arXiv preprint arXiv:1910.00747},
year = {2020}
}
Comments
9 pages, 5 figures, published version