Manipulating Goldstone modes via the superradiant light in a bosonic lattice gas inside a cavity
| Autor: | Huan Wang, Shuai Li, Maksims Arzamasovs, W. Vincent Liu, Bo Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| DOI: | 10.48550/arxiv.2110.02434 |
| Popis: | We study the low-energy excitations of a bosonic lattice gas with cavity-mediated interactions. By performing two successive Hubbard-Stratonovich transformations, we derive an effective field theory to study the strongly-coupling regime. Taking into account the quantum fluctuation, we report the unusual effect of the superradiant cavity light induced density imbalance, which has been shown to have a negligible effect on the single particle excitation in the previous studies. Instead, we show that such negligible fluctuation of density imbalance dramatically changes the behavior of the low-energy excitation and results in a free switching between two types of Goldstone modes in its single particle excitation, i.e., type I and type II with odd and even power energy-momentum dispersion, respectively. Our proposal would open a new horizon for manipulating Goldstone modes from bridging the cavity light and strongly interacting quantum matters. Comment: 11 pages, 4 figures, including Supplementary Material |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|