利用腔体内玻色格子气中的超辐射光操纵Goldstone模
Manipulating Goldstone modes via the superradiant light in a bosonic lattice gas inside a cavity
摘要：
本文研究了具有空穴相互作用的玻色格子气的低能激发。通过两次连续的Hubbard-Stratonovich变换，我们导出了研究强耦合区的有效场论。在考虑量子涨落的情况下，我们报道了超辐射腔光引起的密度不平衡的不寻常效应，这种效应在以前的研究中被证明对单粒子激发的影响可以忽略不计。相反，我们表明，这种可忽略的密度不平衡波动显着改变了低能激发的行为，并导致在其单粒子激发中两种类型的Goldstone模式之间的自由切换，即，I型和II型分别具有奇次和偶次能量-动量色散。我们的建议将打开一个新的视野操纵戈德斯通模式的桥梁腔光和强相互作用的量子物质。
英文摘要：
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.
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