Pattern Formation and Exotic Order in Driven-Dissipative Bose-Hubbard Systems
Pattern Formation and Exotic Order in Driven-Dissipative Bose-Hubbard Systems
复制标题
驱动耗散 Bose-Hubbard 系统中的模式形成和奇异顺序
DOI：
10.1103/physrevlett.125.115301
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发表时间：
2020
影响因子：
8.6
通讯作者：
Cai Zi
中科院分区：
文献类型：
--
作者：
Wang Zijian;Navarrete-Benlloch Carlos;Cai Zi
现代实验平台，如超导电路阵列，要求探索玻色子紧束缚模型在非常规情况下，没有对应的真实的材料。在这里，我们调查这样的情况下，激发驱动和阻尼对，导致图案的形成和异国情调的玻色子态出现的非平衡量子多体系统。研究了一个二维驱动耗散玻色-哈伯德模型，发现其定态的特征是玻色粒子在固体系统中费米面的玻色模拟物“玻色面”上的动量周围凝聚.驱动产生的不稳定性之间的相互作用，非线性耗散模式耦合，和潜在的晶格效应允许系统平衡到一个异国情调的超流态的玻色子凝聚在一个封闭的环上的动量空间，而不是离散点。这种具有空间均匀密度分布的非常规状态超出了传统的图案形成范围，因此在经典文献中没有对应物。此外，它是一个与现代凝聚态物理学中几个悬而未决的问题有关的状态。在这里，我们提供了稳定它的方法，开辟了实验研究的道路。此外，我们还提供了一个具体的实验实现我们的模型在目前可用的超导电路阵列。我们还研究了凝聚体周围的弛豫谱，这表明了一个典型的纯扩散行为。
Modern experimental platforms such as superconducting circuit arrays call for the exploration of bosonic tight-binding models in unconventional situations with no counterpart in real materials. Here we investigate one such situation in which excitations are driven and damped by pairs, leading to pattern formation and exotic bosonic states emerging from a nonequilibrium quantum many-body system. Focusing on a two-dimensional driven-dissipative Bose-Hubbard model, we find that its steady states are characterized by the condensation of bosons around momenta lying on a “Bose surface,” a bosonic analog of the Fermi surface in solid-state systems. The interplay between instabilities generated by the driving, the nonlinear dissipative mode coupling, and the underlying lattice effect allows the system to equilibrate into an exotic superfluid state of bosons condensed on a closed ring in momentum space instead of discrete points. Such an unconventional state with a spatially uniform density distribution goes beyond the traditional scope of pattern formation and thus has no counterpart in the classical literature. In addition, it is a state connected to several open problems in modern condensed-matter physics. Here we provide the means to stabilize it, opening the way to its experimental study. Moreover, we also provide a concrete experimental implementation of our model in currently available superconducting circuit arrays. We also investigate the relaxation spectrum around the condensate, which shows a characteristic purely diffusive behavior.