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arXiv 2003.09277cond-mat.mes-hallphysics.optics
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光子对的相互作用诱导拓扑态

Interaction-induced topological states of photon pairs

Andrei A. Stepanenko, Maxim A. Gorlach

摘要:

迄今为止,拓扑序的概念在很大程度上依赖于单粒子能带的性质。直到最近人们才意识到,相互作用可以对拓扑性质产生巨大的影响,不仅可以修改能带的拓扑结构,还可以在一个原本微不足道的系统中创建拓扑秩序。应用玻色-哈伯德模型的一个扩展版本,我们研究了一个系统,其中,拓扑平凡的单粒子制度,窝藏拓扑非平凡的边缘和排斥束缚光子对的界面态。而在这个模型中的光子的绑定被捕获的标准本地相互作用项,一个额外的直接双光子跳跃呈现系统拓扑非平凡的。除了它们的相互作用引起的起源,预测的双光子边缘状态表现出一系列其他意想不到的功能,包括相应的体带的崩溃的鲁棒性和共存的能力与连续的双光子散射状态形成一个束缚态的连续。通过严格计算束缚光子对的Zak相位,证明了双光子边缘态的拓扑起源。

英文摘要:

To date, the concept of topological order relies heavily on the properties of single-particle bands. Only recently it has been realized that interactions can have a dramatic impact on topological properties not only modifying the topology of the bands but also creating a topological order in an otherwise trivial system. Applying an extended version of the Bose-Hubbard model, we investigate a system which, being topologically trivial in the single-particle regime, harbors topologically nontrivial edge and interface states of repulsively bound photon pairs. Whereas binding of the photons in this model is captured by a standard local interaction term, an additional direct two-photon hopping renders the system topologically non-trivial. Besides their interaction-induced origin, predicted two-photon edge states exhibit a range of other unexpected features, including the robustness to collapse of the corresponding bulk band and the ability to coexist with the continuum of two-photon scattering states forming a bound state in the continuum. Performing rigorous calculation of the Zak phase for bound photon pairs, we prove the topological origin of the two-photon edge states.

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