论文标题
合成Andreev频段中拓扑接口状态的参数扩增
Parametric amplification of topological interface states in synthetic Andreev bands
论文作者
论文摘要
驱动的非线性光子系统（例如，激子 - 孔子）可以在宽大的超流体状态下运行。从理论上讲，我们证明了线性波在此超流体上的反射是超导体上电子的Andreev反射的类似物。发现一个被两个超氟包围的正常区域可容纳Andreev样状态。这些结合状态形成了拓扑合成带与两个超流体之间的相位差。更改正常区域的宽度允许颠倒频段拓扑并创建“接口”状态。合成条带没有展示线性交叉，而是被骨系统的非线性非热性偶联吸引，从而引起了自我扩增的强烈占据的拓扑状态。
A driven-dissipative nonlinear photonic system (e.g. exciton-polaritons) can operate in a gapped superfluid regime. We theoretically demonstrate that the reflection of a linear wave on this superfluid is an analogue of the Andreev reflection of an electron on a superconductor. A normal region surrounded by two superfluids is found to host Andreev-like bound states. These bound states form topological synthetic bands versus the phase difference between the two superfluids. Changing the width of the normal region allows to invert the band topology and to create "interface" states. Instead of demonstrating a linear crossing, synthetic bands are attracted by the non-linear non-Hermitian coupling of bosonic systems which gives rise to a self-amplified strongly occupied topological state.
