论文标题
开放的两级非温和部系统中的非常规的稳态和拓扑阶段
Unconventional steady states and topological phases in an open two-level non-Hermitian system
论文作者
论文摘要
破坏性和非热性是开放量子系统的两个不同效果。他们俩都触发了许多有趣的现象。在本文中，我们从理论上研究了通过求解矢量化的lindblad方程来研究开放式两级非休假系统与耗散环境的耦合。该方案为我们提供了一个有力的框架，可以通过增益，损失和耗散来解决广泛的开放系统。我们的结果表明，由于非热性和逆转之间的相互作用，存在一类新的特殊点（EP）和稳态。此外，我们还展示了特征值零的特征态的新型拓扑特性（$ re re [λ] = 0 $），这些特性对应于Fermi Arcs。据透露，位于费米（Fermi Arcs）体制中的特征状态的阶段具有拓扑阶段$ |π/2 | $，这完全不受耗散环境的影响。我们的结果提供了一种有希望的方法，可以进一步揭示和理解非热门开放系统的有趣特性。
Decoherence and non-Hermiticity are two different effects of the open quantum systems. Both of them have triggered many interesting phenomena. In this paper, we theoretically study an open two-level non-Hermitian system coupling to a dissipative environment by solving the vectorized Lindblad equation. This scheme provides us a powerful framework to address widespread open systems with gain, loss and dissipation. Our results show that there exist a new class of exceptional points (EPs) and steady states due to the interplay between non-Hermiticity and decoherence. Furthermore, we also demonstrate new-type topological properties of eigenstates with zero real-part of eigenvalues ($Re[λ]=0$) which are corresponding to Fermi arcs. It is revealed that the phases of eigenstates located in Fermi arcs regime have a topological phase $|π/2|$ which is totally unaffected by the dissipative environment. Our results provide a promising approach for further uncovering and understanding the intriguing properties of non-Hermitian open systems.
