论文标题
拓扑磁电效应引起的FANO共振
Fano resonances induced by the topological magnetoelectric effect
论文作者
论文摘要
我们研究了拓扑绝缘子纳米颗粒与脉冲磁场中的量子点之间的相互作用。由于拓扑绝缘子是非磁性的，因此冲动仅结束了局部拓扑表面模式，该模式是根据偶极骨模式定量的，因此将偶性偶联到量子点。因此，混合系统可以视为与两级系统相互作用的单个纤维型模式，在该系统中，耦合强度是根据磁性极化性量化的。我们通过与辐射输出模式的连续储存和声子模式的储层实现混合与环境的相互作用。使用Zubarev的绿色函数方法，我们得出了系统光吸收光谱的表达式。我们发现Fano共振的出现是$ \ Mathbb {Z} _ {2} $不变拓扑绝缘子的直接表现。我们提供了由TLBISE $ _2 $与CDSE量子点相互作用的拓扑绝缘子纳米球的数值结果。
We investigate the interaction between a topological insulator nanoparticle and a quantum dot in an impulse magnetic field. Since topological insulators are nonmagnetic, after the impulse has ended only the localised topological surface modes, which are quantised in terms of dipolar bosonic modes, thus coupling dipolarly to the quantum dot. Hence, the hybrid system can be treated as a single bosonic mode interacting with a two-level system, where the coupling strength is quantised in terms of the magnetoelectric polarizability. We implement the interaction of the hybrid with the environment through the coupling with a continuum reservoir of radiative output modes and a reservoir of phonon modes. Using the method of Zubarev's Green functions, we derive an expression for the optical absorption spectrum of the system. We find the emergence of Fano resonances which are direct manifestations of the $\mathbb{Z}_{2}$ invariant of topological insulators. We present numerical results for a topological insulator nanosphere made of TlBiSe$_2$ interacting with a CdSe quantum dot.
