论文标题
可调的手性结合状态在二聚体链链中
Tunable Chiral Bound States in a Dimer Chain of Coupled Resonators
论文作者
论文摘要
我们研究了一个由一个两级发射极（TLE）组成的系统和偶联谐振器的一维（1D）二聚体链和备用单光子能量的系统。在单启示子空间中，该系统不仅拥有两个具有传播状态的能带，而且还具有手性结合状态。手性结合状态的数量取决于TLE和二聚体链之间的耦合形式。发现当TLE局部耦合到二聚体链的一个谐振器时，具有镜面反射对称性的界限不是手性。当TLE非局部耦合到两个相邻的谐振器时，由于镜像对称性破裂而产生了三个手性结合状态。这些结合状态的手性可以通过改变相邻谐振器中单个光子的能量差，耦合强度和TLE的过渡能来调节。能量带之外的普通两个结合状态的手性行为与能量间隙内的新兴结合状态之一完全不同。由于完全破坏性的干扰，可以在某些参数上实现几乎完美的手性结合状态。
We study the chiral feature in a system composed of one two-level emitter (TLE) and a one dimensional (1D) dimer chain of coupled resonators with the alternate single-photon energies. In the single-excitation subspace, this system not only possesses two energy bands with propagating states, but also possesses chiral bound states. The number of chiral bound states depends on the coupling forms between the TLE and the dimer chain. It is found that when the TLE is locally coupled to one resonator of the dimer chain, the bound-state that has mirror reflection symmetry is not a chiral one. When the TLE is nonlocally coupled to two adjacent resonators, three chiral bound states arise due to the mirror symmetry breaking. The chirality of these bound states can be tuned by changing the energy differences of single photon in the adjacent resonators, the coupling strengths and the transition energy of the TLE. The chirality behaviour of the ordinary two bound states outside the energy bands is quite different from the one of the emerging bound state inside the energy gap. The almost perfect chiral bound states can be achieved at certain parameters as a result of completely destructive interference.
