扭曲同质双层异质结构中的强关联激子-极化子
Strongly correlated exciton-polarons in twisted homo-bilayer heterostructures
摘要：
我们考虑了在栅控扭曲同质双层异质结构中，强关联电子对激子性质的修饰。莫尔势和库仑相互作用的组合效应支持形成不同的强相关相，这取决于填充，包括电荷有序金属或整数占据的不可压缩绝缘体。激子和电子之间的耦合导致激子共振分裂成吸引和排斥极化子峰。通过分析激子-极化子在不同相态下的性质，我们发现在排斥极化子分支中，激子-极化子的谱线呈现不连续的演化，并形成双峰结构.非整数填充时出现双峰结构，其结构受费米能级附近的准粒子态与高能双光子激发态之间的能量分离控制。我们的研究结果表明，激子极化子进行了明确的电子相关性的标志，因此，提供了一个直接的签名的相关驱动绝缘体的形成在栅极控制的异质结构。
英文摘要：
We consider dressing of excitonic properties by strongly correlated electrons in gate controlled twisted homo-bilayer heterostructures. The combined effect of the moiré potential and the Coulomb interaction supports the formation of different strongly correlated phases depending on the filling, including charge-ordered metals or incompressible insulators at integer occupation. The coupling between excitons and electrons results in a splitting of the excitonic resonance into an attractive and a repulsive polaron peak. Analyzing the properties of the exciton-polarons across the different phases of the system, we reveal a discontinuous evolution of the spectrum with the formation of a double-peak structure in the repulsive polaron branch. The double-peak structure emerges for non-integer fillings and it is controlled by the energy separation between the quasi-particle states close to the Fermi level and the high-energy doublons excitations. Our results demonstrate that exciton-polarons carry a clear hallmark of the electronic correlations and, thus, provide a direct signature of the formation of correlation driven insulators in gate controlled heterostructures.
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