论文标题
基于外部周期电势的TMDC条的极性和激子时间晶体
Polaritonic and Excitonic Time Crystals based on TMDC strips in an external periodic potential
论文作者
论文摘要
我们调查了在外部周期性潜力下的玻色网凝结物（BEC）的动力学。我们考虑了两个这样的系统，第一个系统是由激子 - 果胶制成的，它是在过渡金属二进制基因生成剂（TMDC）中，例如摩西$ _2 $，嵌入了具有特殊曲率的微腔中，它是外部电位的来源。第二个由旋转TMDC双层纳米孔中的裸露激子制成的，自然会产生一个周期性的Moiré电位，可以通过扭曲角度控制。我们证明了这样的系统表现出时间晶体（TC）阶段。计算出的BEC空间密度曲线显示出一种非平凡的两点相关器，该事实证明了这一事实，该相关器会随着时间的流逝而振荡。通过求解平均场近似值内密度矩阵的量子lindblad主方程来计算这些BEC密度曲线。然后，我们通过在主方程中添加一个随机项来超越通常的平均场方法，该方程与量子校正相对应，我们表明TC相位仍然存在。
We investigated the dynamics of Bose-Einstein condensates (BECs) under an external periodic potential. We consider two such systems, the first being made of exciton-polaritons in a nanoribbon of transition metal dichalcogenides (TMDCs), such as MoSe$_2$, embedded in a microcavity with a special curvature, which serves as the source of the external potential. The second, made of bare excitons in a nanoribbon of twisted TMDC bilayer, which naturally creates a periodic Moiré potential that can be controlled by the angle of twist. We proved that such systems exhibit a Time Crystal (TC) phase. This was demonstrated by the fact that the calculated BEC spatial density profile shows a non-trivial two-point correlator that oscillates in time. These BECs density profiles were calculated by solving the quantum Lindblad master equations for the density matrix within the mean-field approximation. We then go beyond the usual mean-field approach, by adding a stochastic term to the master equation, which corresponds to quantum corrections, and we show that the TC phase is still present.
