论文标题
二维混合钙钛矿单层中的激子涡流
Exciton vortices in two-dimensional hybrid perovskite monolayers
论文作者
论文摘要
从理论上讲，我们在二维（2D）钙钛矿（PEA）2pbi4单层中研究了激子玻色丝凝结和激子涡流。结合了第一原理计算和Keldysh模型，单层中（PEA）2pbi4的激子结合能可以接近数百个MEV，这使得可以在室温下观察激子效应。由于激子的结合能以及激子的高密度，我们发现激子冷凝的临界温度可以接近液氮状态。在存在垂直电场的情况下，发现激子之间的偶极 - 偶极相互作用可将冷凝的激子驱动到图案化的涡流中，因为涡流图案的进化时间与激子的寿命相当。
We study theoretically the exciton Bose-Einstein condensation and exciton vortices in a two-dimensional (2D) perovskite (PEA)2PbI4 monolayer. Combining the first-principles calculations and the Keldysh model, the exciton binding energy of (PEA)2PbI4 in a monolayer can approach hundreds meV, which make it possible to observe the excitonic effect at room temperature. Due to the large exciton binding energy, and hence the high density of excitons, we find that the critical temperature of the exciton condensation could approach the liquid nitrogen regime. In presence of perpendicular electric fields, the dipole-dipole interaction between excitons is found to drive the condensed excitons into patterned vortices, as the evolution time of vortex patterns is comparable to the exciton lifetime.
