Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
Phys Rev Lett. 2011 Mar 18;106(11):115301. doi: 10.1103/PhysRevLett.106.115301. Epub 2011 Mar 16.
The experimental investigation of spontaneously created vortices is of utmost importance for the understanding of quantum phase transitions towards a superfluid phase, especially for two-dimensional systems that are expected to be governed by the Berezinski-Kosterlitz-Thouless physics. By means of time-resolved near-field interferometry we track the path of such vortices, created at random locations in an exciton-polariton condensate under pulsed nonresonant excitation, to their final pinning positions imposed by the stationary disorder. We formulate a theoretical model that successfully reproduces the experimental observations.
自发涡旋的实验研究对于理解超流相的量子相变至关重要，特别是对于二维系统，预计其将由 Berezinski-Kosterlitz-Thouless 物理来控制。通过时间分辨近场干涉测量，我们跟踪了在脉冲非共振激发下在激子极化激元凝聚体中随机位置产生的这些涡旋的路径，直到它们最终被固定的无序所固定。我们提出了一个成功再现实验观察的理论模型。
