Probing the dynamics of spontaneous quantum vortices in polariton superfluidsProbing the dynamics of spontaneous quantum vortices in polariton superfluids
Faculty of Sciences. Physics
Theory of quantum systems and complex systems
2011New York, N.Y., 2011
Physical review letters. - New York, N.Y.
106(2011):11, 4 p.
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.