Seminar on "Exciton-polariton ring-shaped Josephson junction" by Dr. Nina Voronova

October 16 at 11.00, Moscow time, ACTP will hold the seminar on "Exciton-polariton ring-shaped Josephson junction" by Dr. Nina Voronova (RQC, National Research Nuclear University MEPHI). 16 октября в 11.00, состоится семинар, на котором будет заслушан доклад к.ф.-м.н. Нины Вороновой (РКЦ, Национальный исследовательский ядерный университет "МИФИ" ) "Экситон-поляритонный кольцевой джозефсоновский контакт". Abstract We present the first to our knowledge bosonic current-biased ring Josephson junction (JJ) realised in a system of exciton-polaritons. We show that the weak link created by means of incoherent optical beam in such a ring may work in two distinct regimes in which the phase of the order parameter either smoothly reconnects between the two sides of the barrier, creating zero or non-zero winding around the ring (the hydrodynamic regime), or experiences stochastic jumps resulting in statistics of different windings created within a given experimental setting (the Josephson regime, characterized by the sinusoidal behavior of the tunneling current). Drawing comparisons with superconducting rings interrupted by one JJ, we provide a simple theoretical model in terms of the 'tilted washboard' energy landscape that explains the appearance of these two regimes. These results show that weak links in ring condensates can be explored in optical integrated circuits and hold potential for room-temperature applications.