Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 35: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)
DY 35.8: Vortrag
Mittwoch, 14. März 2018, 11:45–12:00, H 3010
Nonequilibrium gas-liquid transition in the driven-dissipative photonic lattice — Matteo Biondi1, Gianni Blatter1, Hakan Tureci2, and •Sebastian Schmidt1 — 1ETH Zurich, Institute for Theoretical Physics, Switzerland — 2Princeton University, Department of Electrical Engineering, USA
We study the nonequilibrium steady state of the driven-dissipative Bose-Hubbard model with Kerr nonlinearity. Employing a mean-field decoupling for the intercavity hopping J, we find that the steep crossover between low and high photon-density states inherited from the single cavity transforms into a gas-liquid bistability at large cavity-coupling J. We formulate a van der Waals-like gas-liquid phenomenology for this nonequilibrium setting and determine the relevant phase diagrams, including a new type of diagram where a lobe-shaped boundary separates smooth crossovers from sharp, hysteretic transitions. Calculating quantum trajectories for a one-dimensional system, we provide insights into the microscopic origin of this many-body bistability.