Metamorphosis of Goldstone and soft fluctuation modes in polariton lasers

For a driven-dissipative quantum many-body system prepared in a spontaneous broken-symmetry steady state, in addition to the Goldstone mode, the soft fluctuation modes provide important insight into the system's dynamics. Using a microscopic polariton laser theory, we find a rich transformation behavior of discrete and continuum soft modes in a two parameter (pump density and cavity dissipation rate) space. Our theory yields a unified picture of a variety of seemingly disconnected physical concepts including Mott transition, Mollow spectra or relaxation oscillations, polaritonic Bardeen-Cooper-Schrieffer gaps, and Goldstone companion modes. In particular, transformation paths connect the Goldstone companion modes with the Mollow analog modes across a line of exceptional points. © 2021 American Physical Society.National Science FoundationImmediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu