Bandstructure of a coupled BEC-cavity system: effects of dissipation and geometry
arXiv:2504.17730 · doi:10.1103/l71r-m9l6
Abstract
We present a theoretical model for a transversally driven Bose-Einstein condensate coupled to an optical cavity. We focus on the interplay between different coherent couplings, which can trigger a structural phase transition, known as the superradiant phase transition. Our approach, based on band structure theory and a mean-field description, enables a comprehensive analysis of the nature of the system's excited modes, precursing the phase transitions. By incorporating dissipative couplings, intrinsic to these systems, we find non-Hermitian phenomena such as the coalescence of crossing precursor modes and the emergence of exceptional points (EPs). The general formulation of our model allows us to explain the role of an angle between transverse pump and the cavity deviating from . This offers us a unified perspective on the plethora of different implementations of such systems.
arXiv comment16 pages, 14 figures
References in corpus (33)
- The Dicke Quantum Phase Transition with a Superfluid Gas in an Optical Cavity
- The physics of exceptional points
- Roton-maxon spectrum and stability of trapped dipolar condensates
- Supersolid formation in a quantum gas breaking continuous translational symmetry
- Exceptional Points of Non-hermitian Operators
- Quantum phases from competing short- and long-range interactions in an optical lattice
- Quantum Criticality: competing ground states in low dimensions
- Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics
- Roton-type mode softening in a quantum gas with cavity-mediated long-range interactions
- Long-range interacting quantum systems
- SO(5) Theory of Antiferromagnetism and Superconductivity
- Observation of a superradiant Mott insulator in the Dicke-Hubbard model
- Observation of a continuous time crystal
- Monitoring and manipulating Higgs and Goldstone modes in a supersolid quantum gas
- Dissipation Induced Structural Instability and Chiral Dynamics in a Quantum Gas
- Supermode-Density-Wave-Polariton Condensation
- Measuring the dynamic structure factor of a quantum gas undergoing a structural phase transition
- Emerging dissipative phases in a superradiant quantum gas with tunable decay
- Steering matter wave superradiance with an ultra-narrowband optical cavity
- Self-oscillating pump in a topological dissipative atom-cavity system
- An optical lattice with sound
- Dynamical spin-orbit coupling of a quantum gas
- An adjustable-length cavity and Bose-Einstein condensate apparatus for multimode cavity QED
- Supersolid properties of a Bose-Einstein condensate in a ring resonator
- P-band induced self-organization and dynamics with repulsively driven ultracold atoms in an optical cavity
- Density-wave ordering in a unitary Fermi gas with photon-mediated interactions
- Strongly correlated Fermions strongly coupled to light
- Coupling two order parameters in a quantum gas
- Measuring the dynamics of a first order structural phase transition between two configurations of a superradiant crystal
- Observation of Subradiant Atomic Momentum States with Bose-Einstein Condensates in a Recoil Resolving Optical Ring Resonator
- Observation of a phase transition from a continuous to a discrete time crystal
- A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED
- Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions