Observing dynamical currents in a non-Hermitian momentum lattice

Abstract

We report on the experimental realization and detection of dynamical currents in a spin-textured lattice in momentum space. Collective tunneling is implemented via cavity-assisted Raman scattering of photons by a spinor Bose-Einstein condensate into an optical cavity. The photon field inducing the tunneling processes is subject to cavity dissipation, resulting in effective directional dynamics in a non-Hermitian setting. We observe that the individual tunneling events are superradiant in nature and locally resolve them in the lattice by performing real-time, frequency-resolved measurements of the leaking cavity field. The results can be extended to a regime exhibiting a cascade of currents and simultaneous coherences between multiple lattice sites, where numerical simulations provide further understanding of the dynamics. Our observations showcase dynamical tunneling in momentum-space lattices and provide prospects to realize dynamical gauge fields in driven-dissipative settings.

References in corpus (61)

• Theory of Bose-Einstein condensation in trapped gases
• Electron-phonon interactions from first principles
• Topological phases of non-Hermitian systems
• Light-induced gauge fields for ultracold atoms
• Quantum Simulators: Architectures and Opportunities
• Quantum phases from competing short- and long-range interactions in an optical lattice
• Quantum Simulations of Lattice Gauge Theories using Ultracold Atoms in Optical Lattices
• Topological quantum matter in synthetic dimensions
• Ultracold Quantum Gases and Lattice Systems: Quantum Simulation of Lattice Gauge Theories
• Floquet approach to ${\mathbb{Z}}_2$ lattice gauge theories with ultracold atoms in optical lattices
• The multi-configurational time-dependent Hartree method for bosons: Many-body dynamics of bosonic systems
• Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics
• Ultracold atoms out of equilibrium
• Extended Bose-Hubbard Models with Ultracold Magnetic Atoms
• Realization of density-dependent Peierls phases to engineer quantized gauge fields coupled to ultracold matter
• Observation of photon-assisted tunneling in optical lattices
• Tunable non-reciprocal quantum transport through a dissipative Aharonov-Bohm ring in ultracold atoms
• Dynamical polarizability of atoms in arbitrary light fields: general theory and application to cesium
• Strong saturation absorption imaging of dense clouds of ultracold atoms
• Floquet engineering of correlated tunneling in the Bose-Hubbard model with ultracold atoms
• The transverse breathing mode of an elongated Bose-Einstein condensate
• Dissipation Induced Structural Instability and Chiral Dynamics in a Quantum Gas
• Spinor self-ordering of a quantum gas in a cavity
• Multiconfigurational time-dependent Hartree approaches for indistinguishable particles
• Photon-Assisted Tunneling in a Biased Strongly Correlated Bose Gas
• Quantum Many-Body Scars in Optical Lattices
• Observation of density-dependent gauge fields in a Bose-Einstein condensate based on micromotion control in a shaken two-dimensional lattice
• Formation of a spin texture in a quantum gas coupled to a cavity
• Emulating Solid-State Physics with a Hybrid System of Ultracold Ions and Atoms
• The multiconfigurational time-dependent Hartree for fermions: Implementation, exactness and application to few-fermion tunneling to open space
• Ultracold Lattice Gases with Periodically Modulated Interactions
• The multiconfigurational time-dependent Hartree method for bosons with internal degrees of freedom: Theory and composite fragmentation of multi-component Bose-Einstein condensates
• Emerging dissipative phases in a superradiant quantum gas with tunable decay
• Atom-optics simulator of lattice transport phenomena
• An atom optics approach to studying lattice transport phenomena
• Correlated dynamics in a synthetic lattice of momentum states
• Interacting atomic quantum fluids on momentum-space lattices
• Pulse delay time statistics in a superradiant laser with calcium atoms
• Raman Amplification of Matter Waves
• Quantum scars of bosons with correlated hopping
• Quantum simulation of correlated-hopping models with fermions in optical lattices
• MCTDH-X: The multiconfigurational time-dependent Hartree method for indistinguishable particles software
• Dynamical spin-orbit coupling of a quantum gas
• Analysis of Kapitza-Dirac diffraction patterns beyond the Raman-Nath regime
• Nonlinear dynamics in a synthetic momentum state lattice
• Theory of a Quantum Scanning Microscope for Cold Atoms
• Dissipation-engineered family of nearly dark states in many-body cavity-atom systems
• Optomechanical atom-cavity interaction in the sub-recoil regime
• From the Jaynes-Cummings model to non-Abelian gauge theories: a guided tour for the quantum engineer
• Self-organized topological insulator due to cavity-mediated correlated tunneling
• Correlated hopping of bosonic atoms induced by optical lattices
• Continuous feedback on a quantum gas coupled to an optical cavity
• A cavity-induced artificial gauge field in a Bose-Hubbard ladder
• Continuous Measurement of an Atomic Current
• Theory of collective Raman scattering from a Bose-Einstein condensate
• Atomic self-organization emerging from tunable quadrature coupling
• Open Quantum-System Simulation of Faraday's Induction Law via Dynamical Instabilities
• Correlated Spin-Flip Tunneling in a Fermi Lattice Gas
• Cavity-induced spin-orbit coupling in an interacting bosonic wire
• Theory for Raman superradiance in atomic gases
• Many-Body Phases of a Planar Bose-Einstein Condensate with Cavity-Induced Spin-Orbit Coupling

Cited by in corpus (23)

• Dimensional transmutation from non-Hermiticity
• A comprehensive review on developments of synthetic dimensions
• Topological origin of non-Hermitian skin effect in higher dimensions and uniform spectra
• Dissipation-engineered family of nearly dark states in many-body cavity-atom systems
• Non-Hermitian Absorption Spectroscopy
• Many-body non-Hermitian skin effect under dynamic gauge coupling
• Entanglement phase transitions in non-Hermitian quasicrystals
• Bound states and photon emission in non-Hermitian nanophotonics
• Spin- and Momentum-Correlated Atom Pairs Mediated by Photon Exchange and Seeded by Vacuum Fluctuations
• Experimental realization of a fermionic spin-momentum lattice
• Condensate formation in a dark state of a driven atom-cavity system
• Unbounded entropy production and violent fragmentation for repulsive-to-attractive interaction quench in long-range interacting systems
• Lecture Notes: many-body quantum dynamics with MCTDH-X
• Photon-mediated correlated hopping in a synthetic ladder
• Semi-classical theory of quantum stochastic resistors
• Intertwining of lasing and superradiance under spintronic pumping
• Control and amplification of Bloch oscillations via photon-mediated interactions
• Dynamics of spin-momentum entanglement from superradiant phase transitions
• Boundary-driven many-body phase transitions in a non-Hermitian disordered fermionic chain
• Dynamical phases of a BEC in a bad optical cavity at optomechanical resonance
• Beyond-mean-field phases of rotating dipolar condensates
• Decoding the drive-bath interplay: A guideline to enhance superconductivity
• Pauli crystal superradiance