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Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
Markus Greiner, Olaf Mandel, Tilman Esslinger +2
For a system at a temperature of absolute zero, all thermal fluctuations are frozen out, while quantum fluctuations prevail. These microscopic quantum fluctuations can induce a mac…
Interactions enable Thouless pumping in a nonsliding lattice
Konrad Viebahn, Anne-Sophie Walter, Eric Bertok +5
A topological 'Thouless' pump represents the quantised motion of particles in response to a slow, cyclic modulation of external control parameters. The Thouless pump, like the quan…
DC transport in a dissipative superconducting quantum point contact
Anne-Maria Visuri, Jeffrey Mohan, Shun Uchino +3
We study the current-voltage characteristics of a superconducting junction with particle losses at the contacts. We adopt the Keldysh formalism to compute the steady-state current…
Spin- and Momentum-Correlated Atom Pairs Mediated by Photon Exchange and Seeded by Vacuum Fluctuations
Fabian Finger, Rodrigo Rosa-Medina, Nicola Reiter +3
Engineering pairs of massive particles that are simultaneously correlated in their external and internal degrees of freedom is a major challenge, yet essential for advancing fundam…
An accordion superlattice for controlling atom separation in optical potentials
Simon Wili, Tilman Esslinger, Konrad Viebahn
We propose a method for separating trapped atoms in optical lattices by large distances. The key idea is the cyclic transfer of atoms between two lattices of variable spacing, know…
Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries
Zijie Zhu, Marius Gächter, Anne-Sophie Walter +2
The transport properties of gapless edge modes at boundaries between topologically distinct domains are of fundamental and technological importance. Therefore, it is crucial to gai…
Phases, instabilities and excitations in a two-component lattice model with photon-mediated interactions
Leon Carl, Rodrigo Rosa-Medina, Sebastian D. Huber +3
Engineering long-range interacting spin systems with ultra cold atoms offers the possibility to explore exotic magnetically ordered phases in strongly-correlated scenarios. Quantum…
Superfluid signatures in a dissipative quantum point contact
Meng-Zi Huang, Jeffrey Mohan, Anne-Maria Visuri +6
We measure superfluid transport of strongly interacting fermionic lithium atoms through a quantum point contact with local, spin-dependent particle loss. We observe that the charac…
Tunable Non-equilibrium Phase Transitions between Spatial and Temporal Order through Dissipation
Zhao Zhang, Davide Dreon, Tilman Esslinger +3
We propose an experiment with a driven quantum gas coupled to a dissipative optical cavity that realizes a novel kind of far-from-equilibrium phase transition between spatial and t…
Quantisation and its breakdown in a Hubbard-Thouless pump
Anne-Sophie Walter, Zijie Zhu, Marius Gächter +5
Geometric properties of waves and wave functions can explain the appearance of integer-valued observables throughout physics. For example, these 'topological' invariants describe t…
Topological pumping in a Floquet-Bloch band
Joaquín Minguzzi, Zijie Zhu, Kilian Sandholzer +3
Constructing new topological materials is of vital interest for the development of robust quantum applications. However, engineering such materials often causes technological overh…
Self-oscillating pump in a topological dissipative atom-cavity system
Davide Dreon, Alexander Baumgärtner, Xiangliang Li +3
Pumps are transport mechanisms in which direct currents result from a cyclic evolution of the potential. As Thouless has shown, the pumping process can have topological origins, wh…
Floquet engineering of individual band gaps in an optical lattice using a two-tone drive
Kilian Sandholzer, Anne-Sophie Walter, Joaquín Minguzzi +3
The dynamic engineering of band structures for ultracold atoms in optical lattices represents an innovative approach to understand and explore the fundamental principles of topolog…
Dissipation-engineered family of nearly dark states in many-body cavity-atom systems
Rui Lin, Rodrigo Rosa-Medina, Francesco Ferri +5
Three-level atomic systems coupled to light have the capacity to host dark states. We study a system of V-shaped three-level atoms coherently coupled to the two quadratures of a di…
Observing dynamical currents in a non-Hermitian momentum lattice
Rodrigo Rosa-Medina, Francesco Ferri, Fabian Finger +6
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…
Emerging dissipative phases in a superradiant quantum gas with tunable decay
Francesco Ferri, Rodrigo Rosa-Medina, Fabian Finger +5
Exposing a many-body system to external drives and losses can transform the nature of its phases and opens perspectives for engineering new properties of matter. How such character…
Flat band transport and Josephson effect through a finite-size sawtooth lattice
Ville A. J. Pyykkönen, Sebastiano Peotta, Philipp Fabritius +3
We study theoretically the transport through a finite-size sawtooth lattice coupled to two fermionic reservoirs kept in the superfluid state. We focus on the DC Josephson effect an…
Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
Samuel Häusler, Philipp Fabritius, Jeffrey Mohan +3
We study thermoelectric currents of neutral, fermionic atoms flowing through a mesoscopic channel connecting a hot and a cold reservoir across the superfluid transition. The thermo…
Measuring the dynamics of a first order structural phase transition between two configurations of a superradiant crystal
Xiangliang Li, Davide Dreon, Philip Zupancic +6
We observe a structural phase transition between two configurations of a superradiant crystal by coupling a Bose-Einstein condensate to an optical cavity and applying imbalanced tr…
Suppressing dissipation in a Floquet-Hubbard system
Konrad Viebahn, Joaquìn Minguzzi, Kilian Sandholzer +3
The concept of `Floquet engineering' relies on an external periodic drive to realise novel, effectively static Hamiltonians. This technique is being explored in experimental platfo…
Continuous feedback on a quantum gas coupled to an optical cavity
Katrin Kroeger, Nishant Dogra, Rodrigo Rosa-Medina +4
We present an active feedback scheme acting continuously on the state of a quantum gas dispersively coupled to a high-finesse optical cavity. The quantum gas is subject to a transv…
Quantized conductance through a dissipative atomic point contact
Laura Corman, Philipp Fabritius, Samuel Häusler +5
Signatures of quantum transport are expected to quickly vanish as dissipation is introduced in a system. This dissipation can take several forms, including that of particle loss, w…
P-band induced self-organization and dynamics with repulsively driven ultracold atoms in an optical cavity
P. Zupancic, D. Dreon, X. Li +6
We investigate a Bose-Einstein condensate strongly coupled to an optical cavity via a repulsive optical lattice. We detect a stable self-ordered phase in this regime, and show that…
Two-mode Dicke model from non-degenerate polarization modes
Andrea Morales, Davide Dreon, Xiangliang Li +4
We realize a non-degenerate two-mode Dicke model with competing interactions in a Bose-Einstein condensate (BEC) coupled to two orthogonal polarization modes of a single optical ca…