358 citations · 1.6k across the 24 of their papers we have counts for
24 papers
Controlled bit-flip of period-doubling and discrete time crystalline states in open systems
Roy D. Jara, Phatthamon Kongkhambut, Hans Keßler +2
In this work, we explore the robustness of a bit-flip operation against thermal and quantum noise for bits represented by the symmetry-broken pairs of the period-doubled (PD) state…
Observation of a zero-energy excitation mode in the open Dicke model
Anton Bolian, Phatthamon Kongkhambut, Christoph Georges +6
Approaching phase boundaries in many-body systems can give rise to intriguing signatures in their excitation spectra. Here, we explore the excitation spectrum of a Bose-Einstein co…
Torus bifurcation of a dissipative time crystal
Jayson G. Cosme, Phatthamon Kongkhambut, Anton Bölian +5
Using a quantum gas setup consisting of a Bose-Einstein condensate strongly coupled to a high-finesse optical cavity by a transverse pump laser, we experimentally observe an instab…
Isotope shift measurement of the 423-nm transition in neutral Ca
David Röser, Lukas Möller, Hans Keßler +1
We report on saturated absorption spectroscopy measurements of the transition for the four most abundant even-mass isotopes in calcium. By…
Observation of a phase transition from a continuous to a discrete time crystal
Phatthamon Kongkhambut, Jayson G. Cosme, Jim Skulte +4
Discrete (DTCs) and continuous time crystals (CTCs) are novel dynamical many-body states, that are characterized by robust self-sustained oscillations, emerging via spontaneous bre…
Realizing limit cycles in dissipative bosonic systems
Jim Skulte, Phatthamon Kongkhambut, Hans Keßler +3
We propose a general mechanism for generating limit cycle (LC) oscillations by coupling a linear bosonic mode to a dissipative nonlinear bosonic mode. By analyzing the stability ma…
Enhancing exotic quantum fluctuations in a strongly entangled cavity BEC system
Leon Mixa, Hans Keßler, Andreas Hemmerich +1
We show that the strong coupling of a quantum light field and correlated quantum matter induces exotic quantum fluctuations in the matter sector. We determine their spectral charac…
Condensate formation in a dark state of a driven atom-cavity system
Jim Skulte, Phatthamon Kongkhambut, Sahana Rao +4
We demonstrate condensate formation in a dark state in an ultracold quantum gas coupled to a high-finesse cavity and pumped by a shaken optical lattice. We show experimentally and…
Observation of a continuous time crystal
Phatthamon Kongkhambut, Jim Skulte, Ludwig Mathey +3
Time crystals are classified as discrete or continuous depending on whether they spontaneously break discrete or continuous time translation symmetry. While discrete time crystals…
Progress towards a matter wave interferometer for inertial sensing with non-destructive monitoring of Bloch oscillations
D. Rivero, C. Beli Silva, M. A. Moreno Armijo +6
We report on our progress in the construction of a continuous matter-wave interferometer for inertial sensing via the non-destructive observation of Bloch oscillations. At the pres…
Realization of a periodically driven open three-level Dicke model
Phatthamon Kongkhambut, Hans Keßler, Jim Skulte +3
A periodically driven open three-level Dicke model is realized by resonantly shaking the pump field in an atom-cavity system. As an unambiguous signature, we demonstrate the emerge…
Parametrically driven-dissipative three-level Dicke model
Jim Skulte, Phatthamon Kongkhambut, Hans Keßler +3
We investigate the three-level Dicke model, which describes a fundamental class of light-matter systems. We determine the phase diagram in the presence of dissipation, which we ass…
Fermionization via cavity-assisted infinite-range interactions
Paolo Molignini, Camille Lévêque, Hans Kessler +3
We study a one-dimensional array of bosons with infinite-range interactions mediated by a laser-driven dissipative optical cavity. The cavity-mediated infinite-range interactions o…
Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment
Rui Lin, Christoph Georges, Jens Klinder +6
The competition between short-range and cavity-mediated infinite-range interactions in a cavity-boson system leads to the existence of a superfluid phase and a Mott-insulator phase…
Observation of a dissipative time crystal
Hans Keßler, Phatthamon Kongkhambut, Christoph Georges +3
The formation of a phase of matter can be associated with the spontaneous breaking of a symmetry. For crystallization, this broken symmetry is the spatial translation symmetry, as…
From a continuous to a discrete time crystal in a dissipative atom-cavity system
Hans Keßler, Jayson G. Cosme, Christoph Georges +2
We propose the dynamical stabilization of a nonequilibrium order in a driven dissipative system comprised an atomic Bose-Einstein condensate inside a high finesse optical cavity, p…
Dynamical density wave order in an atom-cavity system
Christoph Georges, Jayson G. Cosme, Hans Keßler +2
We theoretically and experimentally explore the emergence of a dynamical density wave order in a driven dissipative atom-cavity system. A Bose-Einstein condensate is placed inside…
Emergent limit cycles and time crystal dynamics in an atom-cavity system
Hans Keßler, Jayson G. Cosme, Michal Hemmerling +2
We propose an experimental realization of a time crystal using an atomic Bose-Einstein condensate in a high finesse optical cavity pumped with laser light detuned to the blue side…
Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps
P H Moriya, M O Araújo, F Todão +5
The theoretical description of the external degrees of freedom of atoms trapped inside a magneto-optical trap (MOT) often relies on the decoupling of the evolution of the internal…
Non-destructive monitoring of Bloch oscillations in an optical cavity
H. Keßler, J. Klinder, B. P. Venkatesh +2
Bloch oscillations are a hallmark of coherent wave dynamics in periodic potentials. They occur as the response of quantum mechanical particles in a lattice if a weak force is appli…
Observation of a superradiant Mott insulator in the Dicke-Hubbard model
J. Klinder, H. Keßler, M. Reza Bakhtiari +2
It is well known that the bosonic Hubbard model possesses a Mott insulator phase. Likewise, it is known that the Dicke model exhibits a self-organized superradiant phase. By implem…
Dynamical phase transition in the open Dicke model
J. Klinder, H. Keßler, M. Wolke +2
The Dicke model with a weak dissipation channel is realized by coupling a Bose-Einstein condensate to an optical cavity with ultra-narrow bandwidth. We explore the dynamical critic…
Steering matter wave superradiance with an ultra-narrowband optical cavity
H. Keßler, J. Klinder, M. Wolke +1
A superfluid atomic gas is prepared inside an optical resonator with an ultra-narrow band width on the order of the single photon recoil energy. When a monochromatic off-resonant l…
Optomechanical atom-cavity interaction in the sub-recoil regime
H Keßler, J Klinder, M Wolke +1
We study the optomechanical interaction of a Bose-Einstein condensate with a single longitudinal mode of an ultra-high finesse standing wave optical resonator. As a unique feature…