Tobias Ulrik Donner


Last Name

Donner

First Name

Tobias Ulrik

ORCID

0000-0001-7016-587X

Organisational unit

03599 - Esslinger, Tilman / Esslinger, Tilman

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Publications1 - 10 of 46
  • Sideband cooling of micromechanical motion to the quantum ground state
    Item type: Journal Article
    Teufel, John D.; Donner, Tobias Ulrik; Li, Dale; et al. (2011)
    Nature
  • Cavity QED with a Bose-Einstein condensate
    Item type: Journal Article
    Brennecke, Ferdinand; Donner, Tobias Ulrik; Ritter, Stephan; et al. (2007)
    Nature
  • Criticality and correlations in cold atomic gases
    Item type: Conference Paper
    Köhl, Michael; Donner, Tobias Ulrik; Ritter, Stephan; et al. (2008)
    Advances in Solid State Physics ~ Advances in Solid State Physics
  • Supersolid formation in a quantum gas breaking a continuous translational symmetry
    Item type: Journal Article
    Léonard, Julian; Morales, Andrea; Zupancic, Philip; et al. (2017)
    Nature
  • Self-oscillating pump in a topological dissipative atom–cavity system
    Item type: Journal Article
    Dreon, Davide; Baumgärtner, Alexander; Li, Xiangliang; et al. (2022)
    Nature
  • Critical behavior of a trapped interacting Bose gas
    Item type: Journal Article
    Donner, Tobias Ulrik; Ritter, S.; Bourdel, T.; et al. (2007)
    Science
  • Pauli crystal superradiance
    Item type: Journal Article
    Ortuño-Gonzalez, Daniel; Lin, Rui; Stefaniak, Justyna; et al. (2026)
    Physical Review Letters
    Pauli crystals are unique geometric structures of non-interacting fermions, resembling crystals, that emerge solely from Fermi statistics and confinement. Unlike genuine quantum crystals that arise from interparticle interactions, Pauli crystals do not break translation symmetry but nonetheless exhibit nontrivial many-body correlations. In this Letter, we explore Pauli crystal formation in a cavity-fermion setup. We analytically show that when coupled to a cavity, degeneracy in Pauli crystals can trigger zero-threshold transitions to superradiance. This superradiance is accompanied by the emergence of a genuine quantum crystalline state, wherein the atomic density is periodically modulated. We substantiate our findings using state-of-the-art numerical simulations. The combined interplay between statistics, confinement geometry and interactions mediated by light thus facilitates a novel pathway to quantum crystallization.
  • Synchronization of Quasiparticle Excitations in a Quantum Gas with Cavity-Mediated Interactions
    Item type: Journal Article
    Natale, Gabriele; Baumgärtner, Alexander; Stefaniak, Justyna; et al. (2026)
    Physical Review Letters
    Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective nonequilibrium behavior. We study such a transition in a Bose-Einstein condensate coupled to an optical cavity and develop a cavity-assisted Bragg spectroscopy technique to resolve its collective modes. We observe dissipation-induced synchronization at the quasiparticle level, where two rotonlike modes coalesce at an exceptional point. This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.
  • Quantum Fluctuation Dynamics of Dispersive Superradiant Pulses in a Hybrid Light-Matter System
    Item type: Journal Article
    Stitely, Kevin C.; Finger, Fabian; Rosa-Medina Pimentel, Rodrigo Felipe; et al. (2023)
    Physical Review Letters
    We consider theoretically a driven-dissipative quantum many-body system consisting of an atomic ensemble in a single-mode optical cavity as described by the open Tavis-Cummings model. In this hybrid light-matter system, the interplay between coherent and dissipative processes leads to superradiant pulses with a buildup of strong correlations, even for systems comprising hundreds to thousands of particles. A central feature of the mean-field dynamics is a self-reversal of two spin degrees of freedom due to an underlying time-reversal symmetry, which is broken by quantum fluctuations. We demonstrate a quench protocol that can maintain highly non-Gaussian states over long timescales. This general mechanism offers interesting possibilities for the generation and control of complex fluctuation patterns, as suggested for the improvement of quantum sensing protocols for dissipative spin amplification.
  • Two-mode Dicke model from nondegenerate polarization modes
    Item type: Journal Article
    Morales, Andrea; Dreon, Davide; Li, Xiangliang; et al. (2019)
    Physical Review A
    We realize a nondegenerate two-mode Dicke model with competing interactions in a Bose-Einstein condensate (BEC) coupled to two orthogonal polarization modes of a single optical cavity. The BEC is coupled to the cavity modes via the scalar and vectorial part of the atomic polarizability. We can independently change these couplings and determine their effect on a self-organization phase transition. Measuring the phases of the system, we characterize a crossover from a single-mode to a two-mode Dicke model. This work provides perspectives for the realization of coupled phases of spin and density.
Publications1 - 10 of 46