Christoph Eigen
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View article: A universal speed limit for spreading of coherence
A universal speed limit for spreading of coherence Open
Discoveries of fundamental limits for the rates of physical processes, from the speed of light to the Lieb–Robinson bound for information propagation 1,2 , often lead to breakthroughs in the understanding of the underlying physics. Here we…
View article: Universal coarsening in a homogeneous two-dimensional Bose gas
Universal coarsening in a homogeneous two-dimensional Bose gas Open
Coarsening of an isolated far-from-equilibrium quantum system is a paradigmatic many-body phenomenon, relevant from subnuclear to cosmological length scales and predicted to feature universal dynamic scaling. Here, we observed universal sc…
View article: Fate of an impurity strongly interacting with a thermal Bose gas
Fate of an impurity strongly interacting with a thermal Bose gas Open
We spectroscopically study mobile impurities immersed in a homogeneous bosonic bath (a box-trapped Bose gas), varying the bath temperature and the strength of impurity-bath interactions. We compare our results to those for a quasipure Bose…
View article: Joule expansion of a quantum gas
Joule expansion of a quantum gas Open
We revisit the classic Joule-expansion experiments, now with a quantum-degenerate atomic Bose gas. In contrast to the classical-gas experiments, where no temperature change was measured, here we observe and quantitatively explain both cool…
View article: Joule expansion of a quantum gas
Joule expansion of a quantum gas Open
We revisit the classic Joule-expansion experiments, now with a quantum-degenerate atomic Bose gas. In contrast to the classical-gas experiments, where no temperature change was measured, here we observe and quantitatively explain both cool…
View article: Universal Quantum Dynamics of Bose Polarons
Universal Quantum Dynamics of Bose Polarons Open
Predicting the emergent properties of impurities immersed in a quantum bath is a fundamental challenge that can defy quasiparticle treatments. Here, we measure the spectral properties and real-time dynamics of mobile impurities injected in…
View article: Universal Quantum Dynamics of Bose Polarons
Universal Quantum Dynamics of Bose Polarons Open
Predicting the emergent properties of impurities immersed in a quantum bath is a fundamental challenge that can defy quasiparticle treatments. Here, we measure the spectral properties and real-time dynamics of mobile impurities injected in…
View article: Scaling laws governing the collapse of a Bose-Einstein condensate
Scaling laws governing the collapse of a Bose-Einstein condensate Open
We study the collapse of an attractive Bose-Einstein condensate, where an unstable system evolves towards a singularity, by numerically solving the underlying cubic-quintic nonlinear Schrödinger equation. We find good agreement between our…
View article: Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas
Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas Open
We observe an inverse turbulent-wave cascade, from small to large length scales, in a driven homogeneous 2D Bose gas. Starting with an equilibrium condensate, we drive the gas isotropically on a length scale much smaller than its size, and…
View article: Scaling Laws Governing the Collapse of a Bose-Einstein Condensate
Scaling Laws Governing the Collapse of a Bose-Einstein Condensate Open
We study the collapse of an attractive Bose-Einstein condensate, where an unstable system evolves towards a singularity, by numerically solving the underlying cubic-quintic nonlinear Schrödinger equation. We find good agreement between our…
View article: A universal speed limit for spreading of coherence
A universal speed limit for spreading of coherence Open
Discoveries of fundamental limits for the rates of physical processes, from the speed of light to the Lieb-Robinson bound for information propagation, often lead to breakthroughs in the our understanding of the underlying physics. Here we …
View article: Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas
Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas Open
We observe an inverse turbulent-wave cascade, from small to large lengthscales, in a driven homogeneous 2D Bose gas. Starting with an equilibrium condensate, we drive the gas isotropically on a lengthscale much smaller than its size, and o…
View article: Observation of Subdiffusive Dynamic Scaling in a Driven and Disordered Bose Gas
Observation of Subdiffusive Dynamic Scaling in a Driven and Disordered Bose Gas Open
We explore the dynamics of a tuneable box-trapped Bose gas under strong periodic forcing in the presence of weak disorder. In absence of interparticle interactions, the interplay of the drive and disorder results in an isotropic nonthermal…
View article: Energy-space random walk in a driven disordered Bose gas
Energy-space random walk in a driven disordered Bose gas Open
Motivated by the experimental observation [1] that driving a non-interacting Bose gas in a 3D box with weak disorder leads to power-law energy growth, with , and compressed-exponential momentum distributions that show dynamic scaling, w…
View article: Universal Coarsening in a Homogeneous Two-Dimensional Bose Gas
Universal Coarsening in a Homogeneous Two-Dimensional Bose Gas Open
Coarsening of an isolated far-from-equilibrium quantum system is a paradigmatic many-body phenomenon, relevant from subnuclear to cosmological lengthscales, and predicted to feature universal dynamic scaling. Here, we observe universal sca…
View article: Energy-space random walk in a driven disordered Bose gas
Energy-space random walk in a driven disordered Bose gas Open
Motivated by the experimental observation [1] that driving a non-interacting Bose gas in a 3D box with weak disorder leads to power-law energy growth, $E \propto t^η$ with $η=0.46(2)$, and compressed-exponential momentum distributions that…
View article: Observation of subdiffusive dynamic scaling in a driven and disordered Bose gas
Observation of subdiffusive dynamic scaling in a driven and disordered Bose gas Open
We explore the dynamics of a tuneable box-trapped Bose gas under strong periodic forcing in the presence of weak disorder. In absence of interparticle interactions, the interplay of the drive and disorder results in an isotropic nonthermal…
View article: Universal equation of state for wave turbulence in a quantum gas
Universal equation of state for wave turbulence in a quantum gas Open
Boyle's 1662 observation that the volume of a gas is, at constant temperature, inversely proportional to pressure, offered a prototypical example of how an equation of state (EoS) can succinctly capture key properties of a many-particle sy…
View article: Interacting Bose-condensed gases
Interacting Bose-condensed gases Open
We provide an overview of the effects of interactions in Bose-condensed gases. We focus on phenomena that have been explored in ultracold atom experiments, covering both tuneable contact interactions and dipolar interactions. Our discussio…
View article: Pinpointing Feshbach Resonances and Testing Efimov Universalities in $^{39}$K
Pinpointing Feshbach Resonances and Testing Efimov Universalities in $^{39}$K Open
Using a combination of bound-state spectroscopy and loss spectroscopy, we pinpoint eight intrastate Feshbach resonances in $^{39}$K, as well as six previously unexplored interstate ones. We also perform a detailed characterization of four …
View article: First and Second Sound in a Compressible 3D Bose Fluid
First and Second Sound in a Compressible 3D Bose Fluid Open
The two-fluid model is fundamental for the description of superfluidity. In the nearly-incompressible-liquid regime, it successfully describes first and second sound, corresponding, respectively, to density and entropy waves, in both liqui…
View article: Erratum: From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate [Phys. Rev. A <b>99</b>, 021601(R) (2019)]
Erratum: From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate [Phys. Rev. A <b>99</b>, 021601(R) (2019)] Open
Received 15 July 2021DOI:https://doi.org/10.1103/PhysRevA.104.049903©2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBose gasesBose-Einstein condensatesBosonsInterparticle interactionsNonlinear acousticsPhononsS…
View article: Research data supporting "Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate"
Research data supporting "Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate" Open
Data supporting the publication: The data presented in each figure is provided as well as all of the raw time traces of the center-of-mass velocity.\n\nThe ‘Fig’ folders contain text files with the data shown in each figure, with file name…
View article: Many-Body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate
Many-Body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate Open
We study the decay mechanism of the gapped lowest-lying axial excitation of a quasipure atomic Bose-Einstein condensate confined in a cylindrical box trap. Owing to the absence of accessible lower-energy modes, or direct coupling to an ext…
View article: Research data supporting "Bidirectional dynamic scaling in an isolated Bose gas far from equilibrium"
Research data supporting "Bidirectional dynamic scaling in an isolated Bose gas far from equilibrium" Open
Measured atom numbers, energies, and momentum distributions, as described in the linked manuscript.\nThe readme files provided include the necessary information to interpret and use the data.
View article: Research data & code supporting: 'Synthetic dissipation and cascade fluxes in a turbulent quantum gas'
Research data & code supporting: 'Synthetic dissipation and cascade fluxes in a turbulent quantum gas' Open
The supporting data folder contains all data presented in the paper as well as all the atom loss traces.\n\nThe simulation folder contains the code used to perform simulations of the Gross-Pitaevskii equation.\n\nSee the readme files withi…
View article: Exploring Interacting Bose Gases in and out of Equilibrium
Exploring Interacting Bose Gases in and out of Equilibrium Open
This thesis describes a collection of experiments that explore interacting ultracold Bose gases, both in and out of equilibrium. Our experiments are performed using a gas of $^{39}$K or $^{87}$Rb confined in the uniform potential of an opt…
View article: Can Three-Body Recombination Purify a Quantum Gas?
Can Three-Body Recombination Purify a Quantum Gas? Open
Three-body recombination in quantum gases is traditionally associated with heating, but it was recently found that it can also cool the gas. We show that in a partially condensed three-dimensional homogeneous Bose gas three-body loss could…
View article: From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate
From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate Open
We experimentally and theoretically investigate the lowest-lying axial excitation of an atomic Bose-Einstein condensate in a cylindrical box trap. By tuning the atomic density, we observe how the nature of the mode changes from a single-pa…