Frédéric Chevy
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View article: Experimental realization of a SU(3) color-orbit coupling in an ultracold gas
Experimental realization of a SU(3) color-orbit coupling in an ultracold gas Open
Spin-orbit interaction couples the spin of a particle to its motion and leads to spin-induced transport phenomena such as spin-Hall effects and Chern insulators. In this work, we extend the concept of internal-external state coupling to hi…
View article: Downfolding a quantum many-body system: the quasi-1D Fermi polaron
Downfolding a quantum many-body system: the quasi-1D Fermi polaron Open
We investigate the properties of an impurity immersed in an ensemble of spin-polarized fermions confined in a tight quantum wire. We use a non-perturbative variational approach that accounts for virtual transverse excitations and regulariz…
View article: Quasi-particle residue and charge of the one-dimensional Fermi polaron
Quasi-particle residue and charge of the one-dimensional Fermi polaron Open
We consider a mobile impurity coupled to an ideal Fermi gas in one spatial dimension through an attractive contact interaction. We calculate the quasi-particle residue $Z$ exactly, based on Bethe Ansatz and diagrammatic Monte Carlo methods…
View article: Experimental realization of a SU(3) color-orbit coupling in an ultracold gas
Experimental realization of a SU(3) color-orbit coupling in an ultracold gas Open
Spin-orbit interaction couples the spin of a particle to its motion and leads to spin-induced transport phenomena such as spin-Hall effects and Chern insulators. In this work, we extend the concept of internal-external state coupling to hi…
View article: Experimental realization of a SU(3) color-orbit coupling in an ultracold gas
Experimental realization of a SU(3) color-orbit coupling in an ultracold gas Open
Spin-orbit interaction couples the spin of a particle to its motion and leads to spin-induced transport phenomena such as spin-Hall effects and Chern insulators. In this work, we extend the concept of internal-external state coupling to hi…
View article: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy Open
We perform a diagrammatic analysis of the energy of a mobile impurity immersed in a strongly interacting two-component Fermi gas to second order in the impurity-bath interaction. These corrections demonstrate divergent behavior in the limi…
View article: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy Open
We perform a diagrammatic analysis of the energy of a mobile impurity immersed in a strongly interacting two component Fermi gas to second order in the impurity-bath interaction. These corrections demonstrate divergent behavior in the limi…
View article: Achieving one-dimensionality with attractive fermions
Achieving one-dimensionality with attractive fermions Open
In this article we discuss the accuracy of effective one-dimensional theories\nused to describe the behavior of ultracold atomic ensembles confined in quantum\nwires by a harmonic trap. We derive within a fully many-body approach the\neffe…
View article: The Phantom Glass Mystery: a transition from dry to lubricated friction
The Phantom Glass Mystery: a transition from dry to lubricated friction Open
The phantom glass is a spectacular phenomenon that occurs when a warm glass placed upside down on a wet surface starts moving on its own, as if propelled by an invisible force. We show that this spontaneous motion is the result of a transi…
View article: Wave Packet Dynamics in Synthetic Non-Abelian Gauge Fields
Wave Packet Dynamics in Synthetic Non-Abelian Gauge Fields Open
It is generally admitted that in quantum mechanics, the electromagnetic potentials have physical interpretations otherwise absent in classical physics as illustrated by the Aharonov-Bohm effect. In 1984, Berry interpreted this effect as a …
View article: Mean field versus random-phase approximation calculation of the energy of an impurity immersed in a spin-1/2 superfluid
Mean field versus random-phase approximation calculation of the energy of an impurity immersed in a spin-1/2 superfluid Open
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View article: Wave-packet Dynamics in Synthetic Non-Abelian Gauge Fields
Wave-packet Dynamics in Synthetic Non-Abelian Gauge Fields Open
It is generally admitted that in quantum mechanics, the electromagnetic potentials have physical interpretations otherwise absent in classical physics as illustrated by the Aharonov-Bohm effect. In 1984, Berry interpreted this effect as a …
View article: <i>In Situ</i> Thermometry of Fermionic Cold-Atom Quantum Wires
<i>In Situ</i> Thermometry of Fermionic Cold-Atom Quantum Wires Open
We study ensembles of fermionic cold-atom quantum wires with tunable transverse mode population and single-wire resolution. From in situ density profiles, we determine the temperature of the atomic wires in the weakly interacting limit and…
View article: Roadmap on Atomtronics: State of the art and perspective
Roadmap on Atomtronics: State of the art and perspective Open
Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed in which coherent fl…
View article: Roadmap on Atomtronics
Roadmap on Atomtronics Open
Atomtronics is an emerging field of quantum technology dealing with matter-wave circuits of ultra-cold atoms manipulated in magnetic or laser-generated guides of different shapes and intensity. Atomtronic circuits are promised to define qu…
View article: Impurity immersed in a double Fermi sea
Impurity immersed in a double Fermi sea Open
We present a variational calculation of the energy of an impurity immersed a\ndouble Fermi sea of non-interacting Fermions. We show that in the\nstrong-coupling regime, the system undergoes a first order transition between\npolaronic and t…
View article: State of the art and perspective on Atomtronics
State of the art and perspective on Atomtronics Open
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed, in which coherent …
View article: An impurity immersed in a double Fermi Sea
An impurity immersed in a double Fermi Sea Open
We present a variational calculation of the energy of an impurity immersed a double Fermi sea of non-interacting Fermions. We show that in the strong-coupling regime, the system undergoes a first order transition between polaronic and trim…
View article: Quasithermalization of collisionless particles in quadrupole potentials
Quasithermalization of collisionless particles in quadrupole potentials Open
We analyze several puzzling features of a recent experiment with a\nnoninteracting gas of atoms in a quadrupole trap. After an initial momentum\nkick, the system reaches a stationary, quasi-thermal state even without\ncollisions, due to th…
View article: Conductivity Spectrum of Ultracold Atoms in an Optical Lattice
Conductivity Spectrum of Ultracold Atoms in an Optical Lattice Open
We measure the conductivity of neutral fermions in a cubic optical lattice. Using in situ fluorescence microscopy, we observe the alternating current resultant from a single-frequency uniform force applied by displacement of a weak harmoni…
View article: Nonlinear dynamics of coupled superfluids
Nonlinear dynamics of coupled superfluids Open
Following recent experiments on ultracold dual superflows, we model in this work the dynamics of two harmonically trapped counterflowing superfluids. Using complementary analytical and numerical approaches, we study the shedding of element…
View article: Collective modes of an imbalanced unitary Fermi gas
Collective modes of an imbalanced unitary Fermi gas Open
We study theoretically the collective mode spectrum of a strongly imbalanced two-component unitary Fermi gas in a cigar-shaped trap, where the minority species forms a gas of polarons. We describe the collective breathing mode of the gas i…
View article: Optical conductivity of a quantum gas
Optical conductivity of a quantum gas Open
We measure the conductivity of neutral fermions in a cubic lattice. A uniform force is applied at a single frequency by periodic displacement of the trapping potential, and the current response is observed though the global displacement o…
View article: Popsicle-Stick Cobra Wave
Popsicle-Stick Cobra Wave Open
The cobra wave is a popular physical phenomenon arising from the explosion of a metastable grillage made of popsicle sticks. The sticks are expelled from the mesh by releasing the elastic energy stored during the weaving of the structure. …
View article: 24-watts second-harmonic generation in ppZnO:LN ridge waveguide for lithium laser cooling
24-watts second-harmonic generation in ppZnO:LN ridge waveguide for lithium laser cooling Open
We present a simple all-solid-state laser source emitting 2.4 W of single-frequency light at 671 nm for laser cooling of lithium atoms. It is based on a diode-pumped solid-state laser, which is frequency doubled in a ppZnO:LN ridge wavegui…
View article: Connecting Few-Body Inelastic Decay to Quantum Correlations in a Many-Body System: A Weakly Coupled Impurity in a Resonant Fermi Gas
Connecting Few-Body Inelastic Decay to Quantum Correlations in a Many-Body System: A Weakly Coupled Impurity in a Resonant Fermi Gas Open
We study three-body recombination in an ultracold Bose-Fermi mixture. We first show theoretically that, for weak interspecies coupling, the loss rate is proportional to Tan's contact. Second, using a ^{7}Li/^{6}Li mixture we probe the reco…
View article: The popsicle-stick cobra wave
The popsicle-stick cobra wave Open
The cobra wave is a popular physical phenomenon arising from the explosion of a metastable grillage made of popsicle sticks. The sticks are expelled from the mesh by releasing the elastic energy stored during the weaving of the structure. …
View article: A simple quantum generator of random numbers
A simple quantum generator of random numbers Open
Cryptography techniques rely on chains of random numbers used to generate safe encryption keys. Since random number generator algorithms are in fact pseudo-random their behavior can be predicted if the generation method is known and as suc…
View article: Strongly correlated Bose gases
Strongly correlated Bose gases Open
The strongly interacting Bose gas is one of the most fundamental paradigms of\nquantum many-body physics and the subject of many experimental and theoretical\ninvestigations. We review recent progress on strongly correlated Bose gases,\nst…