44 citations · 351 across the 34 of their papers we have counts for
34 papers
A low-energy effective Hamiltonian for Landau quasiparticles: II. Application to the contact Fermi gas
Pierre-Louis Taillat, Hadrien Kurkjian
This article follows up on arxiv:2511.15938, in which we developed an Hamiltonian renormalization scheme to construct a quantized theory of Fermi liquids. Here, we apply this forma…
The crossover from classical to quantum transport in a weakly-interacting Fermi gas
Hadrien Kurkjian
We present an exact solution of the quantum kinetic equation of a weakly interacting Fermi gas in the crossover from the degenerate Fermi-liquid regime to the classical Boltzmann g…
A low-energy effective Hamiltonian for Landau quasiparticles: I. A unified theory of transport and superfluidity in Fermi liquids
Pierre-Louis Taillat, Hadrien Kurkjian
We introduce a new renormalisation scheme to construct the Landau quasiparticles of Fermi fluids. The scheme introduces an energy cutoff to remove the resonant couplings, enabl…
Exact perturbative expansion of the transport coefficients of a normal low-temperature Fermi gas with contact interactions
Pierre-Louis Taillat, Hadrien Kurkjian
We compute the shear viscosity, thermal conductivity and spin diffusivity of a Fermi gas with short-range interactions in the Fermi liquid regime of the normal phase, that is at te…
Dispersion of first sound in a weakly interacting ultracold Fermi liquid
Thomas Repplinger, Songtao Huang, Yunpeng Ji +2
At low temperature, a normal gas of unpaired spin-1/2 fermions is one of the cleanest realizations of a Fermi liquid. It is described by Landau's theory, where no phenomenological…
Emergence of Sound in a Tunable Fermi Fluid
Songtao Huang, Yunpeng Ji, Thomas Repplinger +6
Landau's Fermi-liquid (FL) theory has been successful at the phenomenological description of the normal phase of many different Fermi systems. Using a dilute atomic Fermi fluid wit…
Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
Théo Malas-Danzé, Alexandre Dugelay, Nir Navon +1
We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are…
Interaction quenches in nonzero temperature fermionic condensates
Hadrien Kurkjian, Victor E. Colussi, Paul Dyke +2
We revisit the study of amplitude oscillations in a pair condensate of fermions after an interaction quench, and generalize it to nonzero temperature. For small variations of the o…
Higgs oscillations in a unitary Fermi superfluid
P. Dyke, S. Musolino, H. Kurkjian +7
Symmetry-breaking phase transitions are central to our understanding of states of matter. When a continuous symmetry is spontaneously broken, new excitations appear that are tied t…
Low-Lying Collective Excitations of Superconductors and Charged Superfluids
S. N. Klimin, J. Tempere, H. Kurkjian
We investigate theoretically the momentum-dependent frequency and damping of low-lying collective excitations of superconductors and charged superfluids in the BCS-BEC crossover re…
Collective excitations of a charged Fermi superfluid in the BCS-BEC crossover
S. N. Klimin, J. Tempere, T. Repplinger +1
We consider collective excitations in the superfluid state of Fermi condensed charged gases. The dispersion and damping of collective excitations at nonzero temperatures are examin…
Dispersion of plasmons in three-dimensional superconductors
T. Repplinger, S. Klimin, M. Gélédan +2
We study the plasma branch of an homogeneous three-dimensional electron gas in an -wave superconducting state. We focus on the regime where the plasma frequency is compara…
Quasiparticle disintegration in fermionic superfluids
Senne Van Loon, Jacques Tempere, Hadrien Kurkjian
We study the fermionic quasiparticle spectrum in a zero-temperature superfluid Fermi gas, and in particular how it is modified by different disintegration processes. On top of the…
Bose-Einstein condensation of Efimovian triples in the unitary Bose gas
S. Musolino, H. Kurkjian, M. Van Regemortel +3
In an atomic Bose-Einstein condensate quenched to the unitary regime, we predict the sequential formation of a significant fraction of condensed pairs and triples. At short-distanc…
Collective excitations of superfluid Fermi gases near the transition temperature
S. N. Klimin, J. Tempere, H. Kurkjian
Studying the collective pairing phenomena in a two-component Fermi gas, we predict the appearance near the transition temperature of a well-resolved collective mode of quadra…
Cumulant theory of the unitary Bose gas: Prethermal and Efimovian dynamics
V. E. Colussi, H. Kurkjian, M. Van Regemortel +4
We study the quench of a degenerate ultracold Bose gas to the unitary regime, where interactions are as strong as allowed by quantum mechanics. We lay the foundations of a cumulant…
Damping of elementary excitations in one-dimensional dipolar Bose gases
Hadrien Kurkjian, Zoran Ristivojevic
In the presence of dipolar interactions the excitation spectrum of a Bose gas can acquire a local minimum. The corresponding quasiparticles are known as rotons. They are gaped and…
Anderson-Bogoliubov collective excitations in superfluid Fermi gases at nonzero temperatures
S. N. Klimin, H. Kurkjian, J. Tempere
The Anderson-Bogoliubov branch of collective excitations in a condensed Fermi gas is treated using the effective bosonic action of Gaussian pair fluctuations. The spectra of collec…
Linear response of a superfluid Fermi gas inside its pair-breaking continuum
H. Kurkjian, J. Tempere, S. N. Klimin
We study the signatures of the collective modes of a superfluid Fermi gas in its linear response functions for the order-parameter and density fluctuations in the Random Phase Appr…
Leggett collective excitations in a two-band Fermi superfluid at finite temperatures
S. N. Klimin, H. Kurkjian, J. Tempere
The Leggett collective excitations for a two-band Fermi gas with s-wave pairing and Josephson interband coupling in the BCS-BEC crossover at finite temperatures are investigated wi…
Beyond mean-field corrections to the quasiparticle spectrum of superfluid Fermi gases
Senne Van Loon, Jacques Tempere, Hadrien Kurkjian
We investigate the fermionic quasiparticle branch of superfluid Fermi gases in the BCS-BEC crossover and calculate the quasiparticle lifetime and energy shift due to its coupling w…
Collective excitation branch in the continuum of pair-condensed Fermi gases : analytical study and scaling laws
Yvan Castin, Hadrien Kurkjian
The pair-condensed unpolarized spin- Fermi gases have a collective excitation branch in their pair-breaking continuum (V.A. Andrianov, V.N. Popov, 1976). We study it at zero t…
Pair-Breaking Collective Branch in BCS Superconductors and Superfluid Fermi Gases
Hadrien Kurkjian, S. N. Klimin, J. Tempere +1
We demonstrate the existence of a collective excitation branch in the pair-breaking continuum of superfluid Fermi gases and BCS superconductors. At zero temperature, we analyticall…
Transition from supersonic to subsonic waves in superfluid Fermi gases
Senne Van Loon, Wout Van Alphen, Jacques Tempere +1
We study the propagation of dispersive waves in superfluid Fermi gases in the BEC-BCS crossover. Unlike in other superfluid systems, where dispersive waves have already been studie…