We present measurements of the spectroscopic properties of an emerging quadrupling condensate with broken time-reversal symmetry... Read more
We report the direct observation of a single-flux quantum vortex splitting into two different fractions ... Read more
We observe splitting of an integer-flux vortex into several fractional vortices, leading to disparity between numbers of flux quanta and vortex cores... Read more
We construct toroflux: the superconducting analog of Chandrasekhar-Kendall states... Read more
We derive a model, alike to the Faddeev-Skyrme model, for the four-fermion reisitive state... Read more
These results demonstrate the existence of a broken-time-reversal-symmetry bosonic metal state... Read more
We investigate the properties of vortices and saddle points of the superfluid velocity in a cold atomic BEC... Read more
We demonstrate that vortices in a cold atomic BEC precess in a timecrystalline fashion... Read more
We use large-scale Monte-Carlo simulations to study thermal fluctuations in chiral $p$-wave superconductors... Read more
We demonstrate that vortices, in noncentrosymmetric superconductors, can exhibit an inversion of the magnetic field away from the vortex core... Read more
We consider a Josephson junction consisting of two non-centrosymmetric superconductors connected by a uniaxial ferromagnet... Read more
We demonstrate that two-component superconductors under certain conditions, excitations acquire the form of stable vortex loops and knots... Read more
We study the normal modes and their associated coherence lengths in dirty two-band superconductors with repulsive interband interactions... Read more
We discuss that in external field, dirty two-band superconductors do not feature a sharp $s_{\pm}\to s_{++}$ crossover but rather a washed-out crossover... Read more
We find that, in odd-parity superconductorsin odd-parity superconductors, the lowest-energy topological excitations are coreless vortices: a bound state of two spatially separated half-quantum vortices... Read more
I am a professor of theoretical physical physics at the Institut Denis Poisson,
at the University of Tours in France. I graduated from the University of Tours,
France with a Ph.D. in theoretical physics in 2010. After graduating in the
field of high energy physics, I switched to the field of condensed matter physics
at the Physics Department of the University of Massachusetts at Amherst, MA and
the Royal Institute of Technology in Stockholm, Sweden. There, I was a postdoctoral
fellow in Egor Babaev's group at the Department of Theoretical Physics at KTH-Royal
Institute of Technology in Stockholm, Sweden.
In parallel, I have been developping numerical methods for quantum computing,
as a consulting researcher for Microsoft Station Q.
I have also conducted research as a guest researcher at the Nordic Institute for
Theoretical Physics (NORDITA) in Stockholm, Sweden.
I study various aspect of field theories, and in particular the physics of
superconductivity and superfluity, ultra-cold atoms and magnetic systems.
I am interested into vortices, skyrmions and in a broader sense, in all kind
of topological defects arising in these contexts.
I am interested in studying physical properties of superconductors, superfluids and magnetism. I am generaly interested into solitons and computational physics.
My recent achivements :
- Demonstration that magnetic dipoles in bulk noncentrosymmetric superconductors, induce field configurations that are analogous to Chandrasekhar-Kendall states.
- Observation of quartic metallic phase in hole doped Ba$_{1-x}$K$_x$Fe$_2$As$_2$, with broken time-reversal symmetry in the resistive state.
- Demonstration that minimal energy states of a cold alkali atom Bose-Einstein condensate, in a non-rotating axially symmetric trap, with fixed angular momentum are generically asymmetric vortex solutions that precess around the trap center.
- Demonstration that vortices in noncentrosymmetric superconductors, feature an inversion of magnetic field inversion.
- Demonstration of the existence of superconducting knots stabilized by intercomponent dissipationless drag.
- Prediction of skyrmionic states in parity-odd nematic superconductors
- Prediction of a new kind of vortices featuring a circular nodal line, in addition to singular zeros of the order parameter.
- Demonstration of unusual thermoelectric properties can be used to generate electric and magnetic responses by locally heating superconducting candidate materials that break the time-reversal symmetry such as Ba$_{1-x}$K$_x$Fe$_2$As$_2$.
- Prediction that most commonly accepted model for chiral $p$-wave superconducting state in Sr$_2$RuO$_4$ supports two-quanta vortices that are always preferred as compared to isolated single quanta vortices.
- Prediction of a field-induced charge density wave order originating in competing pair density wave and $d$-wave superconducting states.
- Prediction of unconventional magnetic response in interface superconductors with a strong Rashba spin-orbit coupling
- Prediction of experimental signatures of domain wall structures in $s+is$ superconductors.
- Discovery of stable vortons within Witten model. These objects potentially apply to cosmology, QCD and condensed matter physics.
- Prediction of a new skyrmionic phase in $U(1)\times U(1)$ superconductors with dissipationless drag
- Explanation of vortex coalescence in Sr$_2$RuO$_4$
- Prediction of skyrmionic phase in chiral $p$-wave superconductors
- Discovery of a new kind of topological solitons in three-band superconductors with broken time reversal symmetry
- Finding of a new kind of collective modes in three-band superconductors with broken time reversal symmetry
- Finding of a new kind of multibody intervortex forces in multiband superconductors
A toroflux: the superconducting analog of Chandrasekhar-Kendall states
Skyrmion in the resistive electron quadrupling state
Stable knotted vortex in a two component superconductor
Variation of the interband phase difference in BTRS three-band superconductors induced by a hotspot created e.g. by a laser pulse.
A two-quanta (coreless) vortex also termed as skyrmion in a chiral $p$-wave superconductor. It is viewed as the pseudo-spin texture $n$ defined as the projection of superconducting degrees of freedom onto spin-1/2 Pauli matrices.
Checkerboard pattern of a charge-density-wave order induced in the core of a vortex in the $d$-wave order parameter. We show that a pair-density-wave order appears in the cores of $d$-wave vortices, driving checkerboard charge-density-wave.
A chiral skyrmion in three-band superconductors with broken time reversal symmetry. It is viewed as a texture of a pseudo-spin vector $\bf n=\frac{\Psi^\dagger\bf\sigma\Psi}{\Psi^\dagger\Psi}$ where the superconducting condensates are projected on spin-1 Pauli matrices.