A5062555671- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Atomic and Subatomic Physics Research
- Theoretical and Computational Physics
- Advanced Thermodynamics and Statistical Mechanics
- Physics of Superconductivity and Magnetism
- Stochastic processes and statistical mechanics
- Global Financial Regulation and Crises
- State Capitalism and Financial Governance
- Material Dynamics and Properties
- Complex Systems and Time Series Analysis
- Quantum Computing Algorithms and Architecture
- Statistical Mechanics and Entropy
- Laser-Matter Interactions and Applications
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Banking stability, regulation, efficiency
Université de Strasbourg
2019-2022
Centre National de la Recherche Scientifique
2019-2022
Institut de Science et d'Ingénierie Supramoléculaires
2021
Institut de Physique et Chimie des Matériaux de Strasbourg
2019
University of Pisa
2015-2017
National Institute of Optics
2017
Istituto di Scienza e Tecnologie dell'Informazione "Alessandro Faedo"
2016-2017
Power-law interactions play a key role in large variety of physical systems. In the presence disorder, these systems may undergo many-body localization for sufficiently disorder. Within localized phase system presents time an algebraic growth entanglement entropy, $S_{vN}(t)\propto t^{\gamma}$. Whereas critical disorder depends on parameters, we find by extensive numerical calculations that exponent $\gamma$ acquires universal value $\gamma_c\simeq 0.33$ at transition, different lattice...
We report on the direct measurement in real space of effect van der Waals forces between individual Rydberg atoms their external degrees freedom. Clusters with interparticle distances around $5\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}$ are created by first generating a small number seed excitations magneto-optical trap, followed off-resonant excitation that leads to chain facilitated events. After variable expansion time field ionized, and from arrival distributions size cluster...
Strong, long-range interactions present a unique challenge for the theoretical investigation of quantum many-body lattice models, due to generation large numbers competing states at low energy. Here, we investigate class extended bosonic Hubbard models with off-site terms interpolating between short and infinite range, thus allowing an exact numerical solution all interaction strengths. We predict novel type stripe crystal strong coupling. Most interestingly, intermediate strengths...
We report an experimental investigation of the facilitated excitation dynamics in off-resonantly driven Rydberg gases by separating initial off-resonant phase from facilitation phase, which successive events lead to avalanches.We achieve this creating a controlled number seed excitations.Greater insight into avalanche mechanism is obtained analysis full counting distributions.We also present simple mathematical models and numerical simulations avalanches that agree well with our results.
We study an array of ultracold atoms in optical lattice (Mott insulator) excited with a coherent ultrashort laser pulse to state where single-electron wave functions spatially overlap. Beyond threshold principal quantum number Rydberg orbitals neighboring sites overlap each other, the efficiently undergo spontaneous Penning ionization resulting drastic change ion-counting statistics, sharp increase avalanche ionization, and formation plasma. These observations signal actual creation...
We investigate the ground state properties of one-dimensional hard-core bosons interacting via a variable long-range potential using density matrix renormalization group. show that restoring energy extensivity in system, which is done by rescaling interaction with suitable size-dependent factor known as Kac's prescription, has profound influence on low-energy thermodynamic limit. While an insulating phase found absence rescaling, latter leads to new metallic does not fall into conventional...
We present experimental results on the controlled deexcitation of Rydberg states in a cold gas Rb atoms. The effect van der Waals interactions between atoms is clearly seen spectrum and dynamics. Our observations are confirmed by numerical simulations. In particular, for off-resonant (facilitated) excitation we find that reflects spatial arrangement quasi-one-dimensional geometry our experiment. discuss future applications this technique implications detection dissipation schemes.
We investigate the out-of-equilibrium physics of monodisperse bosonic ensembles on a square lattice. The effective Hamiltonian description these systems is given in terms an extended Hubbard model with cluster-forming interactions relevant to experimental realizations cold Rydberg-dressed atoms. ground state model, recently investigated [Phys. Rev. Lett. 123, 045301 (2019)], features, aside from superfluid and stripe crystalline phase occurring at small large interaction strength $V$,...
In the absence of frustration, interacting bosons in ground state exist either superfluid or insulating phases. Superfluidity corresponds to frictionless flow matter field, and optical conductivity is revealed through a distinct $\delta$-functional peak at zero frequency with amplitude known as Drude weight. This characteristic low-frequency feature instead absent phases, defined by static conductivity. Here we demonstrate that bosonic particles disordered one dimensional, $d=1$, systems can...
The disorder-induced quantum phase transition between superfluid and non-superfluid states of bosonic particles in one dimension is generally expected to be the Berezinskii-Kosterlitz-Thouless (BKT) type. Here, we show that hard-core lattice bosons with integrable power-law hopping decaying distance as $1/r^\alpha$ - corresponding spin language a $XY$ model couplings undergo non-BKT continuous instead. We use exact Monte-Carlo methods determine diagram for different values exponent $\alpha$,...
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