A5059054446- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Theoretical and Computational Physics
- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Nonlinear Photonic Systems
- Advanced Thermodynamics and Statistical Mechanics
- Strong Light-Matter Interactions
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Topological Materials and Phenomena
- Black Holes and Theoretical Physics
- Quantum Computing Algorithms and Architecture
- Cosmology and Gravitation Theories
- Nonlinear Dynamics and Pattern Formation
- Advanced Fiber Laser Technologies
- Complex Systems and Time Series Analysis
- Quantum chaos and dynamical systems
- Nonlinear Waves and Solitons
- Quantum Electrodynamics and Casimir Effect
- Stochastic processes and statistical mechanics
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2016-2025
Scuola Internazionale Superiore di Studi Avanzati
2016-2025
University of Trieste
2016-2025
Istituto Officina dei Materiali
2015-2025
AREA Science Park
2014-2024
ETH Zurich
2023
A. Alikhanyan National Laboratory
2022
Joint Institute for Nuclear Research
2022
Dubna State University
2022
Heidelberg University
2022
We study the dynamical phase diagram of a dilute Bose-Einstein condensate (BEC) trapped in periodic potential. The dynamics is governed by discrete nonlinear Schrödinger equation: intrinsically localized excitations, including solitons and breathers, can be created even if BEC's interatomic potential repulsive. Furthermore, we analyze Anderson-Kasevich experiment [Science 282, 1686 (1998)], pointing out that mean field effects lead to coherent destruction interwell Bloch oscillations.
We report on the direct observation of an oscillating atomic current in a one-dimensional array Josephson junctions realized with Bose-Einstein condensate. The is created by laser standing wave, condensates trapped valleys periodic potential and weakly coupled interwell barriers. coherence multiple tunneling between adjacent wells continuously probed interference. square small-amplitude oscillation frequency proportional to microscopic rate each condensate through barriers provides...
Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through magnetic or laser-generated guides different shapes and intensities. In this way, new types quantum networks can be constructed in which coherent fluids are controlled the know-how developed atomic molecular physics community. particular, devices enhanced precision, control, flexibility their operating conditions accessed. Concomitantly, simulators emulators harnessing on current flows also developed. Here,...
Many-body quantum physics with long-range interactions of variable range and strength can be studied in experiments Rydberg atom arrays, dipolar systems, trapped ions, cold atoms cavities. This review identifies common universal features induced by the such as extensive or nonextensive character total energy that deviate from case short-range interactions. A comparison corresponding results for classical systems is presented.
We predict a dynamical classical superfluid-insulator transition in Bose-Einstein condensate trapped an optical and magnetic potential. In the tight-binding limit, this system realizes array of weakly coupled condensates driven by external harmonic field. For small displacements parabolic trap about equilibrium position, coherently oscillate array. large displacements, remain localized on side with randomization relative phases. The is due to discrete modulational instability, occurring when...
We report the first experimental observation of nonlinear self-trapping Bose-condensed 87Rb atoms in a one-dimensional waveguide with superimposed deep periodic potential . The trapping effect is confirmed directly by imaging atomic spatial distribution. Increasing nonlinearity we move system from diffusive regime, characterized an expansion condensate, to dominated where initial stops and width remains finite. data are quantitative agreement solutions corresponding discrete equation. Our...
The Josephson effect is a macroscopic quantum phenomenon that reveals the broken symmetry associated with any superfluid state. Here we report on observation of between two fermionic superfluids coupled through thin tunneling barrier. We show relative population and phase are canonically conjugate dynamical variables throughout crossover from molecular Bose-Einstein condensate (BEC) to Bardeen-Cooper-Schrieffer (BCS) regime. For larger initial excitations equilibrium, dynamics become...
Several recent experiments in atomic, molecular and optical systems motivated a huge interest the study of quantum long-range %spin systems. Our goal this paper is to present general description their critical behavior phases, devising treatment valid $d$ dimensions, with an exponent $d+\sigma$ for power-law decay couplings presence $O(N)$ symmetry. By introducing convenient ansatz effective action, we determine phase diagram $N$-component rotor model interactions, $N=1$ corresponding Ising...
We investigate the transport properties in out-of-equilibrium dynamics of strongly correlated dipolar fermions initially localized one-dimensional inhomogeneous optical lattice. The is studied by experimentally measurable dynamical variables such as one-body density, pair-correlation function and size expanding cloud. In noninteracting limit, we trace usual fingerprints ballistic expansion short time dynamics. However, affected system due to Pauli principle. also exhibits significant...
The dynamics of Bose-Einstein condensates trapped in a deep optical lattice is governed by discrete nonlinear equation (DNL). Its degree nonlinearity and the intersite hopping rates are retrieved from tight-binding approximation taking into account effective dimensionality each condensate. We derive analytically Bloch Bogoliubov excitation spectra, velocity sound waves emitted traveling Within Lagrangian formalism, we obtain Newtonian-like equations motion localized wavepackets. calculate...
In this paper we propose to apply the analogy between gravity and condensed matter physics relativistic Bose-Einstein condensates (RBECs), i.e. composed by constituents. While such systems are not yet a subject of experimental realization, they do provide us with very rich analogue model gravity, characterized several novel features respect their non-relativistic counterpart. Relativistic exhibit two (rather than one) quasi-particle excitations, massless massive one, latter disappearing in...
The repulsive Lieb-Liniger model can be obtained as the non-relativistic limit of Sinh-Gordon model: all physical quantities latter (S-matrix, Lagrangian and operators) put in correspondence with those former. We use this mapping, together Thermodynamical Bethe Ansatz equations exact form factors model, to set up a compact general formalism for computing expectation values both at zero finite temperature. computation one-point correlators is thoroughly detailed and, when possible, compared...
We present a novel method to compute expectation values in the Lieb-Liniger model both at zero and finite temperature. These quantities, relevant physics of one-dimensional ultracold Bose gases, are expressed by series that has remarkable behavior convergence. Among other results, we show computation three-body value temperature, quantity rules recombination rate gas.
We study, by renormalization group methods, O(N) models with interactions decaying as power law exponent d+σ. When only the long-range momentum term p(σ) is considered in propagator, critical exponents can be computed from those of corresponding short-range at an effective fractional dimension D(eff). Neglecting wave function effects result for D(eff)=2d/σ, which turns to exact spherical model limit (N→∞). Introducing a running becomes instead D(eff)=(2-η(SR))d/σ. The latter coincides one...
The authors analyze the energy transfer in a quantum system by experimentally accessing exchange statistics of subjected to stochastic projective measurements. Employing nitrogen-vacancy spin diamond interacting with tunable dissipation channel, they demonstrate validity fluctuation relation for an open system.
We compute the ground-state correlation functions of an exactly solvable chain integer spins, recently introduced in [R. Movassagh and P. W. Shor, arXiv:1408.1657], whose ground state can be expressed terms a uniform superposition all colored Motzkin paths. Our analytical results show that for spin $s\ensuremath{\ge}2$ there is violation cluster decomposition property. This has to contrasted with $s=1$, where property holds. Correspondingly, $s=1$ one gets light-cone profile propagation...
We discuss how nonlocality originates in long-range quantum systems and it affects their dynamics at out of the equilibrium. focus particular on Kitaev chains with pairings Ising chain antiferromagnetic coupling (both having a power-law decay exponent \alpha). By studying dynamic correlation functions, we find that for every finite \alpha two different behaviours can be identified, one typical short-range other connected locality violation. The latter behaviour is shown related also known...
The study of critical properties systems with long-range interactions has attracted, in recent decades, a continuing interest and motivated the development several analytical numerical techniques, particular connection spin models. From point view investigation their criticality, special role is played by which are enough that universality class different from short-range case and, nevertheless, they maintain extensivity thermodynamical quantities. Such often called weak long-range. In this...
We study the onset of dissipation in an atomic Josephson junction between Fermi superfluids molecular Bose-Einstein condensation limit strong attraction. Our simulations identify critical population imbalance and maximum current delimiting dissipationless dissipative transport, quantitative agreement with recent experiments. unambiguously link to vortex ring nucleation dynamics, demonstrating that quantum phase slips are responsible for observed resistive current. work directly connects...
The Berezinskii-Kosterlitz-Thouless (BKT) transition is the paradigmatic example of a topological phase without symmetry breaking, where quasiordered phase, characterized by power-law scaling correlation functions at low temperature, disrupted proliferation excitations above critical temperature T_{BKT}. In this Letter, we consider effect long-range decaying couplings ∼r^{-2-σ} on BKT transition. After pointing out relevance nontrivial problem, discuss diagram, which far richer than...
The presence of non-local and long-range interactions in quantum systems induces several peculiar features their equilibrium out-of-equilibrium behavior. In current experimental platforms control parameters such as interaction range, temperature, density dimension can be changed. existence universal scaling regimes, where diverse physical observables display quantitative agreement, generates a common framework, the efforts different research communities -- some cases rigorously connected....
We discuss the role of quantum coherence in energy fluctuations open systems. To this aim, we introduce a protocol, to which refer as end-point-measurement scheme, allowing define statistics changes function measurements performed only after evolution initial state. At price an additional uncertainty on energies, approach prevents loss coherences and enables estimation their effects fluctuations. demonstrate our findings by running experiment IBM Quantum Experience superconducting qubit platform.
Engineered dynamical maps combining coherent and dissipative transformations of quantum states with measurements, have demonstrated a number technological applications, promise to be crucial tool in thermodynamic processes. Here, we exploit the control on effective open spin qutrit dynamics an NV center, experimentally realize autonomous feedback process (Maxwell demon) tunable strength. The is enabled by random measurement events that condition subsequent evolution qutrit. efficacy Maxwell...
Abstract We study the effect of competing interactions on ensemble inequivalence. consider a one-dimensional Ising model with ferromagnetic mean-field and short-range nearest-neighbor next-nearest-neighbor
couplings which can be either or antiferromagnetic. Despite relative simplicity model, our calculations in microcanonical reveal rich phase diagram. The comparison corresponding diagram canonical shows presence transition points lines are different two ensembles. As an example,...