A5086241819- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Theoretical and Computational Physics
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Quantum and electron transport phenomena
- Strong Light-Matter Interactions
- Optical Network Technologies
- Nonlinear Dynamics and Pattern Formation
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Spectroscopy and Quantum Chemical Studies
University of Trento
2021-2024
Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications
2021-2022
Abstract Metastability stems from the finite lifetime of a state when lower-energy configuration is available but only by tunnelling through an energy barrier. It observed in many natural situations, including chemical processes and electron field ionization. In classical many-body systems, metastability naturally emerges presence first-order phase transition. A prototypical example supercooled vapour. The extension to quantum theory systems has attracted significant interest context...
We report on the experimental measurement of dispersion relation density and spin collective excitation modes in an elongated two-component superfluid ultracold bosonic atoms. Our parametric spectroscopic technique is based external modulation transverse confinement frequency, leading to formation Faraday waves. show that application a coherent coupling between two components reduces phase symmetry gives finite mass modes.
Ferromagnetism is an iconic example of a first-order phase transition taking place in spatially extended systems and characterized by hysteresis the formation domain walls. In this paper we demonstrate that atomic superfluid presence coherent coupling between two internal states exhibits quantum from para- to ferromagnetic state. The nature experimentally assessed looking at diagram as function control parameters, phenomena, magnetic susceptibility magnetization fluctuations around critical...
We theoretically study the coherent nonlinear response of electrons confined in semiconductor quantum wells under effect an electromagnetic radiation close to resonance with intersubband transition. Our approach is based on time-dependent Schr\"odinger-Poisson equation stemming from a Hartree description Coulomb-interacting electrons. This solved by standard numerical tools and results are interpreted terms approximated analytical formulas. For growing intensity, we observe redshift...
Abstract Ultracold atomic spin mixtures develop rich and intriguing magnetic properties when external radiation coherently couples different states. In particular, the coupled mixture may acquire a critical behavior interactions equal coupling energy. However, generally feature relatively high sensitivity to fields that can set limitation observable phenomena. this article, we present an overview of experimental studies magnetism based on superfluid multicomponent gases in ultrastable field...
We report on the experimental characterization of a spatially extended Josephson junction realized with coherently coupled two-spin-component Bose-Einstein condensate. The cloud is trapped in an elongated potential such that transverse spin excitations are frozen. extract nonlinear parameter three different manipulation protocols. outcomes all consistent simple local density approximation hydrodynamics, i.e., so-called Bose-Josephson equations. also identify method to produce states...
The minimization of the magnetic field plays a crucial role in ultracold gas research. For instance, contact interaction dominates all other energy scales zero limit, giving rise to novel quantum phases matter. However, lowering fields well below mG level is often challenging experiments. In this article, we apply Landau-Zener spectroscopy characterize and reduce on an sodium atoms few tens {\mu}G. lowest achieved here opens observing matter with spinor Bose gases.
Abstract Metastability is ubiquitous in nature and observed through the crossing of an energy barrier toward a configuration lower as, for example, chemical processes [1] or electron field ionization [2]. In classical many-body systems, metastability naturally emerges presence first-order phase transition finds prototypical example supercooled vapour. last decades, extension to quantum theory systems has attracted significant interest context statistical physics [3, 4], protein folding [5,...
In quantum field theory, the decay of an extended metastable state into real ground is known as ``false vacuum decay'' and it takes place via nucleation spatially localized bubbles. Despite large theoretical effort to estimate rate, experimental observations were still missing. Here, we observe bubble in isolated highly controllable superfluid atomic systems, find good agreement between our results, numerical simulations instanton theory opening way emulation out-of-equilibrium phenomena systems.
Ultracold atomic spin mixtures develop rich and intriguing magnetic properties when an external radiation coherently couples different states. In particular, the coupled mixture may acquire a critical behavior interactions equal coupling energy. However, generally feature relatively high sensitivity to fields that can set limitation observable phenomena. this article, we present overview of experimental studies magnetism based on superfluid multicomponent gases in ultrastable field...
The minimization of the magnetic field plays a crucial role in ultracold gas research. For instance, contact interaction dominates all other energy scales zero-magnetic-field limit, giving rise to novel quantum phases matter. However, lowering fields well below mG level is often challenging experiments. In this paper, we apply Landau-Zener spectroscopy characterize and reduce on an sodium atoms few tens $\textmu{}\mathrm{G}$. lowest achieved here opens way observing matter with spinor Bose gases.
Ferromagnetism is an iconic example of a first-order phase transition taking place in spatially extended systems and characterized by hysteresis the formation domain walls. In this paper we demonstrate that atomic superfluid presence coherent coupling between two internal states exhibits quantum from para- to ferromagnetic state. The nature experimentally assessed looking at diagram as function control parameters, phenomena, magnetic susceptibility magnetization fluctuations around critical...
We theoretically study the coherent nonlinear response of electrons confined in semiconductor quantum wells under effect an electromagnetic radiation close to resonance with intersubband transition. Our approach is based on time-dependent Schrödinger-Poisson equation stemming from a Hartree description Coulomb-interacting electrons. This solved by standard numerical tools and results are interpreted terms approximated analytical formulas. For growing intensity, we observe redshift effective...