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Alessio Recati's Website

I am a physicist working at the Pitaevskii Center for Bose-Einstein Condensation in Trento (Italy).

My research activity mainly focuses on the field of ultra-cold gases. In the last years I have been addressing questions on:
Dipolar gases, Bose-Bose Mixtures, Fermi and Bose Superfluidity, Polaron Physics, Low-dimensional systems, Analog Models


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Here a simple, very brief, nice visual introduction to the world of cold gases by TED.com

Short scientific CV

Current Position and roles:

Academic career/fellowships/awards

Others

People

Victor Colussi Dr. Carlos Benavides-Riveros

Marie-Curie Post-Doc Fellow: Carlos, from Columbia, joined our group in September 2022 thanks to a Marie Curie fellowship.
e-mail: cabenavir at gmail.com
phone: +39 0461 283924

Daniele Contessi Dr. Daniele Contessi

Scientific Collaborator
e-mail: daniele.contessi at unitn.it
phone: +39 0461 283924

Sebastiano Bresolin Mr. Sebastiano Bresolin

PhD: Sebastiano joined us at the end of 2020 thanks to a UniTN fellowship.
e-mail: sebastaino.bresolin at unitn.it
phone:

Marjia Sindik Ms. Marjia Šindik

PhD (funded by the Q@TN initiative): Marjia joined us in October 2021, with a project on dipolar and spinor gases
e-mail: marija.sindik at unitn.it
phone:

Tomasz Zawislak Mr. Tomasz Zawiślak

PhD: Tomasz joined us the 1st November 2022 thanks to a UniTN fellowship.
e-mail: tomasz.zawislak at unitn.it
phone:

News

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False Vacuum Decay Cold Gases Observation of false vacuum decay via bubble formation in ferromagnetic superfluids

In quantum field theory, the decay of an extended metastable state into the real ground state is known as ``false vacuum decay'' and it takes place via the nucleation of spatially localized bubbles. Despite the large theoretical effort to estimate the nucleation rate, experimental observations were still missing. Here, we observe bubble nucleation in isolated and highly controllable superfluid atomic systems, and we find good agreement between our results, numerical simulations and instanton theory opening the way to the emulation of out-of-equilibrium quantum field phenomena in atomic systems.
Alessandro Zenesini, Anna Berti, Riccardo Cominotti, Chiara Rogora, Ian G. Moss, Thomas P. Billam, Iacopo Carusotto, Giacomo Lamporesi, Alessio Recati, Gabriele Ferrari, arXiv:2305.05225

oscillating magnetic soliton Oscillating Solitons and AC Josephson Effect in Ferromagnetic Bose-Bose Mixtures

Close to the demixing transition, the degree of freedom associated to relative density fluctuations of a two-component Bose-Einstein condensate is described by a non-dissipative Landau-Lifshitz equation. In the quasi one-dimensional weakly immiscible case, this mapping surprisingly predicts that a dark-bright soliton should oscillate when subject to a constant force favoring separation of the two components. We propose a realistic experimental implementation of this phenomenon which we interpret as a spin-Josephson effect in the presence of a movable barrier.
Sebastiano Bresolin, Arko Roy, Gabriele Ferrari, Alessio Recati, Nicolas Pavloff, Phys. Rev. Lett. 130, 220403 (2023)

Lattice Polaron Lattice polarons across the superfluid to Mott insulator transition

We study the physics of a mobile impurity confined in a lattice, moving within a Bose-Hubbard bath at zero temperature. Within the Quantum Gutzwiller formalism, we develop a beyond-Fröhlich model of the bath-impurity interaction. Results for the properties of the polaronic quasiparticle formed from the dressing of the impurity by quantum fluctuations of the bath are presented throughout the entire phase diagram, focusing on the quantum phase transition between the superfluid and Mott insulating phases. Here we find that the modification of the impurity properties is highly sensitive to the different universality classes of the transition, providing an unambiguous probe of correlations and collective modes in a quantum critical many-body environment.
V. E. Colussi, F. Caleffi, C. Menotti, A. Recati, Phys. Rev. Lett. 130, 173002 (2023)

extended hubbard model phase diagram Phase Diagram Detection via Gaussian Fitting of Number Probability Distribution

We investigate the number probability density function that characterizes sub-portions of a quantum many-body system with globally conserved number of particles. We put forward a linear fitting protocol capable of mapping out the ground-state phase diagram of the rich one-dimensional extended Bose-Hubbard model: The results are quantitatively comparable with more sophisticated traditional and machine learning techniques. We argue that the studied quantity should be considered among the most informative bipartite properties, being moreover readily accessible in atomic gases experiments.
Daniele Contessi, Alessio Recati, Matteo Rizzi, Phys. Rev. B, L121403 (2023)

spin dispersion relation BEC Observation of Massless and Massive Collective Excitations with Faraday Patterns in a Two-Component Superfluid

We report on the experimental measurement of the dispersion relation of the density and spin collective excitation modes in an elongated two-component superfluid of ultracold bosonic atoms. Our parametric spectroscopic technique is based on the external modulation of the transverse confinement frequency, leading to the formation of density and spin Faraday waves. We show that the application of a coherent coupling between the two components reduces the phase symmetry and gives a finite mass to the spin modes.
R. Cominotti, A. Berti, A. Farolfi, A. Zenesini, G. Lamporesi, I. Carusotto, A. Recati and G. Ferrari, Phys. Rev. Lett. 128, 210401 (2022)

Alessio Recati's Pubblications

Full list here (PDF)

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Pre-Print

  1. Sound, superfluidity and layer compressibility in a ring dipolar supersolid
    Marija Šindik, Tomasz Zawiślak, Alessio Recati, Sandro Stringari
    arXiv:2308.05981
  2. Observation of false vacuum decay via bubble formation in ferromagnetic superfluids
    Alessandro Zenesini, Anna Berti, Riccardo Cominotti, Chiara Rogora, Ian G. Moss, Thomas P. Billam, Iacopo Carusotto, Giacomo Lamporesi, Alessio Recati, Gabriele Ferrari
    arXiv:2305.05225
  3. Decoherence and momentum relaxation in Fermi-polaron Rabi dynamics: a kinetic equation approach
    Tomasz Wasak, Matteo Sighinolfi, Johannes Lang, Francesco Piazza, Alessio Recati
    arXiv:2205.05941

Recent publications

  1. Bose–Einstein condensation
    Leonardo Fallani, Massimo Inguscio, Alessio Recati, Sandro Stringari
    Encyclopedia Of Condensed Matter Physics 68 (2024)
  2. Supersolidity in ultracold dipolar gases
    Alessio Recati and Sandro Stringari
    Nature Reviews Physics 10 (2023)
  3. Oscillating Solitons and AC Josephson Effect in Ferromagnetic Bose-Bose Mixtures
    Sebastiano Bresolin, Arko Roy, Gabriele Ferrari, Alessio Recati, Nicolas Pavloff
    Phys. Rev. Lett. 130, 220403 (2023)
  4. Ferromagnetism in an extended coherently-coupled atomic superfluid
    Riccardo Cominotti, Anna Berti, Clement Dulin, Chiara Rogora, Giacomo Lamporesi, Iacopo Carusotto, Alessio Recati, Alessandro Zenesini, Gabriele Ferrari
    Phys. Rev. X 13, 021037 (2023)
  5. Mass-driven vortex collisions in flat superfluids
    Andrea Richaud, Giacomo Lamporesi, Massimo Capone, Alessio Recati
    Phys. Rev. A 107, 053317 (2023)
  6. Lattice polarons across the superfluid to Mott insulator transition
    V. E. Colussi, F. Caleffi, C. Menotti, A. Recati
    Phys. Rev. Lett. 130, 173002 (2023)
  7. Finite temperature ferromagnetic transition in coherently coupled Bose gases
    Arko Roy, Miki Ota, Franco Dalfovo, Alessio Recati
    Phys. Rev. A 107, 043301 (2023)
  8. Phase Diagram Detection via Gaussian Fitting of Number Probability Distribution
    Daniele Contessi, Alessio Recati, Matteo Rizzi
    Phys. Rev. B 107, L121403 (2023)
  9. Creation and robustness of quantized vortices in a dipolar supersolid when crossing the superfluid-to-supersolid transition
    Marija Sindik, Alessio Recati, Santo Maria Roccuzzo, Luis Santos, Sandro Stringari
    Phys. Rev. A 106, L061303 (2022)
  10. Coherently Coupled Mixtures of Bose-Einstein Condensed Gases
    Alessio Recati, Sandro Stringari
    Annual Review Of Condensed Matter Physics 13 407-432 (2022)
  11. Detection of Berezinskii-Kosterlitz-Thouless transition via Generative Adversarial Networks
    D. Contessi, E. Ricci, A. Recati, M. Rizzi
    SciPost Phys. 12, 107 (2022)
  12. Observation of Massless and Massive Collective Excitations with Faraday Patterns in a Two-Component Superfluid
    Riccardo Cominotti, Anna Berti, Arturo Farolfi, Alessandro Zenesini, Giacomo Lamporesi, Iacopo Carusotto, Alessio Recati, G. Ferrari
    Phys. Rev. Lett. 128, 210401 (2022)
  13. Quantum Gutzwiller approach for the two-component Bose-Hubbard model
    V. E. Colussi, F. Caleffi, C. Menotti, A. Recati
    SciPost Phys. 12, 111 (2022)
  14. Stochastic Dynamics and Bound States of Heavy Impurities in a Fermi Bath
    Matteo Sighinolfi, Davide De Boni, Alessandro Roggero, Giovanni Garberoglio, Pietro Faccioli, Alessio Recati
    Phys. Rev. A 105, 043308 (2022)
  15. Moment of Inertia and Dynamical Rotational Response of a Supersolid Dipolar Gas
    S. M. Roccuzzo, A. Recati, S. Stringari
    Phys. Rev A 105, 023316 (2022)
  16. Quantum-torque-induced breaking of magnetic domain walls in ultracold gases
    Arturo Farolfi, Alessandro Zenesini, Dimitris Trypogeorgos, Carmelo Mordini, Albert Gallemì, Arko Roy, Alessio Recati, Giacomo Lamporesi, Gabriele Ferrari
    Nat. Phys. 17, 1359 (2021)
  17. Beyond-mean-field effects in Rabi-coupled two-component Bose-Einstein condensate
    L. Lavoine, A. Hammond, A. Recati, D. Petrov, T. Bourdel
    Phys. Rev. Lett. 127, 203402 (2021)
  18. Supersolid edge and bulk phases of a dipolar quantum gas in a box
    S. M. Roccuzzo, S. Stringari, Alessio Recati
    Phys. Rev. Research 4, 013086 (2021)
  19. Manipulation of an elongated internal Josephson junction of bosonic atoms
    A. Farolfi, A. Zenesini, D. Trypogeorgos, A. Recati, G. Lamporesi, G. Ferrari
    Phys. Rev. A 104, 023326 (2021)
  20. High-energy Bragg scattering measurements of a dipolar supersolid
    D. Petter, A. Patscheider, G. Natale, M. J. Mark, M. A. Baranov, R. v. Bijnen, S. M. Roccuzzo, A. Recati, B. Blakie, D. Baillie, L. Chomaz, F. Ferlaino
    Phys. Rev. A 104, L0011302 (2021)
  21. Linear Response Study of Collisionless Spin Drag
    Donato Romito, Carlos Lobo, Alessio Recati
    Phys. Rev. Research 3, 023196 (2021)
  22. Collisionless drag for a one-dimensional two-component Bose-Hubbard model
    Daniele Contessi, Donato Romito, Matteo Rizzi, Alessio Recati
    Phys. Rev. Research 3, L022017 (2021)
  23. Impurity dephasing in a Bose-Hubbard model
    Fabio Caleffi, Massimo Capone, Ines de Vega, Alessio Recati
    New J. Physics 23, 033018 (2021)
  24. Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
    Arko Roy, Miki Ota, Alessio Recati, Franco Dalfovo
    Phys. Rev. Research 3, 013161 (2021)
  25. Supersolidity of cnoidal waves in an ultracold Bose gas
    Giovanni I. Martone, Alessio Recati, Nicolas Pavloff
    Phys. Rev. Research 3, 013143 (2021)

Selected Publications on the different activities

  1. Ferromagnetism in an extended coherently-coupled atomic superfluid
    Riccardo Cominotti, Anna Berti, Clement Dulin, Chiara Rogora, Giacomo Lamporesi, Iacopo Carusotto, Alessio Recati, Alessandro Zenesini, Gabriele Ferrari
    Phys. Rev. X 13, 021037 (2023)
  2. Quantum fluctuations beyond the Gutzwiller approximation in the Bose-Hubbard model
    F. Caleffi, M. Capone, C. Menotti, I. Carusotto, A. Recati
    Phys. Rev. Research 2, 033276 (2020)
  3. Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas
    L. Tanzi, S. M. Roccuzzo, E. Lucioni, F. Famà, A. Fioretti, C. Gabbanini, G. Modugno, A. Recati, S. Stringari
    Nature 574, 382 (2019)
    See also: Nature News&Views, Nat. Phys. Highlights and the related works:
    Guo et al., Nature 574, 386 (2019)
    Natale et al., Phys. Rev. Lett. 123, 050402 (2019)
  4. Collisions of Self-Bound Quantum Droplets
    Giovanni Ferioli, Giulia Semeghini, Leonardo Masi, Giovanni Giusti, Giovanni Modugno, Massimo Inguscio, Albert Gallemí, Alessio Recati, and Marco Fattori
    Phys. Rev. Lett. 122, 090401 (2019)
  5. Andreev-Bashkin effect in superfluid cold gases mixture
    Jacopo Nespolo, Grigori E. Astrakharchik, Alessio Recati
    New J. Phys., 19, 125005 (2017)
  6. Observation of repulsive Fermi polarons in a resonant mixture of ultracold 6Li atoms
    F. Scazza, G. Valtolina, P. Massignan, A. Recati, A. Amico, A. Burchianti, C. Fort, M. Inguscio, M. Zaccanti, G. Roati
    Phys. Rev. Lett. 118, 083602 (2017) - Editor's suggestion
  7. Instability of the superfluid flow as black-hole lasing effect
    S. Finazzi, F. Piazza, M. Abad, A. Smerzi, A. Recati
    Phys. Rev. Lett. 114, 245301 (2015)
  8. A study of coherently coupled two-component Bose-Einstein Condensates
    Marta Abad and Alessio Recati
    Eur. Phys. J D 67, 148 (2013)
  9. Spin fluctuations, susceptibility and the dipole oscillation of a nearly ferromagnetic Fermi gas
    Alessio Recati and Sandro Stringari
    Phys. Rev. Lett. 106, 080402 (2011)
  10. Bogoliubov theory of acoustic Hawking radiation in Bose-Einstein condensates
    A. Recati, N. Pavloff, and I. Carusotto
    Phys. Rev. A 80, 043603 (2009)
  11. Numerical observation of Hawking radiation from acoustic black holes in atomic Bose-Einstein condensates
    I. Carusotto, S. Fagnocchi, A. Recati, R. Balbinot and A. Fabbri
    New J. Phys. 10, 103001 (2008).
    See also the extract in New Scientist:
    NEWS12 MARCH 2008
    Artificial event horizon generates Hawking radiation
  12. Photon energy lifter
    Z. Gaburro, M. Ghulinyan, F. Riboli, L. Pavesi, A. Recati, I. Carusotto
    Optics Express 14 , 7270 (2006)
  13. Normal state of a polarized Fermi gas at unitarity
    C. Lobo, A. Recati, S. Giorgini,S. Stringari
    Phys. Rev. Lett. 97, 200403 (2006)
  14. Atomic quantum dots coupled to a Reservoir of a Superfluid Bose-Einstein condensate
    A. Recati, P.O. Fedichev, W. Zwerger, J. von Delft, P. Zoller
    Phys. Rev. Lett. 94, 040404 (2005)
  15. An exactly solvable model of the BCS-BEC crossover
    J.N. Fuchs, A. Recati, W. Zwerger
    Phys. Rev. Lett. 93, 090408 (2004)
  16. Spin-charge separation in ultra-cold quantum gases
    A. Recati, P. O. Fedichev, W. Zwerger, and P. Zoller
    Phys. Rev. Lett. 90, 020401 (2003)

Contributions to Books and Reviews

  1. Bose–Einstein condensation
    Leonardo Fallani, Massimo Inguscio, Alessio Recati, Sandro Stringari
    Encyclopedia Of Condensed Matter Physics 68 (2024)
  2. Supersolidity in ultracold dipolar gases
    Alessio Recati and Sandro Stringari
    Nature Reviews Physics 10 (2023)
  3. Coherently Coupled Mixtures of Bose-Einstein Condensed Gases
    Alessio Recati, Sandro Stringari
    Annual Review Of Condensed Matter Physics 13 407-432 (2022)
  4. Recati, A. (2016):
    Coherently Coupled Bose gases, in "Quantum Matter at Low Termperature"
    Ed. M. Inguscio, W. Ketterle, S. Stringari and G. Roati
    Proceeding of the international School of Physics "Enirico Fermi", Course 191
  5. Balbinot, R., Carusotto, I., Fabbri, A., Mayoral, C. and Recati, A. (2013):
    Understanding Hawking Radiation from Simple Models of Atomic Bose-Einstein Condensates, in "Analogue Gravity Phenomenology in Analogue Spacetimes and Horizons, from Theory to Experiment"
    Ed. Faccio, D., Belgiorno, F., Cacciatori, S., Gorini, V., Liberati, S., Moschella, U., Lecture Notes in Physics vol.870 (Springer), 181-220.
  6. Recati, A., Stringari, S. (2012):
    Normal phase of Polarized strongly interacting gas, in "The BCS-BEC Crossover and the Unitary Fermi Gas",
    Ed. Zwerger, W., Lecture Notes in Physics vol.836 (Springer), 447-476.

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Office 322 of the INO-CNR BEC Center

Physics Departmen of the University of Trento

Via Sommarive, 14

I - 38123 Povo (Trento)