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Alessio Recati's Website

I am a physicist working at the INO-CNR BEC Centre in Trento (Italy).




slide Cold Gases

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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Short CV

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Academic career/fellowships/awards

People

Victor Colussi Dr. Victor Colussi

Senior Post-doc: Victor, from the USA, joined our group in August 2020.
e-mail:
phone:

Albert Gallemì Dr. Albert Gallemì

Post-doc: Albert, from Barcelona, joined our group in 2017.
His expertise is the solution of GPE for Bose mixtures and Dipolar gases.
e-mail: algallemi at gmail.com
phone: (+39) 0461 28 3924

Daniele Contessi Mr. Daniele Contessi

PhD (funded by the Q@TN initiative): Daniele started his PhD at the end of 2019. He is a joined student with Prof. Matteo Rizzi in Köln/Jülich
e-mail: daniele.contessi at unitn.it
phone: (+39) 0461 28 3924

Santo Roccuzzo Mr. Santo Maria Roccuzzo

PhD (funded by the Q@TN initiative): Santo joined us at the end of 2018, with a project on Supersolidity and Quantum Droplet
e-mail: santo.roccuzzo at unitn.it
phone: (+39) 0461 28 3924

Donato Romito Mr. Donato Romito

PhD (shared student with Prof. Carlos Lobo, Math Department, Southhampton University, UK): Donato's research focuses on the so called Andreev-Bashkin effect.
e-mail: donato.romito at gmail.com
phone: (+39) 0461 28 3924

Matteo Sighinolfi Mr. Matteo Sighinolfi

PhD (funded by the Q@TN initiative): Matteo joined us at the end of 2018, with a project on Impurity in Cold-Gases as Open Quantum Systems
e-mail: matteo.sighinolfi at unitn.it
phone: (+39) 0461 28 3924

Sebastiano Bresolin Mr. Sebastiano Bresolin

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

News

(Hover on the images for a 2x zoom)

honeycomb of vortices BEC Quantized vortices in dipolar supersolid Bose-Einstein condensed gases

We have characterized quantized vortices in a dipolar Bose-Einstein condensed, focusing on the supersolid regime. We have found in particular that (i) the angular momentum per particle associated with the vortex line is smaller than ℏ, reflecting the reduction of the global superfluidity; (ii) the nucleation in a rotating trap is triggered -- as for a standard condensate -- by the softening of the quadrupole mode; (iii) many vortices can be arranged into a honeycomb structure, which coexists with the triangular geometry of the supersolid lattice and persists during the free expansion of the atomic cloud.
A. Gallemì, S. M. Roccuzzo, S. Stringari, A. Recati, Phys. Rev. A 102, 023322 (2020)

Andreev-Bashkin correlation Linear Response Study of Collisionless Spin Drag

In this work we are concerned with the understanding of the collisionless drag or entrainment between two superfluids, also called Andreev-Bashkin effect, in terms of current response functions. The drag density is shown to be proportional to the cross transverse current-current response function, playing the role of a normal component for the single species superfluid density. We can in this way link the existence of finite entrainment with the exhaustion of the energy-weighted sum rule in the spin channel. The formalism is then used to reproduce some known results for a weakly interacting Bose-Bose mixture. Finally we include the drag effect to determine the beyond mean-field correction on the speed of sound and on the spin dipole excitations for a homogeneous and trapped gas, respectively.
D. Romito, C. Lobo, A. Recati, arXiv:2002.03955

moment of inertia supersolid A quantum Gutzwiller approach for the Bose-Hubbard model

We have developed the equivalent of Bogoliubov theory (for weakly interacting Bose gases) for the Bose-Hubbard model, but starting from the Gutzwiller ansatz. We find that the approach is extremely well suited to calculate the correlations of the systems. The model is benchmarked against the available QMC result. The approach is very promising in order to calculate dynamical properties of the BH model.
F. Caleffi, M. Capone, C. Menotti, I. Carusotto, A. Recati, Phys. Rev. Research 2, 033276 (2020)

moment of inertia supersolid Rotating a Supersolid

A supersolid shows both solid and superfluid properties. By rotating it you can clearly see that the moment of inertia is strongly reduced due to the superfluid irrotational flow. Even when the global superfluid behaviour diseapper the moment of inertia show reduction due to the single droplet (local) superfluidity.
S. M. Roccuzzo, A. Gallemì, A. Recati, S. Stringari, Phys. Rev. Lett. 124, 045702 (2020)

Spin-dipole mode in a trapped Fermi gas near unitarity

We theoretically investigate the spin-dipole oscillation of a strongly interacting Fermi gas in a harmonic trap. We clarify the temperature dependence of the spin-dipole frequency near the unitarity, which is deeply related to the spin susceptibility, as well as pairing correlations. While the spin-dipole frequency coincides with the trap frequency in a non-interacting Fermi gas, it is shown to remarkably be enhanced in the superfluid state, because of the suppression of the spin degree of freedom due to the spin-singlet Cooper-pair formation. In strongly interacting Fermi gases, this enhancement occurs even above the superfluid phase transition temperature, due to the strong pairing correlations.
H. Tajima, A. Recati, Y. Ohashi, Phys. Rev. A 101, 013610 (2020)

Alessio Recati's Pubblications

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Pre-Print

  1. Manipulation of an elongated internal Josephson junction of bosonic atoms
    A. Farolfi, A. Zenesini, D. Trypogeorgos, A. Recati, G. Lamporesi, G. Ferrari
    arXiv:2101.12643
  2. Impurity dephasing in a Bose-Hubbard model
    Fabio Caleffi, Massimo Capone, Ines de Vega, Alessio Recati
    arXiv:2011.04271
  3. 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
    arXiv:2011.04271
  4. Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
    Arko Roy, Miki Ota, Alessio Recati, Franco Dalfovo
    arXiv:2010.01933
  5. Collisionless drag for a one-dimensional two-component Bose-Hubbard model
    Daniele Contessi, Donato Romito, Matteo Rizzi, Alessio Recati
    arXiv:2009.09504
  6. Supersolidity of cnoidal waves in an ultracold Bose gas
    Giovanni I. Martone, Alessio Recati, Nicolas Pavloff
    arXiv:2008.00795
  7. 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
    arXiv:2005.02213
  8. Linear Response Study of Collisionless Spin Drag
    Donato Romito, Carlos Lobo, Alessio Recati
    arXiv:2002.03955

Recent publications

  1. 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)
  2. Quantized vortices in dipolar supersolid Bose-Einstein condensed gases
    A. Gallemì, S. M. Roccuzzo, S. Stringari, A. Recati
    Phys. Rev. A 102, 023322 (2020)
  3. Rotating a supersolid dipolar gas
    S. M. Roccuzzo, A. Gallemì, A. Recati, S. Stringari
    Phys. Rev. Lett. 124, 045702 (2020)
  4. Spin-dipole mode in a trapped Fermi gas near unitarity
    Hiroyuki Tajima, Alessio Recati, Yoji Ohashi
    Phys. Rev. A 101, 013610 (2020)
  5. 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)
  6. Decay of the relative phase domain wall into confined vortex pairs: the case of a coherently coupled bosonic mixture
    Albert Gallemì, Lev P. Pitaevskii, Sandro Stringari, Alessio Recati
    Phys. Rev. A 100, 023607 (2019)
  7. Collisions of Self-Bound Quantum Droplets
    Giovanni Ferioli, Giulia Semeghini, Leonardo Masi, Giovanni Giusti, Giovanni Modugno, Massimo Inguscio, Albert Gallemì, Alessio Recati, and Marco Fattori
    Phys. Rev. Lett. 122, 090401 (2019)
  8. Breaking of Goldstone modes in a two-component Bose-Einstein condensate
    Alessio Recati and Francesco Piazza
    Phys. Rev. B 99, 064505 (2019)
  9. Dynamics of multiple atoms in one-dimensional fields
    Carlo Cascio, Jad C. Halimeh, Ian P. McCulloch, Alessio Recati, Ines de Vega
    Phys. Rev. A 99, 013845 (2019)
  10. Simulation of two-boson bound states using arrays of driven-dissipative coupled linear optical resonators
    Maxim A. Gorlach, Marco Di Liberto, Alessio Recati, Iacopo Carusotto, Alexander N. Poddubny, Chiara Menotti
    Phys. Rev. A 98, 063625 (2018)
  11. Localisation Transition in the Driven Aubry-André Model
    Donato Romito, Carlos Lobo, Alessio Recati
    Eur. Phys. J. D 72, 135 (2018)
  12. Magnetic defects in an unbalanced mixture of two Bose-Einstein condensates
    A. Gallemì, L. P. Pitaevskii, S. Stringari, A. Recati
    Phys. Rev. A 97, 063615 (2018)
  13. Particle-hole character of the Higgs and Goldstone modes in strongly-interacting lattice bosons
    M. Di Liberto, A. Recati, N. Trivedi, I. Carusotto, C. Menotti
    Phys. Rev. Lett. 120, 073201 (2018)
  14. Andreev-Bashkin effect in superfluid cold gases mixture
    Jacopo Nespolo, Grigori E. Astrakharchik, Alessio Recati
    New J. Phys., 19, 125005 (2017)
  15. Coherent Oscillations in Small Fermi Polaron Systems
    Marek Tylutki, G. E. Astrakharchik, Alessio Recati
    Phys. Rev. A 96, 063603 (2017)
  16. Two-body bound and edge states in the extended SSH Bose-Hubbard model
    M. Di Liberto, A. Recati, I. Carusotto, C. Menotti
    EPJST 226, 2571 (2017)
  17. Evidence for ferromagnetic instability in a repulsive Fermi gas of ultracold atoms
    G. Valtolina, F. Scazza, A. Amico, A. Burchianti, A. Recati, T. Enss, M. Inguscio, M. Zaccanti, G. Roati
    Nature Physics 13, 704 (2017)
  18. 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
  19. Casimir forces and quantum friction from Ginzburg radiation in atomic BECs
    Jamir Marino, Alessio Recati, Iacopo Carusotto
    Phys. Rev. Lett. 118, 045301 (2017)

Selected Publications on the different activities

  1. 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)
  2. 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)
  3. Andreev-Bashkin effect in superfluid cold gases mixture
    Jacopo Nespolo, Grigori E. Astrakharchik, Alessio Recati
    New J. Phys., 19, 125005 (2017)
  4. 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
  5. 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)
  6. A study of coherently coupled two-component Bose-Einstein Condensates
    Marta Abad and Alessio Recati
    Eur. Phys. J D 67, 148 (2013)
  7. Spin fluctuations, susceptibility and the dipole oscillation of a nearly ferromagnetic Fermi gas
    Alessio Recati and Sandro Stringari
    Phys. Rev. Lett. 106, 080402 (2011)
  8. Bogoliubov theory of acoustic Hawking radiation in Bose-Einstein condensates
    A. Recati, N. Pavloff, and I. Carusotto
    Phys. Rev. A 80, 043603 (2009)
  9. 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
  10. Photon energy lifter
    Z. Gaburro, M. Ghulinyan, F. Riboli, L. Pavesi, A. Recati, I. Carusotto
    Optics Express 14 , 7270 (2006)
  11. Normal state of a polarized Fermi gas at unitarity
    C. Lobo, A. Recati, S. Giorgini,S. Stringari
    Phys. Rev. Lett. 97, 200403 (2006)
  12. 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)
  13. An exactly solvable model of the BCS-BEC crossover
    J.N. Fuchs, A. Recati, W. Zwerger
    Phys. Rev. Lett. 93, 090408 (2004)
  14. 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

  1. 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
  2. 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.
  3. 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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Physics Department
University of Trento
Via Sommarive, 14
I - 38123 Povo (Trento)