87 citations · 455 across the 19 of their papers we have counts for
19 papers
Jones-Roberts solitary waves and the onset of rotation in a spherical surface condensate
Noel Cuadra, Alberto Villois, Thomas Gasenzer +1
The nonlinear excitations underlying the onset of rotation in a dilute Bose-Einstein condensate confined to a thin spherical shell are studied. These excitations correspond to soli…
Pseudovorticity of 2+1D optical solitons
Ludovica Falsi, Giuseppe Agostino, Alberto Villois +6
In the hydrodynamic representation of a quantum fluid or optical field, vorticity vanishes wherever the phase is well defined, and is instead localized at phase singularities, or q…
Anomalous correlators, negative frequencies and non-phase-invariant Hamiltonians in random waves
Alberto Villois, Giovanni Dematteis, Yuri V. Lvov +2
We investigate a generic non-phase invariant Hamiltonian model that governs the dynamics of nonlinear dispersive waves. We give evidence that initial data characterized by random p…
Vortex to Rotons Transition in Dipolar Bose-Einstein Condensates
Alberto Villois, Miguel Onorato, Davide Proment
Recent experimental advancements enabled the creation of various systems exhibiting superfluid behavior, with one notable achievement being the development of dipolar Bose-Einstein…
Evidence of 1+1D photorefractive stripe solitons deep in the Kerr limit
Ludovica Falsi, Alberto Villois, Francesco Coppini +3
The Kerr nonlinearity allows for exact analytic soliton solutions in 1+1D. While nothing excludes that these solitons form in naturally-occurring real-world 3D settings as solitary…
Walk-off induced dissipative breathers and dissipative breather gas in microresonators
A. Villois, D. N. Puzyrev, D. V. Skryabin +1
Dissipative solitons in optical microcavities have attracted significant attention in recent years due to their direct association with the generation of optical frequency combs. H…
Bright-soliton frequency combs and dressed states in chi(2) microresonators
D. N. Puzyrev, V. V. Pankratov, A. Villois +1
We present a theory of the frequency comb generation in the high-Q ring microresonators with quadratic nonlinearity and normal dispersion and demonstrate that the naturally large d…
Photon-photon polaritons in chi(2) microresonators
D. V. Skryabin, V. V. Pankratov, A. Villois +1
We consider a high-Q microresonator with nonlinearity under conditions when the coupling rates between the sidebands around the pump and second harmonic exceed the dampin…
Threshold of complexity and Arnold tongues in Kerr ring microresonators
D. V. Skryabin, Z. Fan, A. Villois +1
We show that the threshold condition for two pump photons to convert into a pair of the sideband ones in Kerr microresonators with high-quality factors breaks the pump laser parame…
Universal threshold and Arnold tongues in Kerr ring microresonators
D. V. Skryabin, Z. Fan, A. Villois +1
We report that an instability boundary of a single-mode state in Kerr ring microresonators with ultrahigh quality factors breaks the parameter space span by the pump laser power an…
Irreversible dynamics of vortex reconnections in quantum fluids
Alberto Villois, Davide Proment, Giorgio Krstulovic
We statistically study vortex reconnections in quantum fluids by evolving different realizations of vortex Hopf links using the Gross--Pitaevskii model. Despite the time-reversibil…
Frequency comb generation via cascaded second-order nonlinearities in microresonators
Jan Szabados, Danila N. Puzyrev, Yannick Minet +5
Optical frequency combs are revolutionising modern time and frequency metrology. In the past years, their range of applications has increased substantially, driven by their miniatu…
Frequency combs in a microring optical parametric oscillator
Alberto Villois, Nikita M. Kondratiev, Ingo Breunig +2
We report the soliton frequency comb generation in microring optical parametric oscillators operating in the down-conversion regime and with the simultaneous presence of the $χ^{(2…
Soliton and quasi-soliton frequency combs due to second harmonic generation in microresonators
Alberto Villois, Dmitry V. Skryabin
We report how a doublet of the symmetric oppositely tilted bistable resonance peaks in a microring resonator with quadratic nonlinearity set for generation of the second harmonic c…
Vortex Nucleation Limited Mobility of Free Electron Bubbles in the Gross-Pitaevskii Model of a Superfluid
Alberto Villois, Hayder Salman
We study the motion of an electron bubble in the zero temperature limit where neither phonons nor rotons provide a significant contribution to the drag exerted on an ion moving wit…
(Non)-universality of vortex reconnections in superfluids
Alberto Villois, Giorgio Krstulovic, Davide Proment
An insight into vortex reconnections in superfluids is presented making use of analytical results and numerical simulations of the Gross--Pitaevskii model. Universal aspects of the…
A Vortex Filament Tracking Method for the Gross-Pitaevskii Model of a Superfluid
Alberto Villois, Giorgio Krstulovic, Davide Proment +1
We present an accurate and robust numerical method to track quantized vortex lines in a superfluid described by the Gross-Pitaevskii equation. By utilizing the pseudo-vorticity fie…
Evolution of a superfluid vortex filament tangle driven by the Gross-Pitaevskii equation
Alberto Villois, Davide Proment, Giorgio Krstulovic
The development and decay of a turbulent vortex tangle driven by the Gross-Pitaevskii equation is studied. Using a recently-developed accurate and robust tracking algorithm, all qu…
Scattering of Line-Ring Vortices in a Superfluid
Alberto Villois, Hayder Salman, Davide Proment
We study the scattering of vortex rings by a superfluid line vortex using the Gross-Pitaevskii equation in a parameter regime where a hydrodynamic description based on a vortex fil…