Publications (25)
Crystalline droplets with emergent topological color-charge in many-body systems with sign-changing interactions
P. Karpov, F. Piazza
We introduce a novel type of self-bound droplet which carries an emergent color charge. We consider a system of particles hopping on a lattice and interacting via a commensurately…
Dephasing-assisted macrospin transport
S. Iubini, S. Borlenghi, A. Delin +2
Transport phenomena are ubiquitous in physics, and it is generally understood that the environmental disorder and noise deteriorates the transfer of excitations. There are however…
Light-induced quantum droplet phases of lattice bosons in multimode cavities
P. Karpov, F. Piazza
Multimode optical cavities can be used to implement interatomic interactions which are highly tunable in strength and range. For bosonic atoms trapped in an optical lattice, cavity…
Violations of the equivalence principle in a dilaton-runaway scenario
T. Damour, F. Piazza, G. Veneziano
We explore a version of the cosmological dilaton-fixing and decoupling mechanism in which the dilaton-dependence of the low-energy effective action is extremized for infinitely lar…
Multi-cavity strong coupling to an electron spin ensemble: spectral and dark-state signatures
P. Oehrl, B. Pérez González, A. Dunaev +5
Spin ensembles are considered as potential candidates for quantum memory and quantum enhanced sensing applications. Here, we explore the controlled coupling of multiple superconduc…
Cooling nonlinear lattices toward localisation
F. Piazza, S. Lepri, R. Livi
We describe the energy relaxation process produced by surface damping on lattices of classical anharmonic oscillators. Spontaneous emergence of localised vibrations dramatically sl…
Critical velocity of superfluid flow through single barrier and periodic potentials
Gentaro Watanabe, F. Dalfovo, F. Piazza +2
We investigate the problem of an ultracold atomic gas in the superfluid phase flowing in the presence of a potential barrier or a periodic potential. We use a hydrodynamic scheme i…
Vortex-Induced Phase Slip Dissipation in a Toroidal Bose-Einstein Condensate Flowing Through a Barrier
F. Piazza, L. A. Collins, A. Smerzi
We study superfluid dissipation due to phase slips for a BEC flowing through a repulsive barrier inside a torus. The barrier is adiabatically raised across the annulus while the co…
Discrete Breathers in a Realistic Coarse-Grained Model of Proteins
S. Luccioli, A. Imparato, S. Lepri +2
We report the results of molecular dynamics simulations of an off-lattice protein model featuring a physical force-field and amino-acid sequence. We show that localized modes of no…
Cooperatively-enhanced precision of hybrid light-matter sensors
A. Niezgoda, J. Chwedenczuk, T. Wasak +1
We consider a hybrid system of matter and light as a sensing device and quantify the role of cooperative effects. The latter generically enhance the precision with which modificati…
Dynamics of a tunable superfluid junction
L. J. LeBlanc, A. B. Bardon, J. McKeever +5
We study the population dynamics of a Bose-Einstein condensate in a double-well potential throughout the crossover from Josephson dynamics to hydrodynamics. At barriers higher than…
Quintessence as a run-away dilaton
M. Gasperini, F. Piazza, G. Veneziano
We consider a late-time cosmological model based on a recent proposal that the infinite-bare-coupling limit of superstring/M-theory exists and has good phenomenological properties,…
Instability and Vortex Rings Dynamics in a Three-Dimensional Superfluid Flow Through a Constriction
F. Piazza, L. A. Collins, A. Smerzi
We study the instability of a superfluid flow through a constriction in three spatial dimensions. We consider a Bose-Einstein condensate at zero temperature in two different geomet…
Diffusion-limited reactions in crowded environments
N. Dorsaz, C. De Michele, F. Piazza +2
Diffusion-limited reactions (DLR) are usually described within the Smoluchowski theory, which neglects interactions between the diffusing components. We propose a first extension o…
Coexistence of long- and quasi-long range spatial order in 1D quantum quasicrystals
A. Mendoza-Coto, M. Grossklags, J. Stefaniak +2
Quasicrystals exhibit long-range positional order without periodicity, arising from multiple incommensurate wave vectors. In self-assembled quasicrystals, the spontaneous breaking…
Current-Phase Relation of a Bose-Einstein Condensate Flowing Through a Weak Link
F. Piazza, L. A. Collins, A. Smerzi
We study the current-phase relation of a Bose-Einstein condensate flowing through a repulsive square barrier by solving analytically the one dimensional Gross-Pitaevskii equation.…
Slow energy relaxation and localization in 1D lattices
F. Piazza, S. Lepri, R. Livi
We investigate the energy relaxation process produced by thermal baths at zero temperature acting on the boundary atoms of chains of classical anharmonic oscillators. Time-dependen…
Macroscopic Superpositions of Phase States with Bose-Einstein Condensates
F. Piazza, L. Pezze', A. Smerzi
Quantum superpositions of macroscopically distinguishable states having distinct phases can be created with a Bose-Einstein condensate trapped in a periodic potential. The experime…
Magnetic field effects on non-periodic superlattice structures
H. Cruz, F. Piazza, L. Pavesi
A simple numerical method to study the effect of an applied magnetic field on the energy spectrum of non-periodic superlattice structures is presented. The magnetic field could be…
Study of atomic motions in EuBCO using Moessbauer and EXAFS spectroscopies
F. Piazza, E. Abraham, L. Cianchi +4
We report temperature-dependent Moessbauer and EXAFS measurements of atomic mean square displacements on different samples of EuBCO. Our results indicate that the collective atomic…
Enhancing interferometric sensitivity by non-classical light from quantum non-demolition measurements in cavity QED
K. Gietka, T. Wasak, J. Chwedenczuk +2
We propose an enhanced optical interferometer based on tailored non-classical light generated by nonlinear dynamics and projective measurements in a three-level atom cavity QED sys…
Heat wave propagation in a nonlinear chain
F. Piazza, S. Lepri
We investigate the propagation of temperature perturbations in an array of coupled nonlinear oscillators at finite temperature. We evaluate the response function at equilibrium and…
Point-particle method to compute diffusion-limited cellular uptake
A. Sozza, F. Piazza, M. Cencini +2
We present an efficient point-particle approach to simulate reaction-diffusion processes of spherical absorbing particles in the diffusion-limited regime, as simple models of cellu…
Instability of the superfluid flow as black-hole lasing effect
S. Finazzi, F. Piazza, M. Abad +2
We show that the instability leading to the decay of the one-dimensional superfluid flow through a penetrable barrier are due to the black-hole lasing effect. This dynamical instab…
A Multi-path Interferometer with Ultracold Atoms Trapped in an Optical Lattice
J. Chwedenczuk, F. Piazza, A. Smerzi
We study an ultra-cold gas of bosons trapped in a one dimensional -site optical lattice perturbed by a spatially dependent potential , where the unknown coupling…