Results
author = " Marchetti, F.M. "
Spinodal decomposition in polarised Fermi superfluids
Description :
We discuss the dynamics of phase separation through the process of spinodal
decomposition in a Fermi superfluid with population imbalance. We discuss this
instability first in terms of a phenomenological Landau theory. Working within
the mean-field description at zero temperature, we then find the...
Repository :
arXiv
Language(s) :
Undetermined
Stability and pairing in quasi-one-dimensional Bose-Fermi mixtures
Description :
We consider a mixture of single-component bosonic and fermionic atoms in an
array of coupled one-dimensional "tubes". For an attractive Bose-Fermi
interaction, we show that the system exhibits phase separation instead of the
usual collapse. Moreover, above a critical inter-tube hopping, all first-...
Repository :
arXiv
Language(s) :
Undetermined
Propagating wave-packets and quantised currents in coherently driven polariton superfluids
Description :
We study the properties of propagating polariton wave-packets and their
connection to the stability of doubly charged vortices. Wave-packet propagation
and related photoluminescence spectra exhibit a rich behaviour dependent on the
excitation regime. We show that, because of the non-quadratic pola...
Repository :
arXiv
Language(s) :
Undetermined
Vortices in polariton OPO superfluids
Description :
This chapter reviews the occurrence of quantised vortices in polariton
fluids, primarily when polaritons are driven in the optical parametric
oscillator (OPO) regime. We first review the OPO physics, together with both
its analytical and numerical modelling, the latter being necessary for the
desc...
Repository :
arXiv
Language(s) :
Undetermined
Drag in a resonantly driven polariton fluid
Description :
We study the linear response of a coherently driven polariton fluid in the
pump-only configuration scattering against a point-like defect and evaluate
analytically the drag force exerted by the fluid on the defect. When the system
is excited near the bottom of the lower polariton dispersion, the s...
Repository :
arXiv
Language(s) :
Undetermined
Density-wave phases of dipolar fermions in a bilayer
Description :
We investigate the phase diagram of dipolar fermions with aligned dipole
moments in a two-dimensional (2D) bilayer. Using a version of the
Singwi-Tosi-Land-Sjolander scheme recently adapted to dipolar fermions in a
single layer [M. M. Parish and F. M. Marchetti, Phys. Rev. Lett. 108, 145304
(2012)...
Repository :
arXiv
Language(s) :
Undetermined
Parametric spectral correlations in disordered and chaotic structures
Description :
We explore the influence of external perturbations on the energy levels of a
Hamiltonian drawn at random from the Gaussian unitary distribution of Hermitian
matrices. By deriving the joint distribution function of eigenvalues, we obtain
the (n,m)-point parametric correlation function of the initia...
Repository :
arXiv
Language(s) :
Undetermined
Universality of Parametric Spectral Correlations: Local versus Extended Perturbing Potentials
Description :
We explore the influence of an arbitrary external potential perturbation V on
the spectral properties of a weakly disordered conductor. In the framework of a
statistical field theory of a nonlinear sigma-model type we find, depending on
the range and the profile of the external perturbation, two q...
Repository :
arXiv
Language(s) :
Undetermined
Condensation of Cavity Polaritons in a Disordered Environment
Description :
A model for direct two band excitons in a disordered quantum well coupled to
light in a cavity is investigated. In the limit in which the exciton density is
high, we assess the impact of weak `pair-breaking' disorder on the feasibility
of condensation of cavity polaritons. The mean-field phase dia...
Repository :
arXiv
Language(s) :
Undetermined
Superflow of resonantly driven polaritons against a defect
Description :
In the linear response approximation, coherently driven microcavity
polaritons in the pump-only configuration are expected to satisfy the Landau
criterion for superfluidity at either strong enough pump powers or small flow
velocities. Here, we solve non-perturbatively the time dependent
Gross-Pita...
Repository :
arXiv
Language(s) :
Undetermined