%0 Journal Article
%J Correggi, M., Dimonte, D., 2016. On the third critical speed for rotating Bose-Einstein condensates. J. Math. Phys. 57, 71901
%D 2016
%T On the third critical speed for rotating Bose-Einstein condensates
%A Daniele Dimonte
%A Michele Correggi
%X We study a two-dimensional rotating Bose-Einstein condensate confined by an anharmonic trap in the framework of the Gross-Pitaevskii theory. We consider a rapid rotation regime close to the transition to a giant vortex state. It was proven in Correggi et al. [J. Math. Phys. 53, 095203 (2012)] that such a transition occurs when the angular velocity is of order ε−4, with ε−2 denoting the coefficient of the nonlinear term in the Gross-Pitaevskii functional and ε ≪ 1 (Thomas-Fermi regime). In this paper, we identify a finite value Ωc such that if Ω = Ω0/ε4 with Ω0 > Ωc, the condensate is in the giant vortex phase. Under the same condition, we prove a refined energy asymptotics and an estimate of the winding number of any Gross-Pitaevskii minimizer.
%B Correggi, M., Dimonte, D., 2016. On the third critical speed for rotating Bose-Einstein condensates. J. Math. Phys. 57, 71901
%I AIP Publisher
%G en
%U http://urania.sissa.it/xmlui/handle/1963/35246
%1 35557
%2 Mathematics
%$ Submitted by ddimonte@sissa.it (ddimonte@sissa.it) on 2016-10-19T16:34:31Z
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%R 10.1063/1.4954805
%0 Report
%D 2015
%T A class of Hamiltonians for a three-particle fermionic system at unitarity
%A Michele Correggi
%A Gianfausto Dell'Antonio
%A Domenico Finco
%A Alessandro Michelangeli
%A Alessandro Teta
%X We consider a quantum mechanical three-particle system made of two identical fermions of mass one and a different particle of mass $m$, where each fermion interacts via a zero-range force with the different particle. In particular we study the unitary regime, i.e., the case of infinite two-body scattering length. The Hamiltonians describing the system are, by definition, self-adjoint extensions of the free Hamiltonian restricted on smooth functions vanishing at the two-body coincidence planes, i.e., where the positions of two interacting particles coincide. It is known that for $m$ larger than a critical value $m^* \simeq (13.607)^{-1}$ a self-adjoint and lower bounded Hamiltonian $H_0$ can be constructed, whose domain is characterized in terms of the standard point-interaction boundary condition at each coincidence plane. Here we prove that for $m\in(m^*,m^{**})$, where $m^{**}\simeq (8.62)^{-1}$, there is a further family of self-adjoint and lower bounded Hamiltonians $H_{0,\beta}$, $\beta \in \mathbb{R}$, describing the system. Using a quadratic form method, we give a rigorous construction of such Hamiltonians and we show that the elements of their domains satisfy a further boundary condition, characterizing the singular behavior when the positions of all the three particles coincide.
%G en
%U http://urania.sissa.it/xmlui/handle/1963/34469
%1 34644
%2 Mathematics
%4 1
%$ Submitted by Alessandro Michelangeli (alemiche@sissa.it) on 2015-05-21T06:33:20Z
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%0 Journal Article
%J Rev. Math. Phys. 24 (2012), 1250017
%D 2012
%T Stability for a System of N Fermions Plus a Different Particle with Zero-Range Interactions
%A Michele Correggi
%A Gianfausto Dell'Antonio
%A Domenico Finco
%A Alessandro Michelangeli
%A Alessandro Teta
%X We study the stability problem for a non-relativistic quantum system in\\r\\ndimension three composed by $ N \\\\geq 2 $ identical fermions, with unit mass,\\r\\ninteracting with a different particle, with mass $ m $, via a zero-range\\r\\ninteraction of strength $ \\\\alpha \\\\in \\\\R $. We construct the corresponding\\r\\nrenormalised quadratic (or energy) form $ \\\\form $ and the so-called\\r\\nSkornyakov-Ter-Martirosyan symmetric extension $ H_{\\\\alpha} $, which is the\\r\\nnatural candidate as Hamiltonian of the system. We find a value of the mass $\\r\\nm^*(N) $ such that for $ m > m^*(N)$ the form $ \\\\form $ is closed and bounded from below. As a consequence, $ \\\\form $ defines a unique self-adjoint and bounded from below extension of $ H_{\\\\alpha}$ and therefore the system is stable. On the other hand, we also show that the form $ \\\\form $ is unbounded from below for $ m < m^*(2)$. In analogy with the well-known bosonic case, this suggests that the system is unstable for $ m < m^*(2)$ and the so-called Thomas effect occurs.
%B Rev. Math. Phys. 24 (2012), 1250017
%I World Scientific
%G en
%U http://hdl.handle.net/1963/6069
%1 5955
%2 Mathematics
%3 Mathematical Physics
%4 -1
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2012-08-02T07:19:59Z\\nNo. of bitstreams: 1\\n1201.5740v1.pdf: 303047 bytes, checksum: eb2df0afd547514c235422e82f494584 (MD5)
%R 10.1142/S0129055X12500171
%0 Journal Article
%J J. Phys. A 38 (2005) 4769-4781
%D 2005
%T Decay of a bound state under a time-periodic perturbation: a toy case
%A Michele Correggi
%A Gianfausto Dell'Antonio
%X We study the time evolution of a three dimensional quantum particle, initially in a bound state, under the action of a time-periodic zero range interaction with ``strength\\\'\\\' (\\\\alpha(t)). Under very weak generic conditions on the Fourier coefficients of (\\\\alpha(t)), we prove complete ionization as (t \\\\to \\\\infty). We prove also that, under the same conditions, all the states of the system are scattering states.
%B J. Phys. A 38 (2005) 4769-4781
%G en_US
%U http://hdl.handle.net/1963/2298
%1 1718
%2 Mathematics
%3 Mathematical Physics
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2007-10-25T08:22:58Z\\nNo. of bitstreams: 1\\n0408003v2.pdf: 207599 bytes, checksum: 256b29c96ea071184e9455fd1dd92717 (MD5)
%R 10.1088/0305-4470/38/22/002
%0 Journal Article
%J Comm. Math. Phys. 257 (2005) 169-192
%D 2005
%T Ionization for Three Dimensional Time-dependent Point Interactions
%A Michele Correggi
%A Gianfausto Dell'Antonio
%A Rodolfo Figari
%A Andrea Mantile
%X We study the time evolution of a three dimensional quantum particle under the action of a time-dependent point interaction fixed at the origin. We assume that the ``strength\\\'\\\' of the interaction (\\\\alpha(t)) is a periodic function with an arbitrary mean. Under very weak conditions on the Fourier coefficients of (\\\\alpha(t)), we prove that there is complete ionization as (t \\\\to \\\\infty), starting from a bound state at time (t = 0). Moreover we prove also that, under the same conditions, all the states of the system are scattering states.
%B Comm. Math. Phys. 257 (2005) 169-192
%G en_US
%U http://hdl.handle.net/1963/2297
%1 1719
%2 Mathematics
%3 Mathematical Physics
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2007-10-25T08:14:45Z\\nNo. of bitstreams: 1\\n0402011v2.pdf: 306766 bytes, checksum: 7efb2bcceb4c2699d662ae1af9e7dd76 (MD5)
%R 10.1007/s00220-005-1293-x
%0 Journal Article
%J Ann. Henri Poincare 5 (2004) 773-808
%D 2004
%T Rotating Singular Perturbations of the Laplacian
%A Michele Correggi
%A Gianfausto Dell'Antonio
%X We study a system of a quantum particle interacting with a singular time-dependent uniformly rotating potential in 2 and 3 dimensions: in particular we consider an interaction with support on a point (rotating point interaction) and on a set of codimension 1 (rotating blade). We prove the existence of the Hamiltonians of such systems as suitable self-adjoint operators and we give an explicit expression for their unitary semigroups. Moreover we analyze the asymptotic limit of large angular velocity and we prove strong convergence of the time-dependent propagator to some one-parameter unitary group as (\\\\omega \\\\to \\\\infty).
%B Ann. Henri Poincare 5 (2004) 773-808
%I Springer
%G en_US
%U http://hdl.handle.net/1963/2945
%1 1755
%2 Mathematics
%3 Mathematical Physics
%$ Submitted by Andrea Wehrenfennig (andreaw@sissa.it) on 2008-09-15T08:20:31Z\\nNo. of bitstreams: 1\\nmath-ph0307056.pdf: 360658 bytes, checksum: 16a12ce4dfd525b63e0a6e703ef9d7bf (MD5)
%R 10.1007/s00023-004-0182-8
%0 Thesis
%D 2004
%T Time-dependent singular interactions
%A Michele Correggi
%K Rotating singular interactions
%I SISSA
%G en
%U http://hdl.handle.net/1963/5310
%1 5135
%2 Mathematics
%3 Mathematical Physics
%4 -1
%$ Submitted by Maria Pia Calandra (calapia@sissa.it) on 2012-01-31T10:36:04Z\\nNo. of bitstreams: 1\\nCorreggi_PhD.pdf: 7625881 bytes, checksum: 2f2f600f7e0b513322732b8a447ef88d (MD5)
%0 Journal Article
%J Ann.Physics 296 (2002), no.2, 371
%D 2002
%T Quantum mechanics and stochastic mechanics for compatible observables at different times
%A Michele Correggi
%A Giovanni Morchio
%B Ann.Physics 296 (2002), no.2, 371
%I SISSA Library
%G en
%U http://hdl.handle.net/1963/1577
%1 2541
%2 Mathematics
%3 Mathematical Physics
%$ Made available in DSpace on 2004-09-01T13:04:48Z (GMT). No. of bitstreams: 0\\n Previous issue date: 2002
%R 10.1006/aphy.2002.6236