منابع مشابه
Dissipation in finite Fermi systems
We present a systematic theory of dissipation in finite Fermi systems. This theory is based on the application of periodic orbit theory to linear response of many-body systems. We concentrate only on the mesoscopic aspect of the phenomena wherein a many-body system can be reduced to a single-body in an effective mean-field. We obtain semiclassical periodic-orbit corrections on top of the two-ti...
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Ac-driven asymmetric pulses can be used to control the Fermi acceleration between three different motions, A: the accelerated mode, D: the decelerated mode, and H: the hyperaccelerated mode. In this paper we show that dissipation strongly affects the particles velocity, reducing the possibility for an accurate control of the dynamics. The saturation time, where the mean velocity starts to be co...
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We consider a small and fixed number of fermions (bosons) in a trap. The ground state of the system is defined at T = 0. For a given excitation energy, there are several ways of exciting the particles from this ground state. We formulate a method for calculating the number fluctuation in the ground state using microcanonical counting, and implement it for small systems of noninteracting fermion...
متن کاملGeneric finite-size enhancement of pairing in mesoscopic Fermi systems
M. Farine, F. W. J. Hekking, P. Schuck, and X. Viñas Consulat Général de France à Canton, 339 Huan Shi Dong Lu, 510098 Guangzhou, Canton, China Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS and Université Joseph Fourier, Maison des Magistères, Boı̂te Postal 166, 38042 Grenoble Cedex 9, France Institut de Physique Nucléaire, IN2P3–CNRS, Université Paris–Sud, F-91406 Orsay-Cé...
متن کاملCriteria for the onset of chaos in finite Fermi systems
The level density in a many-particle Fermi system at a given excitation energy is exponentially large with respect to the number of active particles n, and the corresponding mean level spacing D is very small. We consider the eigenstates of the system in the basis of multi-particle excited states constructed of some non-interacting single-particle orbitals. Most of the basis states are not coup...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2000
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(00)00151-2