Showing papers by "Ferran Mazzanti published in 2002"
TL;DR: The ground-state wave function of a one-body Schrodinger equation with a real potential is real, does not change sign, and is non-degenerate as mentioned in this paper.
Abstract: The variational principle is used to show that the ground-state wave function of a one-body Schrodinger equation with a real potential is real, does not change sign, and is nondegenerate. As a consequence, if the Hamiltonian is invariant under rotations and parity transformations, the ground state must have positive parity and zero angular momentum.
12 citations
TL;DR: In this paper, a detailed discussion of the dynamic susceptibility of the two dimensional free Fermi gas at zero and finite temperature is presented, where the behaviour and evolution of the coherent and incoherent components of dynamic structure function with the temperature and momentum transfer are analyzed.
Abstract: A detailed discussion of the dynamic susceptibility of the two dimensional free Fermi gas at zero and finite temperature is presented. The behaviour and evolution of the coherent and incoherent components of the dynamic structure function with the temperature and momentum transfer are analyzed. Particular attention is paid to the way in which their relative contribution changes with respect to the ~T=0 case. The influence of thermal effects on the lowest order sum rules of the coherent and incoherent responses is also discussed. Finally, similar analysis are presented for the real part of the dynamic susceptibility.
1 citations