9 research outputs found
Feasibility of Experimental Realization of Entangled Bose-Einstein Condensation
We examine the practical feasibility of the experimental realization of the
so-called entangled Bose-Einstein condensation (BEC), occurring in an entangled
state of two atoms of different species. We demonstrate that if the energy gap
remains vanishing, the entangled BEC persists as the ground state of the
concerned model in a wide parameter regime. We establish the experimental
accessibility of the isotropic point of the effective parameters, in which the
entangled BEC is the exact ground state, as well as the consistency with the
generalized Gross-Pitaevskii equations. The transition temperature is
estimated. Possible experimental implementations are discussed in detail.Comment: 6 pages, published versio
BCS-Bose Crossover in Color Superconductivity
It is shown that the onset of the color superconducting phase occurs in the
BCS-BE crossover region.Comment: 5 pages, LaTeX, references adde
A proposal of an orbital-dependent correlation energy functional for energy-band calculations
An explicitly orbital-dependent correlation energy functional is proposed,
which is to be used in combination with the orbital-dependent exchange energy
functional in energy-band calculations. It bears a close resemblance to the
second-order direct and exchange perturbation terms calculated with Kohn-Sham
orbitals and Kohn-Sham energies except that one of the two Coulomb interactions
entering each term is replaced by an effective interaction which contains
information about long-, intermediate-, and short-range correlations beyond
second-order perturbation theory. Such an effective interaction can rigorously
be defined for the correlation energy of the uniform electron liquid and is
evaluated with high accuracy in order to apply to the orbital-dependent
correlation energy functional. The coupling-constant-averaged spin-parallel and
spin-antiparallel pair correlation functions are also evaluated with high
accuracy for the electron liquid. The present orbital-dependent correlation
energy functional with the effective interaction borrowed from the electron
liquid is valid for tightly-binding electrons as well as for nearly-free
electrons in marked contrast with the conventional local density approximation.Comment: 32 pages, 11 figures, and 1 tabl
On massive photons inside a superconductor as follows from London and Ginzburg-Landau theory
A phenomenological derivation in the frame of London's and Ginzburg-Landau theories is given that photons behave inside a superconductor as if they have mass