Compression for data archiving and backup revisited
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
We investigate the two-dimensional attractive Hubbard model with quantum Monte Carlo techniques to reveal the crossover from a BCS-type superconductivity in the weak-coupling regime to a superconductivity properly described by a Bose-Einstein condensation (BEC) of local, preformed pairs. The crossover from BCS to BEC is particularly well exposed in the temperature dependence of both the spin susceptibility and the double occupancy, as well as by the appearance of a pseudogap in the density of states far above (Formula presented). These features are also mirrored in the shape of the specific-heat peak around (Formula presented), the separation of the temperature regimes where pair formation and their condensation occur, and in the transfer of spectral weight from the single-particle excitation branch to a pair band in the normal state. © 1996 The American Physical Society.
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
R.J. Gambino, N.R. Stemple, et al.
Journal of Physics and Chemistry of Solids
Daniel J. Coady, Amanda C. Engler, et al.
ACS Macro Letters
I. Morgenstern, K.A. Müller, et al.
Physica B: Physics of Condensed Matter