https://doi.org/10.1007/s100510050897
From semiconductors to superconductors: a simple model for pseudogaps
Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
Corresponding author: a pistoles@ill.fr
Received:
8
December
1998
Published online: 15 August 1999
We consider a two-dimensional semiconductor with a local attraction among the carriers. We study the ground state of this system as a function of the semiconductor gap. We find a direct transition from a superconducting to an insulating phase for no doping at a critical value, the single particle excitations being always gapped. For finite doping we find a smooth crossover. We calculate the critical temperature due to both the particle excitations and the Berezinkii-Kosterlitz-Thouless transition.
PACS: 74.20.-z – Theories and models of superconducting state / 74.20.Fg – BCS theory and its development / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
