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From semiconductors to superconductors: a simple model for pseudogaps |
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| Authors: | P Nozières F Pistolesi |
| Institution: | (1) Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France, FR |
| Abstract: | 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. Received 8 December 1998 |
| Keywords: | 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 ) |
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