Premium
Superconductivity and Metal–Insulator Phase Transition in a Layered Two‐Dimensional Fermi Gas
Author(s) -
Malozovsky Y. M.,
Fan J. D.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199705)201:1<167::aid-pssb167>3.0.co;2-p
Subject(s) - condensed matter physics , superconductivity , fermi gas , phase diagram , fermi liquid theory , physics , metal–insulator transition , insulator (electricity) , phase transition , fermi level , crossover , electron , materials science , phase (matter) , quantum mechanics , electrical resistivity and conductivity , optoelectronics , artificial intelligence , computer science
Using the Fermi‐liquid approach with vertex corrections, the effects of exchange and correlation are considered in a layered two‐dimensional electron gas. It is shown that the interaction in the particle–hole channel can induce the metal–insulator phase transition when the Fermi momentum is comparable with the inverse interlayer spacing, p F ≈ /1 c . The possibility of superconductivity in the region between the insulator and normal metal phases, taking into account the particle–hole excitations, is discussed. A smooth crossover from weak to strong coupling superconductivity with the decrease of the 2D carrier density is obtained. The results suggest a new way in the explanation of the phase diagram of layered high‐ T c superconductors.