This article is cited in 1 paper

METHODS OF THEORETICAL PHYSICS

Toward the theory of fermionic condensation

V. A. Khodel<sup>ab

a</sup> National Research Center Kurchatov Institute, Moscow, Russia
^b McDonnell Center for the Space Sciences & Department of PhysicsWashington University, St. Louis, USA

Abstract: The diagrammatic technique elaborated by Belyaev for the theory of a Fermi liquid has been implemented to analyze the behavior of Fermi systems beyond the topological phase transition point, where the fermionic condensate appears. It has been shown that the inclusion of the interaction between the condensate and above-condensate particles leads to the emergence of a gap in the single-particle excitation spectrum of these particles even in the absence of Cooper pairing. Hence, the emergence of this gap in homogeneous electron systems of silicon field-effect structures leads to a metal-insulator phase transition rather than to superconductivity. It has been shown that the same interaction explains the nature of the Fermi arc structure in twodimensional electron systems of cuprates.

Received: 27.02.2017
Revised: 13.03.2017

DOI: 10.7868/S0370274X17080112

 English version: Journal of Experimental and Theoretical Physics Letters, 2017, 105:8, 531–536

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