Momentum distribution of occupation numbers in FeAs-based superconductors

5th International Conference on Mathematical Modeling in Physical Sciences

物理学;数学

Kashurnikov, V.A.^1 ; Krasavin, A.V.^1 ; Zhumagulov, Ya.V.^1

National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), 31 Kashirskoye shosse, Moscow

115409, Russia^1

关键词: Brillouin zones;    Clusters model;    Fe-As based superconductors;    Interaction parameters;    Momentum distributions;    Monte carlo algorithms;    Occupation numbers;    Two-orbital models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/738/1/012020/pdf
DOI  :  10.1088/1742-6596/738/1/012020

来源: IOP

【 摘 要 】

The momentum distribution of charge carriers in two-dimensional FeAs-clusters modeling iron-based superconductors was calculated within the limits of the two-orbital model. The calculation was implemented by use of quantum world-line Monte Carlo algorithm. Matsubara Green's function was calculated for clusters with sizes up to 10x10 FeAs-cells. Profiles of the distributions are presented for the entire Brillouin zone. The data indicate the presence of a jump near the Fermi level, which is the evidence of the Fermi-type distribution. The influence on the momentum distribution of the value of the interaction parameter is discussed.