Gapped electron state in the symmetric Anderson lattice, Kondo insulator state

QUEST Center event
No
Speaker
Prof. Igor Karnaukhov
Date
03/11/2022 - 13:30 - 12:30Add to Calendar 2022-11-03 12:30:00 2022-11-03 13:30:00 Gapped electron state in the symmetric Anderson lattice, Kondo insulator state The Kondo insulator state (KIS) realized in the symmetric Anderson model at half filling is studied in the framework of a mean field approach. It is shown that a Kondo insulator state with doubled lattice period is stabilised, where the gapped electron liquid behaves like a gapless Majorana spin liquid. Local moments of the d-electrons form a static Z2-field in which the band electrons move. The gap  in the quasi-particle excitation spectrum decreases with increasing  external magnetic field and closes at its critical value. The behavior of the electron liquid is studied for an arbitrary dimensionality of the model. The proposed approach leads to a description of KIS without the need to resort to any artificial symmetry breaking.   Conference room on the 0th floor of Resnick building Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Conference room on the 0th floor of Resnick building
Abstract

The Kondo insulator state (KIS) realized in the symmetric Anderson model at half filling is studied in the framework of a mean field approach. It is shown that a Kondo insulator state with doubled lattice period is stabilised, where the gapped electron liquid behaves like a gapless Majorana spin liquid. Local moments of the d-electrons form a static Z2-field in which the band electrons move. The gap  in the quasi-particle excitation spectrum decreases with increasing  external magnetic field and closes at its critical value. The behavior of the electron liquid is studied for an arbitrary dimensionality of the model. The proposed approach leads to a description of KIS without the need to resort to any artificial symmetry breaking.
 

Last Updated Date : 30/10/2022