Kondo effect modified by Majorana doublet at end of a DIII-class topological superconductor

摘要

By coupling one quantum dot to a normal metal, the Kondo structure is constructed, and then its change is investigated in the case of the dot connected with a DIII-class topological superconductor supporting Majorana doublets at its ends. It is observed that Kondo correlations occur between the localized state in the dot and two continuum states simultaneously, i.e., the continuum state in the metal and the continuum Andreev reflection state between the metal and topological superconductor. This causes the Kondo-model Hamiltonian to be topologically protected by the SU(2)_S ×Z_2~T symmetry. Besides, the system Kondo temperature can be altered via adjusting the structural parameters. This work clarifies the special influence of Majorana doublet on the Kondo effect.