Transport through a magnetic impurity: A slave-spin approach

Article

关键词: RENORMALIZATION-GROUP;    KONDO;    DERIVATION;   

DOI  :  10.1103/PhysRevB.99.195409

来源: SCIE

【 摘 要 】

We study transport across a magnetic impurity by means of a recently developed slave-spin technique that does not require any constraint. Within a conserving mean-field approximation we find a conductance that displays both the known zero-bias anomaly and also the expected peak at a bias of order U. We extend the slave-spin mean-field approximation to study the out-of-equilibrium transient evolution of a quantum dot. We apply the method to investigate the time evolution of a quantum dot induced by a time-dependent electrochemical potential applied to the contacts. Similar to the time-dependent Gutzwiller approximation, the mean-field slave-spin dynamics is able to capture dissipation in the leads, so that a steady state is reached after a characteristic relaxation time.

【 授权许可】

Free