Time-dependent transport through quantum-impurity systems with Kondo resonance

We investigate the time-dependent transport properties of single and double quantum-impurity systems based on the hierarchical equations of motion (HEOM) approach. In the Kondo regime, the dynamical current oscillates with time in both cases due to the temporal coherence of electrons tunneling throu...

Full description

Saved in:
Bibliographic Details
Published in:New journal of physics 2015-03, Vol.17 (3), p.33009
Main Authors: Cheng, YongXi, Hou, WenJie, Wang, YuanDong, Li, ZhenHua, Wei, JianHua, Yan, YiJing
Format: Article
Language:English
Subjects:
71.27.+a
72.15.Qm
Amplitudes
Attenuation
Coupling
Dynamical systems
Dynamics
Electron tunneling
Equations of motion
hierarchical equations of motion
Impurities
Kondo effect
Kondo resonance
Oscillations
Physics
quantum-impurity systems
Resonance
Time dependence
time-dependent transport
Transport properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the time-dependent transport properties of single and double quantum-impurity systems based on the hierarchical equations of motion (HEOM) approach. In the Kondo regime, the dynamical current oscillates with time in both cases due to the temporal coherence of electrons tunneling through the device, which shares the same mechanism as the single-level resonance without e-e interactions, but shows some different characteristics. For single quantum-impurity systems, the temperature T has an inhibitory effect on the oscillations of dynamic current through its suppression of the Kondo effects. The amplitude of the current oscillations is attenuated by the e-e interaction U in the Kondo regime. The frequency of the current oscillations is found almost independent of T and U. For parallel-coupling double quantum-impurity systems, the oscillation of the current shows similar behavior to the single one, but with two-to-three times larger amplitudes. At the limit of small inter-impurity coupling the oscillation of the current exhibits enhanced characters, while it is weakened at the other limit.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/3/033009