Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-28
Phys. Rev. B 82, 085325 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 7 figures
Scientific paper
We study the interference between the Fano and Kondo effects in a side-coupled double-quantum- dot system where one of the quantum dots couples to conduction electron bath while the other dot only side-couples to the first dot via antiferromagnetic (AF) spin exchange coupling. We apply both the perturbative renormalization group (RG) and numerical renormalization group (NRG) approaches to study the effect of AF coupling on the Fano lineshape in the conduction leads. With particle-hole symmetry, the AF exchange coupling competes with the Kondo effect and leads to a local spin-singlet ground state for arbitrary small coupling, so called "two-stage Kondo effect". As a result, via NRG we find the spectral properties of the Fano lineshape in the tunneling density of states (TDOS) of conduction electron leads shows double dip-peak features at the energy scale around the Kondo temperature and the one much below it, corresponding to the two-stage Kondo effect; it also shows an universal scaling behavior at very low energies. We find the qualitative agreement between the NRG and the perturbative RG approach. Relevance of our work to the experiments is discussed.
Chung Chung-Hou
Lee Tsung-Han
No associations
LandOfFree
Tunable Fano-Kondo resonance in side-coupled double quantum dot system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tunable Fano-Kondo resonance in side-coupled double quantum dot system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable Fano-Kondo resonance in side-coupled double quantum dot system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-68313