Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-12-16
Phys. Rev. B 75, 245329 (2007).
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 10 figures
Scientific paper
10.1103/PhysRevB.75.245329
We discuss the physics of a of a spin-1 quantum dot, coupled to two metallic leads and develop a simple model for the temperature dependence of its conductance. Such quantum dots are described by a two-channel Kondo model with asymmetric coupling constants and the spin screening of the dot by the leads is expected to proceed via a two-stage process. When the Kondo temperatures of each channel are widely separated, on cooling, the dot passes through a broad cross-over regime dominated by underscreened Kondo physics. A singular, or non-fermi liquid correction to the conductance develops in this regime. At the lowest temperatures, destructive interference between resonant scattering in both channels leads to the eventual suppression of the conductance of the dot. We develop a model to describe the growth, and ultimate suppression of the conductance in the two channel Kondo model as it is screened successively by its two channels. Our model is based upon large-N approximation in which the localized spin degrees of freedom are described using the Schwinger boson formalism.
Bayani Babak
Coleman Paul
Posazhennikova Anna
No associations
LandOfFree
Conductance of a spin-1 quantum dot: the two-stage Kondo effect 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 Conductance of a spin-1 quantum dot: the two-stage Kondo effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conductance of a spin-1 quantum dot: the two-stage Kondo effect will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-368940