Volume 79, Number 4, August 2007
Article Number 47004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 19 July 2007
EPL, 79 (2007) 47004
DOI: 10.1209/0295-5075/79/47004

Enhanced two-channel Kondo physics in a quantum box device

Paata Kakashvili1, 2 and Henrik Johannesson3

1  Department of Applied Physics, Chalmers University of Technology - SE-412 96 Göteborg, Sweden
2  Department of Physics and Astronomy, Rice University - Houston, TX 77005, USA
3  Department of Physics, Göteborg University - SE-412 96 Göteborg, Sweden

received 29 April 2007; accepted in final form 26 June 2007; published August 2007
published online 19 July 2007

We propose a design for a one-dimensional quantum box device where the charge fluctuations are described by an anisotropic two-channel Kondo model. The device consists of a quantum box in the Coulomb blockade regime, weakly coupled to a quantum wire by a single-mode point contact. The electron correlations in the wire produce strong backscattering at the contact, significantly increasing the Kondo temperature as compared to the case of non-interacting electrons. By employing boundary conformal field theory techniques we show that the differential capacitance of the box exhibits manifest two-channel Kondo scaling with temperature and gate voltage, uncontaminated by the one-dimensional electron correlations. We discuss the prospect to experimentally access the Kondo regime with this type of device.

71.10.Pm - Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.).
73.21.-b - Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems.
73.23.Hk - Coulomb blockade; single-electron tunneling.

© Europhysics Letters Association 2007