Volume 79, Number 4, August 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 July 2007|
Enhanced two-channel Kondo physics in a quantum box device
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
Accepted: 26 June 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.
PACS: 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
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