Electron Transport through Double Quantum Dot: from SU(4) Kondo to SU(2) Symmetry

• Authors: D. Sztenkiel , R. Świrkowicz
• Languages of publication: EN

Abstracts

EN

Electron transport across two capacitively coupled quantum dots in a parallel geometry is theoretically studied in the non-linear response regime with spin and orbital degrees of freedom taken into account and the Kondo effect induced by on-site and inter-dot Coulomb correlations is analyzed. For a system with each dot symmetrically coupled to a separate set of electrodes a well-defined spin and orbital contributions to zero-bias Kondo resonance are obtained. The Kondo peak splits if spin and/or orbital degeneracies are removed. A suppression of the orbital Kondo anomaly due to orbital asymmetry and channel mixing effects is discussed.

Keywords

EN

73.63.Kv; 72.15.Qm; 73.40.Gk; 73.23.Hk

Discipline

• 72.15.Qm: Scattering mechanisms and Kondo effect(see also 75.20.Hr Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions in magnetic properties and materials)
• 73.23.Hk: Coulomb blockade; single-electron tunneling
• 73.40.Gk: Tunneling(for tunneling in quantum Hall effects, see 73.43.Jn)
• 73.63.Kv: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 2
• Pages: 387-393

Dates

published

2007-08

received

2007-06-09

Contributors

author

D. Sztenkiel

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

R. Świrkowicz

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.112.387