Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field

Abstract

We study electron transport through a serial double quantum dot with Rashba spin-orbit interaction (SOI) and Zeeman field of amplitude B in presence of local Coulomb repulsion. The linear conductance as a function of a gate voltage Vg equally shifting the levels on both dots shows two B=0 Kondo ridges which are robust against SOI as time-reversal symmetry is preserved. Resulting from the crossing of a spin-up and a spin-down level at vanishing SOI two additional Kondo plateaus appear at finite B. They are not protected by symmetry and rapidly vanish if the SOI is turned on. Left-right asymmetric level-lead couplings and detuned on-site energies lead to a simultaneous breaking of left-right and bonding-anti-bonding state symmetry. In this case the finite-B Kondo ridges in the Vg-B plane are bent with respect to the Vg-axis. For the Kondo ridge to develop different level renormalizations must be compensated by adjusting B.

arXiv comment8 pages, 5 figures, revised version as published

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• Josephson current through interacting double quantum dots with spin-orbit coupling
• Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
• Supercurrent through a serial quantum dot close to singlet-triplet degeneracy
• Non-equilibrium transport through quantum dots with Dzyaloshinsky--Moriya--Kondo interaction
• Blocking transport resonances via Kondo entanglement in quantum dots
• Interplay of Coulomb interaction and spin-orbit effects in multi-level quantum dots
• Magnetic field induced mixed-level Kondo effect in two-level systems