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.

8 pages, 5 figures, revised version as published

References in corpus (6)

• Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
• A finite-frequency functional RG approach to the single impurity Anderson model
• A novel approach to transport through correlated quantum dots
• Kondo physics in transport through a quantum dot with Luttinger liquid leads
• Spin-polarized currents through interacting quantum wires with nonmagnetic leads
• Spin-orbit coupling effects in one-dimensional ballistic quantum wires

Cited by in corpus (3)

• Josephson current through interacting double quantum dots with spin-orbit coupling
• Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
• Interplay of Coulomb interaction and spin-orbit effects in multi-level quantum dots