Exchange cotunneling through quantum dots with spin-orbit coupling

Abstract

We investigate the effects of spin-orbit interaction (SOI) on the exchange cotunneling through a spinful Coulomb blockaded quantum dot. In the case of zero magnetic field, Kondo effect is shown to take place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, we find that the breaking of time-reversal symmetry in a finite field has a marked influence on the effective Anderson, and Kondo models for a single level. The nonlinear conductance can now be asymmetric in bias voltage and may depend strongly on direction of the magnetic field. A measurement of the angle dependence of finite-field cotunneling spectroscopy thus provides valuable information about orbital, and spin degrees of freedom and their mutual coupling.

5 pages, 2 figures

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Cited by in corpus (19)

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• Observation of spin-selective tunneling in SiGe nanocrystals
• A phonon laser utilizing quantum-dot spin states
• Non-equilibrium transport through quantum dots with Dzyaloshinsky--Moriya--Kondo interaction
• Charge fluctuations in nonlinear heat transport
• Tuning the two-electron hybridization and spin states in parallel-coupled InAs quantum dots
• Interplay of Coulomb interaction and spin-orbit effects in multi-level quantum dots
• Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field
• Kondo Spin Screening Cloud in Two-dimensional Electron Gas with Spin-orbit Couplings
• Singlet-triplet avoided crossings and effective $g$ factor versus spatial orientation of spin-orbit-coupled quantum dots
• Flavor fluctuations in 3-level quantum dots: Generic SU(3)-Kondo fixed point in equilibrium and non-Kondo fixed points in nonequilibrium
• Interplay between Kondo tunneling and Rashba precession
• Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy
• The Kondo Temperature of a Two-dimensional Electron Gas with Rashba Spin-orbit Coupling
• The generic fixed point model for pseudo-spin-1/2 quantum dots in nonequilibrium: Spin-valve systems with compensating spin polarizations
• Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots
• Kondo effect in a Aharonov-Casher interferometer
• Coherent and Dissipative Spin Torques in Quantum Dots: A Unified Framework for Quantum Spin Dynamics