Kondo screening suppression by spin-orbit interaction in quantum dots

Abstract

We study the transport properties of a quantum dot embedded in an Aharonov-Bohm ring in the presence of spin-orbit interactions. Using a numerical renormalization group analysis of the system in the Kondo regime, we find that the competition of Aharonov-Bohm and spin-orbit dynamical phases induces a strong suppression of the Kondo state singlet, somewhat akin to an effective intrinsic magnetic field in the system. This effective field breaks the spin degeneracy of the localized state and produces a finite magnetic moment in the dot. By introducing an {\em in-plane} Zeeman field we show that the Kondo resonance can be fully restored, reestablishing the spin singlet and a desired spin filtering behavior in the Kondo regime, which may result in full spin polarization of the current through the ring.

4 pages, 4 figures

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• Engineering the Kondo and Fano effects in double quantum dots
• Kondo effect in spin-orbit mesoscopic interferometers
• Scanning Tunneling Microscope Operating as a Spin-diode
• Kramers polarization in strongly correlated carbon nanotube quantum dots
• Impact of the Rashba Spin Orbit Coupling on $f$-electron Materials
• Proposal for a local heating driven spin current generator
• Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems
• Phase-controlled heat modulation with Aharonov-Bohm interferometers
• Transport in Single Quantum Dots: A Review from Linear Response to Nonlinear Regimes
• Kondo effect in a two-dimensional electron gas in the Persistent Spin Helix regime