Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD

Abstract

A double quantum dot device, connected to two channels that only see each other through interdot Coulomb repulsion, is analyzed using the numerical renormalization group technique. By using a two-impurity Anderson model, and parameter values obtained from experiment [S. Amasha {\it et al.}, Phys. Rev. Lett. {\bf 110}, 046604 (2013)], it is shown that, by applying a moderate magnetic field, and adjusting the gate potential of each quantum dot, opposing spin polarizations are created in each channel. Furthermore, through a well defined change in the gate potentials, the polarizations can be reversed. This polarization effect is clearly associated to a spin-orbital Kondo state having a Kondo peak that originates from spatially separated parts of the device. This fact opens the exciting possibility of experimentally probing the internal structure of an SU(2) Kondo state.

4+ pages; 4 figures; supplemental material (1 page, 2 figures)

References in corpus (10)

• Orbital Kondo effect in carbon nanotubes
• Observation of the two-channel Kondo effect
• Observation of the SU(4) Kondo state in a double quantum dot
• Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots
• Ballistic Spin Resonance
• Electrical generation of pure spin currents in a two-dimensional electron gas
• Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot
• Renormalization group study of capacitively coupled double quantum dots
• Full electrostatic control over polarized currents through spin-orbital Kondo effect
• Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD

Cited by in corpus (8)

• The SU(4) Kondo effect in double quantum dots with ferromagnetic leads
• Spin-orbital and spin Kondo effects in parallel coupled quantum dots
• Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD
• The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem
• Orbital Kondo effect in a parallel double quantum dot
• Capacitive interactions and Kondo effect tuning in double quantum impurity systems
• SU(4) Kondo entanglement in double quantum dot devices
• Electron-phonon interaction and electronic correlations in transport through electrostatically and tunnel coupled quantum dots