Spin-dependent tunneling into an empty lateral quantum dot

Abstract

Motivated by the recent experiments of Amasha {\it et al.} [Phys. Rev. B {\bf 78}, 041306(R) (2008)], we investigate single electron tunneling into an empty quantum dot in presence of a magnetic field. We numerically calculate the tunneling rate from a laterally confined, few-channel external lead into the lowest orbital state of a spin-orbit coupled quantum dot. We find two mechanisms leading to a spin-dependent tunneling rate. The first originates from different electronic $g$-factors in the lead and in the dot, and favors the tunneling into the spin ground (excited) state when the $g$-factor magnitude is larger (smaller) in the lead. The second is triggered by spin-orbit interactions via the opening of off-diagonal spin-tunneling channels. It systematically favors the spin excited state. For physical parameters corresponding to lateral GaAs/AlGaAs heterostructures and the experimentally reported tunneling rates, both mechanisms lead to a discrepancy of $\sim$10% in the spin up vs spin down tunneling rates. We conjecture that the significantly larger discrepancy observed experimentally originates from the enhancement of the $g$-factor in laterally confined lead.

10 pages, 9 figures

References in corpus (26)

• Spins in few-electron quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
• Electrical control of spin relaxation in a quantum dot
• Spin-orbit coupling effects on quantum transport in lateral semiconductor dots
• Spin-dependent tunnelling through a symmetric barrier
• Spin-dependent resonant tunneling in symmetrical double-barrier structure
• Dynamical spin-electric coupling in a quantum dot
• Spin and Polarized Current from Coulomb Blockaded Quantum Dots
• Electrically tunable g-factors in quantum dot molecular spin states
• Spin Accumulation and Equilibrium Currents at the Edge of 2DEGs with Spin-Orbit Coupling
• Energy Dependent Tunneling in a Quantum Dot
• Anisotropy of spin splitting and spin relaxation in lateral quantum dots
• Evanescent states in 2D electron systems with spin-orbit interaction and spin-dependent transmission through a barrier
• Spin-Dependent Tunneling of Single Electrons into an Empty Quantum Dot
• Polarized Electric Current in Semiclassical Transport with Spin-Orbit Interaction
• The influence of device geometry on many-body effects in quantum point contacts: Signatures of the 0.7 anomaly, exchange and Kondo
• Charge and spin density modulations in semiconductor quantum wires
• Evanescent states in quantum wires with Rashba spin-orbit coupling
• Dynamics of coupled spins in quantum dots with strong spin-orbit interaction
• Manifestation of spin-orbit interaction in tunneling between 2D electron layers
• Spin polarization of electron current through a potential barrier in two-dimensional structures with spin-orbit interaction

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• Detection and measurement of spin-dependent dynamics in random telegraph signals
• Self-sustaining dynamical nuclear polarization oscillations in quantum dots
• Spin dynamics in tunneling decay of a metastable state
• Isotropic and Anisotropic g-factor Corrections in GaAs Quantum Dots
• Difference in charge and spin dynamics in a quantum dot-lead coupled system
• Dipole-like dynamical nuclear spin polarization around a quantum point contact
• Spin-dependent coherent transport in a double quantum dot system