Magnetic Polarization Currents in Double Quantum Dot Devices

Abstract

We investigate coherent electron transport through a parallel circuit of two quantum dots, each of which has a single tunable energy level. Electrons tunneling via each dot from the left lead interfere with each other at the right lead. It is shown that due to the quantum interference of tunneling electrons the double quantum dot device is magnetically polarized by coherent circulation of electrons on the closed path through the dots and the leads. Varying the energy level of each dot one can make the magnetic states of the device to be either {\em up-}, {\em non-}, or {\em down-} polarization. It is shown that for experimentally accessible temperatures and applied biases the magnetic polarization currents should be sufficiently large to observe with current nanotechnology.

4 pages, 4 figures

References in corpus (3)

• Kondo Correlations and the Fano Effect in Closed AB-Interferometers
• Flux-Dependent Level Attraction in Double-Dot Aharonov-Bohm Interferometers
• Quantum Phase Transition in a Multi-Level Dot

Cited by in corpus (6)

• Phase coherence in the inelastic cotunneling regime
• Externally controlled local magnetic field in a conducting mesoscopic ring coupled to a quantum wire
• Dicke-like effect in spin-polarized transport through coupled quantum dots
• Thermal and Electrical Currents in Nanoscale Electronic Interferometers
• Circulating persistent current and induced magnetic field in a fractal network
• Transport characteristics of a $\mathcal{P}\mathcal{T}$-symmetric non-Hermitian system: Effect of environmental interaction