Perfect spin-filter and quantum-signal generator in a parallel coupled multiple triple-quantum-dots device

Abstract

Electronic transport through a parallel coupled multiple triple-quantum-dots (tQDs) chain is theoretical studied. By producing an energy difference between the site energy of the upper QDs and the down ones and considering a Zeeman splitting, several highly to 100% spin-polarized windows (SPWs) with very steep edges appear in the linear conductance spectra due to the Fano antiresonance. Moreover, if the Dicke resonance is considered, some nearest SPWs with opposite direction of the spin polarization just contact with each other in some suitable conditions. These results strongly support that this multi-tQDs device can serve multiple purposes including perfect spin-filtering and quantum-signal generator. V C 2012 American Institute of Physics.

Analysis of a multiple-quantum-dots embedded ring structure for potential optically-controlled quantum switch or spin filter

“…In the past 20 years, qubits based on different degrees of electrons in quantum dots have been developed, including charge states of electrons 4 , spin states of an electron 5 , and other hybrid states 6 . Spintronics based on quantum dots and its applications on spin-functional devices have attracted broad scientific interests 7 – 10 . Quantum computing schemes based on the spin of quantum dots have been proposed 11 .…”

Flux-driven and geometry-controlled spin filtering for arbitrary spins in aperiodic quantum networks

“…Even in simple forms, QND's, described within a tight binding framework and without consideration of the RSO interaction have been shown to lead to spin filtering effects. 21 The theoretical work done so far is confined mainly to spintronics for electrons. Only recently an idea of having a spin filter for higher spins by engineering the substrate, composed of a periodic array of magnetic atoms, was proposed and analysed in details.…”