Quantum Switch and Efficient Spin-Filter in a System Consisting of Multiple Three-Quantum-Dot Rings

Abstract

Using the non-equilibrium Keldysh Green’s function technique, we investigate electron transport properties of a system consisting of multiple three-quantum-dot rings. The conductance as a function of the electron energy is numerically calculated. An antiresonance point emerges in the conductance spectra and evolves into a well-defined insulating band with the increasing number of three-quantum-dot rings. The position of the well-defined insulating band can be modulated by varying the tunneling coupling strength between adjacent three-quantum-dot rings. When an external magnetic flux is introduced, several to 100% spin-polarized windows will occur due to the Zeeman splitting. These results strongly suggest that this device may realize multiple functions including quantum switch and efficient spin filtering.

Tuning the type of charge carriers in N-heterocyclic carbene-based molecular junctions through electrodes*

“…Over the past few years, single molecular electronics has aroused unprecedented interest as a promising alternative to conventional Si-based electronics. [1] Thus far, several remarkable functional single-molecule devices mimicking the functionality of typical electronic components have been theoretically designed and experimentally fabricated, such as single-molecule switches, [2][3][4][5][6][7][8][9] molecular diodes, [10][11][12] and field-effect transistors. [13][14][15] Complementary metal-oxidesemiconductor (CMOS) transistors consisting of p-type and n-type transistors are the fundamental building blocks of the modern semiconductor industry.…”

Propiedades electrónicas de un anillo cuántico elíptico con sección transversal rectangular

“…En un reciente estudio realizado por He et. al (2017), se investigaron las propiedades de transporte electrónico mediante la técnica de la función Keldysh Green para QRs formados por tres puntos cuánticos ubicados en los vértices de un triángulo.…”

Effects of Geometry on the Electronic Properties of Semiconductor Elliptical Quantum Rings

“…Additionally, non-equilibrium Keldysh Green’s functions technique have been used in ref. 48 to investigate transport properties of a system of three quantum dots placed in a ring-like configuration, with prospective applications in quantum switching and efficient spin filtering. Furthermore, a report on the combined effect of temperature and pressure on the electronic and optical properties of excitons in GaAs-based elliptical QRs is currently in press 49 .…”