Bound state in the continuum and spin filter in artificial molecules

TL;DR

This paper explores how bound states in the continuum within quantum dot molecules can be utilized to create a spin filter, leveraging Fano effects and magnetic fields to achieve spin polarization.

Contribution

It introduces a novel design for a spin-dependent polarizer based on bound states in the continuum and Fano interference in quantum dot molecules.

Findings

Demonstrates spin-dependent conductance modulation with magnetic field

Shows potential for high spin polarization in quantum dot devices

Provides detailed analysis of gate voltage effects on spin filtering

Abstract

In this paper we study the formation of bound states in the continuum in a quantum dot molecule coupled to leads. Based in the combination of bound states in the continuum and Fano effect, we propose a new design of a spin-dependent polarizer. By lifting the spin degeneracy of the carriers in the quantum dots by means of a magnetic field the system can be used as a spin-polarized device. A detailed analysis of the spin-dependent conductance and spin polarization as a function of the applied magnetic field and gate voltages is carried out.