Logical XOR gate response in a quantum interferometer: A spin dependent transport

Abstract

We examine spin dependent transport in a quantum interferometer composed of magnetic atomic sites based on transfer matrix formalism. The interferometer, threaded by a magnetic flux $\varphi$, is symmetrically attached to two semi-infinite one-dimensional (1D) non-magnetic electrodes, namely, source and drain. A simple tight-binding model is used to describe the bridge system, and, here we address numerically the conductance-energy and current-voltage characteristics as functions of the interferometer-to-electrode coupling strength, magnetic flux and the orientation of local the magnetic moments associated with each atomic site. Quite interestingly it is observed that, for $\varphi ={\varphi }_0/2$ (${\varphi }_0=ch/e$, the elementary flux-quantum) a logical XOR gate like response is observed, depending on the orientation of the local magnetic moments associated with the magnetic atoms in the upper and lower arms of the interferometer, and it can be changed by an externally applied gate magnetic field. This aspect may be utilized in designing a spin based electronic logic gate.

11 pages, 8 figures

References in corpus (5)

• Networks of quantum nanorings: programmable spintronic devices
• Stability of spintronic devices based on quantum ring networks
• XOR gate response in a mesoscopic ring with embedded quantum dots
• Filtering of spin currents based on ballistic ring
• Quantum oscillations and decoherence due to electron-electron interaction in metallic networks and hollow cylinders

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