The European Physical Journal B

, Volume 80, Issue 1, pp 105–114

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


DOI: 10.1140/epjb/e2011-10931-6

Cite this article as:
Dey, M., Maiti, S. & Karmakar, S. Eur. Phys. J. B (2011) 80: 105. doi:10.1140/epjb/e2011-10931-6


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 ϕ, 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 ϕ = ϕ0/2 (ϕ0 = 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.

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Moumita Dey
    • 1
  • Santanu K. Maiti
    • 1
    • 2
  • S. N. Karmakar
    • 1
  1. 1.Theoretical Condensed Matter Physics DivisionSaha Institute of Nuclear PhysicsKolkataIndia
  2. 2.Department of PhysicsNarasinha Dutt CollegeHowrahIndia

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