Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-12
The European Physical Journal B, Volume 80, Page 105 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 8 figures
Scientific paper
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 $\phi$, 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 $\phi=\phi_0/2$ ($\phi_0=ch/e$, 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.
Dey Moumita
Karmakar S. N.
Maiti Santanu K.
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