Srilekha Saha, Santanu K. Maiti, S. N. Karmakar
We investigate magneto-transport properties of a three-arm mesoscopic ring
where the upper and lower sub-rings are threaded by Aharonov-Bohm fluxes
$\phi_1$ and $\phi_2$, respectively, within a non-interacting electron picture.
A discrete lattice model is used to describe the quantum network in which two
outer arms are subjected to binary alloy lattices and the middle arm contains
identical lattice sites. It is observed that the presence of the middle arm
provides localized states within the band of extended regions and they lead to
the possibility of switching action from the high conducting state to a low one
and vice versa. This behavior is justified by studying persistent current in
the network. Both the total current and individual currents in three separate
branches are computed by using second-quantized approach and our idea can be
utilized to study magnetic response in any complicated quantum network. The
nature of localized eigenstates are also investigated in terms of probability
amplitude in different sites of the geometry.
View original:
http://arxiv.org/abs/1202.1726
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