2012/02/29 by Srilekha Saha, Santanu K. Maiti, S. N. Karmakar +1
Physics and Astronomy · #Condensed matter physics #Electron #Formalism (music) #Lattice (music) #Magnetic field #Mesoscopic physics #Persistent current #Physics #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum optics and atomic interactions #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1140/epjb/e2012-30163-6
published as The European Physical Journal B, Volume 85, Number 8, Page 283 (2012) · 7 pages, 9 figures
arxiv created 2012/06/19 · openalex publication_date 2012/08/01 · arxiv updated 2013/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate magneto-transport properties of a θ shaped three-arm mesoscopic ring where the upper and lower sub-rings are threaded by Aharonov-Bohm fluxes ϕ1 and ϕ2, 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 while the middle arm contains identical atomic sites. It is observed that the presence of the middle arm provides localized states within the band of extended regions and lead to the possibility of switching action from a high conducting state to a low conducting 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 formalism and our idea can be utilized to study magnetic response in any complicated quantum network. The nature of localized eigenstates are also investigated from probability amplitudes at different sites of the quantum device.