Multiple-path Quantum Interference Effects in a Double-Aharonov-Bohm Interferometer

• Published in: Nanoscale research letters Vol. 5; no. 7; pp. 1228 - 1235
• Main Authors: Yang, X. F, Liu, Y. S
• Format: Journal Article
• Language: English
• Published: United States New York : Springer-Verlag 22.05.2010; BioMed Central Ltd; SpringerOpen
• Subjects: Aharonov-Bohm interferometer; Fano effects; Quantum dots; Transport properties; Transport properties; Fano effects; Quantum dots; Aharonov-Bohm interferometer
• ISSN: 1931-7573; 1556-276X; 1556-276X
• DOI: 10.1186/1556-276X-5-1228

We investigate quantum interference effects in a double-Aharonov-Bohm (AB) interferometer consisting of five quantum dots sandwiched between two metallic electrodes in the case of symmetric dot-electrode couplings by the use of the Green's function equation of motion method. The analytical expression for the linear conductance at zero temperature is derived to interpret numerical results. A three-peak structure in the linear conductance spectrum may evolve into a double-peak structure, and two Fano dips (zero conductance points) may appear in the quantum system when the energy levels of quantum dots in arms are not aligned with one another. The AB oscillation for the magnetic flux threading the double-AB interferometer is also investigated in this paper. Our results show the period of AB oscillation can be converted from 2π to π by controlling the difference of the magnetic fluxes threading the two quantum rings.