Antiresonances modulated by magnetic flux in an Aharonov–Bohm ring

✍ Scribed by Hao Chen; Yaoming Shi

• Book ID: 104337806
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 545 KB
• Volume: 262
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00641-6

✦ Synopsis

With or without an inserted quantum dot or an attached side resonator, the transmission behavior of an Aharonov-Bohm Ž . AB ring is investigated in the framework of quantum waveguide theory in the complex-energy plane. The calculated results show that the AB ring possesses antiresonances in the conductance and several kinds of transmission poles in the complex-energy plane. Piercing the ring, magnetic flux causes a series of crossovers among zero-pole pairs, zero-double-pole pairs, peak-double-pole pairs, and peak-pole pairs. With the inserted quantum dot or attached side resonator in one of its arms, the ring produces complicated behaviors in conductance: some of the poles are split into more than two parts. A kind of deformed Fano resonance is found in the conductance of the AB ring with the attached resonator.