Sharpened Aharanov-Bohm oscillations near resonance in a balanced ring with double quantum dots

• Published in: Journal of computational electronics Vol. 7; no. 3; pp. 280 - 283
• Main Authors: Hedin, Eric R., Joe, Yong S., Satanin, Arkady M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-09-2008; Springer Nature B.V
• Subjects: Balancing; Electrical Engineering; Electronics; Engineering; Magnetic flux; Magnetic resonance; Mathematical analysis; Mathematical and Computational Engineering; Mathematical and Computational Physics; Mechanical Engineering; Monitors; Optical and Electronic Materials; Oscillations; Parameter sensitivity; Quantum dots; Resonance; Schrodinger equation; Schroedinger equation; Theoretical; Quantum dots; Resonances; Aharanov-Bohm rings
• ISSN: 1569-8025; 1572-8137
• DOI: 10.1007/s10825-008-0201-y

In a balanced Aharonov-Bohm ring with an identical quantum dot (QD) in each arm, the transmission amplitude near resonance consists of a zero and pole which can be made to nearly or exactly overlap in the complex-energy plane. This presents a sensitively balanced region of parameter space in which arbitrarily sharp transmission resonance spikes manifest. Analytical results based on a tight-binding solution of the Schrödinger Equation for this system demonstrate the extreme flux sensitivity of the balanced ring in the vicinity of the resonance near the quasi-bound state energy of the QD’s. This effect may have practical applications as a sensitive monitor of magnetic flux.