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Transmission through a quantum dot molecule embedded in an Aharonov-Bohm interferometer.

Daniel A Lovey¹, Sergio S Gomez, Rodolfo H Romero

¹Instituto de Modelado e Innovación Tecnológica, CONICET, and Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Avenida Libertad 5500 (3400) Corrientes, Argentina.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|October 6, 2011

Summary

We theoretically investigate quantum dot molecules in an Aharonov-Bohm ring. Magnetic flux can suppress antiresonances, altering electron transmission pathways in quantum devices.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Quantum dot molecules offer unique electronic properties.
Aharonov-Bohm rings are sensitive to magnetic flux.
Understanding transmission in complex quantum systems is crucial.

Purpose of the Study:

To theoretically analyze electron transmission through a quantum dot molecule in an Aharonov-Bohm ring.
To investigate the role of magnetic flux on transmission pathways and antiresonances.
To compare conductance spectra for different device configurations.

Main Methods:

Theoretical modeling of electron transmission.
Decomposition of transmission into path contributions.
Analysis of self-energy interference effects.

Main Results:

Antiresonances originate from path interference.
Magnetic flux can suppress antiresonances.
A flux period of 2Φ₀ appears with molecular pathway opening.
Conductance spectra differ for distinct lead connections.

Conclusions:

Tunable molecular coupling significantly impacts transmission.
Magnetic flux offers control over quantum interference phenomena.
Device geometry influences conductance properties in quantum dot rings.