Related Experiment Video
Updated: May 30, 2026
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Resonance and phase shift in an open Aharonov-Bohm ring with an embedded quantum dot
Eric R Hedin1, Yong S Joe, Arkady M Satanin
1Center for Computational Nanoscience, Department of Physics and Astronomy, Ball State University, Muncie, IN 47306, USA.
Summary
Electron transport through quantum dots (QDs) is analyzed with a third-terminal probe. Tuning probe coupling controls transmission phase and Aharonov-Bohm oscillations for experimental characterization.
Area of Science:
- Quantum electronics
- Mesoscopic physics
- Solid-state physics
Background:
- Electron transport through quantum dots (QDs) is crucial for quantum computing and spintronics.
- Aharonov-Bohm (AB) rings offer a platform to study quantum interference effects.
- Controlling quantum phenomena via external coupling is key for device applications.
Purpose of the Study:
- To analytically investigate electron transport and phase properties in a quantum dot system.
- To explore the influence of a tunable third-terminal probe on transmission and conductance.
- To examine the interplay between quantum dot properties and Aharonov-Bohm oscillations.
Main Methods:
- Analytical investigation using the tight-binding model.
- Derivation of explicit expressions for transmission and conductance.
- Analysis of electron transport in a quantum dot connected to reservoirs and embedded in an Aharonov-Bohm ring.
Main Results:
- The zero of Fano resonance shifts from the real energy axis with finite coupling, orbiting the pole in the complex energy plane.
- Coupling to the third terminal breaks unitarity and phase-locking.
- The phase of Aharonov-Bohm oscillations can be tuned to match the quantum dot's intrinsic phase.
Conclusions:
- Tunable coupling to a third-terminal probe offers precise control over electron transport and phase properties in quantum dot systems.
- This control facilitates experimental characterization of quantum dot phase responses.
- The findings have implications for designing quantum devices and understanding quantum interference phenomena.
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