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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
Published on: November 1, 2013
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Second-order nonlinearity in ladder-plus-Y configuration in double quantum dot structure.
Applied Optics
|December 14, 2016
Summary
This study models second-order nonlinear susceptibility (SONS) in double quantum dots. High SONS and tunable light speed were predicted for advanced optical and quantum applications.
Area of Science:
- Quantum physics
- Solid-state physics
- Optoelectronics
Background:
- Quantum dots exhibit unique optical and electronic properties.
- Nonlinear optical phenomena are crucial for advanced photonic devices.
- Understanding second-order nonlinear susceptibility (SONS) is key to controlling light-matter interactions.
Purpose of the Study:
- To model and numerically study SONS in a ladder-plus-Y double quantum dot structure.
- To investigate the influence of electric fields on SONS.
- To explore potential applications of predicted phenomena.
Main Methods:
- Density matrix theory was employed to formulate the quantum system.
- Orthogonalized plane waves for wetting layer-quantum dot (WL-QD) were used to determine momentum matrix elements.
- Numerical simulations were performed under electric field application.
Main Results:
- Momentum follows the smallest energy difference between states with significant overlap.
- Neglecting the wetting layer (WL) leads to high SONS due to small WL-QD momenta.
- Millimeter waves were predicted, with potential for huge SONS using additional optical fields.
Conclusions:
- The study predicts significant SONS in double quantum dots, tunable with electric fields.
- Predicted phenomena, including tunable light speed (subluminal to superluminal), have broad application potential.
- Applications include advanced optical devices, quantum information processing, imaging, and temporal clocking.
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