Abstract
We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system. Resonant tunneling causes constructive interference in the nonlinear absorption that leads to an increase of more than an order of magnitude over the maximum absorption in a coupled quantum dot system without tunneling. Resonant tunneling also leads to a narrowing of the linewidth of the absorption peak to a sublinewidth level. Analytical expressions show that the enhanced nonlinear absorption is largely due to the fifth-order nonlinear term. Competition between third- and fifth-order nonlinearities leads to an anomalous dispersion of the total susceptibility.
Highlights
We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system
The main difference between electromagnetically-induced transparency (EIT) and tunneling induced transparency (TIT) is that EIT usually requires an external-field excitation and induced coherence, while TIT originates from tunneling induced coherence which is decided by the structure of the Quantum dots (QD)
We consider a quantum dot molecule (QDM) system where each QDM consists of two dots with different band structures coupled by tunneling[33,34]
Summary
We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system. Resonant tunneling causes constructive interference in the nonlinear absorption that leads to an increase of more than an order of magnitude over the maximum absorption in a coupled quantum dot system without tunneling. Resonant tunneling leads to a narrowing of the linewidth of the absorption peak to a sublinewidth level.
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