Excitonic Mott transition in type-II quantum dots
Bhavtosh Bansal, M. Hayne, M. Geller, D. Bimberg, V. V. Moshchalkov
TL;DR
This paper investigates the excitonic Mott transition in type-II GaSb/GaAs quantum dots, revealing a transition from excitons to an electron plasma and its magnetic field effects, with implications for quantum dot optoelectronics.
Contribution
It provides experimental evidence of the Mott transition in type-II quantum dots and explores magnetic field effects on high-density electron states.
Findings
Observation of Mott transition from excitons to electron plasma
Magnetic field induces 'freezing' of plasma into magneto-excitons
High excitation power leads to optically inactive states
Abstract
Photoluminescence spectra measured on a type-II GaSb/GaAs quantum dot ensemble at high excitation power indicate a Mott transition from the low density state comprising of spatially-indirect excitons to a high density electron-plasma state. Under the influence of a very high magnetic field, the electron-plasma that is formed at high excitation powers is `frozen-out' into a state of optically inactive magneto-excitons.
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