Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.020
Publication date: 7th February 2022
Carriers confined in colloidal nanoplatetelets feel strong Coulomb interactions, enhanced by dielectric confinement and quasi-planar geometry. We review from a theoretical perspective how these interactions make the optoelectronic response diverge from that of quantum dots and even that of quantum wells, thus providing nanoplatelets with characteristic properties. Large exciton[1] (and trion[2]) binding energies, Giant (and Dwarf) Oscillator Strength[3] and radiative Auger processes[4] are some of the effects that can be observed with due material engineering. Special attention is paid to the role of Coulomb repulsions, which make biexcitons behave differently from simpler species, and stimulate the formation of spontaneous magnetic phases in few-electron nanoplatelets.
Further, prospects of exploiting topological effects in colloidal systems are addressed in two systems:
(i) Core/crown nanoplatelets, where carriers localized in the crown are shown to be susceptible of displaying Aharonov-Bohm phenomena;
(ii) Mercury chalcogenide nanoplatelets. Using multi-band k·p theory, we explain why recent experiments with such structures show absorption spectra which are reminiscent of cadmium-based ones, in spite of the inverted band gap these materials present in bulk. Predictions are made on the structural conditions which will permit the formation of topological (surface) states in such systems.
Support from MICINN project CTQ2017-83781-P and Prometeo/2018/098 grant is acknowledged.
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