Confinement in thickness-controlled GaAs polytype nanodots

Nano Letters
Neimantas VainoriusMats-Erik Pistol

Abstract

Polytype nanodots are arguably the simplest nanodots than can be made, but their technological control was, up to now, challenging. We have developed a technique to produce nanowires containing exactly one polytype nanodot in GaAs with thickness control. These nanodots have been investigated by photoluminescence, which has been cross-correlated with transmission electron microscopy. We find that short (4-20 nm) zincblende GaAs segments/dots in wurtzite GaAs confine electrons and that the inverse system confines holes. By varying the thickness of the nanodots we find strong quantum confinement effects which allows us to extract the effective mass of the carriers. The holes at the top of the valence band have an effective mass of approximately 0.45 m0 in wurtzite GaAs. The thinnest wurtzite nanodot corresponds to a twin plane in zincblende GaAs and gives efficient photoluminescence. It binds an exciton with a binding energy of roughly 50 meV, including central cell corrections.

References

Feb 15, 1994·Physical Review. B, Condensed Matter·M Murayama, T Nakayama
Feb 16, 2008·Nano Letters·Jiming BaoLars Samuelson
Nov 8, 2012·Nano Letters·Lyubomir AhtapodovHelge Weman

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Citations

Jan 26, 2016·Nano Letters·Maaike Bouwes BavinckVal Zwiller
Dec 22, 2015·Nano Letters·Heidi PottsAnna Fontcuberta i Morral
Nov 6, 2015·Nano Letters·S AssaliE P A M Bakkers
Mar 18, 2016·Nature·Daniel JacobssonFrances M Ross
Mar 24, 2016·Nano Letters·Neimantas VainoriusMats-Erik Pistol
Oct 13, 2015·Nano Letters·Bernhard LoitschJonathan J Finley
Nov 4, 2017·Nanotechnology·Douglas Soares OliveiraMonica A Cotta
Dec 6, 2018·Nanotechnology·Luca FrancavigliaAnna Fontcuberta I Morral
Jan 15, 2016·Nanoscale·Sepideh Gorji GhalamestaniKimberly A Dick
Jan 22, 2020·Scientific Reports·L LeandroN Akopian
Jan 6, 2018·Nanoscale·Neimantas VainoriusMats-Erik Pistol
May 15, 2020·Optics Express·Neimantas VainoriusMats-Erik Pistol
Jan 22, 2021·Nanoscale Research Letters·Xiaomei YaoPingping Chen
Sep 30, 2017·ACS Nano·Johan Valentin KnutssonAnders Mikkelsen
Mar 20, 2019·Nano Letters·Sebastian LehmannMagnus T Borgström
Sep 12, 2017·Nano Letters·S AssaliJ E M Haverkort
Jan 9, 2019·Nano Letters·Erik K MårtenssonJonas Johansson
Apr 19, 2019·Chemical Reviews·Lucas GüniatAnna Fontcuberta I Morral

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