Issue 37, 2022

Magnetoresistance of high mobility HgTe quantum dot films with controlled charging

Abstract

The magnetoresistance of HgTe quantum dot films, exhibiting a well-defined 1Se state charging and a relatively high mobility (1–10 cm2 V−1 s−1), is measured as a function of temperature down to 10 K and controlled occupation of the first electronic state. There is a positive-quadratic magnetoresistance which can be several 100% at low temperature and scales like x(1 − x) where x is the filling fraction of the lowest quantum dot state in the conduction band, 1Se. This positive magnetoresistance is orders of magnitude larger than the effect estimated from mobile carriers and it is attributed to the increased confinement induced by the magnetic field. There is also a negative magnetoresistance of 1–20% from 300 K to 10 K which is rather independent of the fractional occupation, and which follows a negative exponential dependence with the magnetic field. It can be empirically fit with an effective g-factor of ∼55 and it is tentatively attributed to the reduction of barrier heights by the Zeeman splitting of the 1Se state.

Graphical abstract: Magnetoresistance of high mobility HgTe quantum dot films with controlled charging

Supplementary files

Article information

Article type
Paper
Submitted
28 okt 2021
Accepted
18 jan 2022
First published
20 jan 2022

J. Mater. Chem. C, 2022,10, 13771-13777

Author version available

Magnetoresistance of high mobility HgTe quantum dot films with controlled charging

M. Chen, X. Lan, M. H. Hudson, G. Shen, P. B. Littlewood, D. V. Talapin and P. Guyot-Sionnest, J. Mater. Chem. C, 2022, 10, 13771 DOI: 10.1039/D1TC05202K

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