Cooling low-dimensional electron systems into the microkelvin regime.
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Authors
van der Vliet, Harriet
Lucas, Marijn
Creeth, Graham
Saunders, John
Publication Date
2022-02-03Journal Title
Nat Commun
ISSN
2041-1723
Publisher
Springer Science and Business Media LLC
Volume
13
Issue
1
Language
eng
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Levitin, L. V., van der Vliet, H., Theisen, T., Dimitriadis, S., Lucas, M., Corcoles, A. D., Nyéki, J., et al. (2022). Cooling low-dimensional electron systems into the microkelvin regime.. Nat Commun, 13 (1) https://doi.org/10.1038/s41467-022-28222-x
Abstract
Two-dimensional electron gases (2DEGs) with high mobility, engineered in semiconductor heterostructures host a variety of ordered phases arising from strong correlations, which emerge at sufficiently low temperatures. The 2DEG can be further controlled by surface gates to create quasi-one dimensional systems, with potential spintronic applications. Here we address the long-standing challenge of cooling such electrons to below 1 mK, potentially important for identification of topological phases and spin correlated states. The 2DEG device was immersed in liquid 3He, cooled by the nuclear adiabatic demagnetization of copper. The temperature of the 2D electrons was inferred from the electronic noise in a gold wire, connected to the 2DEG by a metallic ohmic contact. With effective screening and filtering, we demonstrate a temperature of 0.9 ± 0.1 mK, with scope for significant further improvement. This platform is a key technological step, paving the way to observing new quantum phenomena, and developing new generations of nanoelectronic devices exploiting correlated electron states.
Sponsorship
Engineering and Physical Sciences Research Council (EP/K004077/1)
Identifiers
PMC8814190, 35115494
External DOI: https://doi.org/10.1038/s41467-022-28222-x
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334753
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