Cooling Low-Dimensional Electron Systems into the Microkelvin Regime

Lev Levitin, Harriet van der Vliet, Terje Theisen, Stefanos Dimitriadis, Marijn Lucas, Antonio Corcoles-Gonzalez, Jan Nyeki, Andrew Casey, Graham Creeth, Ian Farrer, Dave Ritchie, James Nicholls, John Saunders

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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 3 He, cooled by the nuclear adiabatic demagnetization of copper. The temperature of the 2D electrons was in-
ferred 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.
Original languageEnglish
Article number667
JournalNature Communications
Publication statusPublished - 3 Feb 2022

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