Cooling Low-Dimensional Electron Systems into the Microkelvin Regime. / Levitin, Lev; van der Vliet, Harriet; Dimitriadis, Stefanos; Theisen, Terje; Lucas, Marijn; Corcoles-Gonzalez, Antonio; Nyeki, Jan; Casey, Andrew; Creeth, Graham; Farrer, Ian ; Ritchie, Dave .

In: Nature Communications, 21.09.2021.

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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 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
JournalNature Communications
Publication statusSubmitted - 21 Sep 2021
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 43733715