Jain, AK;
Nicholls, JT;
Holmes, SN;
Jaliel, G;
Chen, C;
Farrer, I;
Ritchie, DA;
(2026)
The heating and cooling of 2D electrons at low temperatures.
Applied Physics Letters
, 128
(2)
, Article 022105. 10.1063/5.0296043.
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Abstract
We present measurements of the cooling length ℓE for hot electrons in a GaAs-based high-mobility two-dimensional electron gas. The thermal measurements are performed on a long 60 μm-wide channel, which is Joule-heated at one end, along which there are three similar hot-electron thermocouples, spaced 30 μm apart. The thermocouples measure an exponentially decaying temperature profile with a characteristic length ℓE, which decreases from 23 to 16 μm as the lattice temperature increases from 1.8 to 5 K. From a simple one-dimensional model of heat diffusion, we measure an inelastic scattering time, which decreases from τi≈360 to 180 ps. The measured τi has a magnitude and temperature dependence consistent with acoustic phonon scattering times. We discuss how the sample design can be varied for further thermal investigations. Knowledge of the temperature profile and its gradient will prove useful in measurements of the thermal conductivity and the Nernst effect.
| Type: | Article |
|---|---|
| Title: | The heating and cooling of 2D electrons at low temperatures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0296043 |
| Publisher version: | https://doi.org/10.1063/5.0296043 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. It has been made open access under the Creative Commons (CC BY) licence under the terms of the UCL Intellectual Property (IP) Policy and UCL Publications Policy. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10220188 |
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