Chen, C;
Holmes, SN;
Farrer, I;
Beere, HE;
Ritchie, DA;
(2020)
Suspended two-dimensional electron gases in In₀.₇₅Ga₀.₂₅As quantum wells.
Applied Physics Letters
, 116
(23)
, Article 232106. 10.1063/5.0013902.
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Abstract
We demonstrate that In0.75Ga0.25As quantum wells can be freely suspended without losing electrical quality when the epitaxial strain-relieving buffer layer is removed. In applied magnetic fields, non-dissipative behavior is observed in the conductivity, and a current induced breakdown of the quantum Hall effect shows a lower critical current in the suspended layers due to efficient thermal isolation compared to the non-suspended-control device. Beyond the critical current, background impurity scattering in the suspended two-dimensional channel regions dominates with stochastic, resonant-like features in the conductivity. This device fabrication scheme offers the potential for thermally isolated devices containing suspension-asymmetry-induced, high spin–orbit coupling strengths with reduced electron–phonon interaction behavior but without introducing high levels of disorder in the processing. This work was funded by EPSRC Grant Nos. EP/K004077/1 and EP/R029075/1, UK. We thank Professor Chris Ford for useful discussions.
| Type: | Article |
|---|---|
| Title: | Suspended two-dimensional electron gases in In₀.₇₅Ga₀.₂₅As quantum wells |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0013902 |
| Publisher version: | https://doi.org/10.1063/5.0013902 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Spin-orbit interactions, Two-dimensional electron gas, Quantum wells, Epitaxy, Quantum Hall effect, Stochastic processes, Elementary particle interactions, Phonons, Landau levels |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/10115183 |
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