Clowes, S. K., Allford, C. P.  ORCID: https://orcid.org/0000-0002-3798-9014, Shearer, D., Smith, G. V., Simmons, R., Murdin, B. N., Zeitler, U. and Buckle, P. D. ORCID: https://orcid.org/0000-0001-9508-7783
2025.
Exchange interaction in an InSb quantum well measured with Landau-level tunneling spectroscopy.
Physical Review Letters
135
, 146301.
10.1103/rr3f-3zhd
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Official URL: https://doi.org/10.1103/rr3f-3zhd
Abstract
We studied InSb quantum well devices using Landau-level tunneling spectroscopy through a three-terminal differential conductance technique. This method is similar to filled-state scanning tunneling microscopy but uses a stationary contact instead of a mobile tip to analyze the two-dimensional electron system. Applying magnetic fields up to 15 T, we identified clear peaks in the differential current-voltage profiles, indicative of Landau-level formation. By examining deviations from the expected Landau fan diagram, we extract an absolute value for the exchange-induced energy shift. Through an empirical analysis, we derive a formula describing the exchange shift as a function of both magnetic field strength and electron filling.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | American Physical Society |
| ISSN: | 0031-9007 |
| Date of First Compliant Deposit: | 14 November 2025 |
| Date of Acceptance: | 22 August 2025 |
| Last Modified: | 14 Nov 2025 10:00 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/181575 |
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