Exchange interaction in an InSb quantum well measured with Landau-level tunneling spectroscopy

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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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 Acceptance:	22 August 2025
Last Modified:	09 Oct 2025 14:18
URI:	https://orca.cardiff.ac.uk/id/eprint/181575

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