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Anti-crossings of spin-split Landau levels in an InAs two-dimensional electron gas with spin-orbit coupling

W. Desrat·F. Giazotto·V. Pellegrini·M. Governale·F. Beltram·F. Capotondi·G. Biasiol·L. Sorba
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Abstract

We report tilted-field transport measurements in the quantum-Hall regime in an InAs/In_0.75Ga_0.25As/In_0.75Al_0.25As quantum well. We observe anti-crossings of spin-split Landau levels, which suggest a mixing of spin states at Landau level coincidence. We propose that the level repulsion is due to the presence of spin-orbit and of band-non-parabolicity terms which are relevant in narrow-gap systems. Furthermore, electron-electron interaction is significant in our structure, as demonstrated by the large values of the interaction-induced enhancement of the electronic g-factor.

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W. Desrat, F. Giazotto, V. Pellegrini, M. Governale, F. Beltram, F. Capotondi, G. Biasiol, L. Sorba. 2005-03-13. Anti-crossings of spin-split Landau levels in an InAs two-dimensional electron gas with spin-orbit coupling. https://doi.org/10.1103/physrevb.71.153314

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