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

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

2005-03-13

arxiv.org/abs/cond-mat/0503314v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.153314

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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