Spin gap in the 2D electron system of GaAs/AlGaAs single heterojunctions in weak magnetic fields

Details Spin gap in the 2D electron system of GaAs/AlGaAs single heterojunctions in weak magnetic fields Spin gap in the 2D electron system of GaAs/AlGaAs single heterojunctions in weak magnetic fields

2004-09-21

arxiv.org/abs/cond-mat/0409549v2

Phys. Rev. B 72, 035344 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

as published

Scientific paper

10.1103/PhysRevB.72.035344

We study the interaction-enhanced spin gaps in the two-dimensional electron gas confined in GaAs/AlGaAs single heterojunctions subjected to weak magnetic fields. The values are obtained from the chemical potential jumps measured by magnetocapacitance. The gap increase with parallel magnetic field indicates that the lowest-lying charged excitations are accompanied with a single spin flip at the odd-integer filling factor nu=1 and nu=3, in disagreement with the concept of skyrmions.

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