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Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field

V. S. Khrapai·E. V. Deviatov·A. A. Shashkin·V. T. Dolgopolov·F. Hastreiter·A. Wixforth·K. L. Campman·A. C. Gossard
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Abstract

We investigate the double-layer electron system in a parabolic quantum well at filling factor $ν=2$ in a tilted magnetic field using capacitance spectroscopy. The competition between two ground states is found at the Zeeman splitting appreciably smaller than the symmetric-antisymmetric splitting. Although at the transition point the system breaks up into domains of the two competing states, the activation energy turns out to be finite, signaling the occurrence of a new insulator-insulator quantum phase transition. We interpret the obtained results in terms of a predicted canted antiferromagnetic phase.

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V. S. Khrapai, E. V. Deviatov, A. A. Shashkin, V. T. Dolgopolov, F. Hastreiter, A. Wixforth, K. L. Campman, A. C. Gossard. 1999-12-08. Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field. https://doi.org/10.1103/physrevlett.84.725

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