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

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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4 pages, 3 figures included, accepted to PRL

Scientific paper

10.1103/PhysRevLett.84.725

We investigate the double-layer electron system in a parabolic quantum well at filling factor $\nu=2$ 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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