Spin-pairing instabilities at the coincidence of two Landau levels

Details Spin-pairing instabilities at the coincidence of two Landau levels Spin-pairing instabilities at the coincidence of two Landau levels

2002-12-17

arxiv.org/abs/cond-mat/0212422v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.66.241303

The effect of interactions near the coincidence of two Landau levels with opposite spins at filling factor 1/2 is investigated. By mapping to Composite Fermions it is shown that the fluctuations of the gauge field induces an effective attractive Fermion interaction. This can lead to a spin-singlet ground state that is separated from the excited states by a gap. The magnitude of the gap is evaluated. The results are consistent with the recently observed half-polarized states in the FQHE at a fixed filling factor. It is suggested that similar anomalies exist for other spin configurations in degenerate spin-up and spin-down Landau levels. An experiment for testing the spin-singlet state is proposed.

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