Phys. Rev. Lett. 97, 116803 (2006) [4 pages]Dependence of Persistent Gaps at Landau Level Crossings on Relative SpinReceived 1 June 2006; published 12 September 2006 We report measurements of the quantum Hall state energy gap at avoided crossings between Landau levels originating from different conduction band valleys in AlAs quantum wells. These gaps exhibit an approximately linear dependence on the magnetic field over a wide range of fields and filling factors. More remarkably, we observe an unexpected dependence of the gap size on the relative spin orientation of the crossing levels, with parallel-spin crossings exhibiting larger gaps than antiparallel-spin crossings. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.116803
DOI:
10.1103/PhysRevLett.97.116803
PACS:
73.21.Fg, 72.80.Ey, 73.43.Qt
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