Phys. Rev. Lett. 95, 066809 (2005) [4 pages]Observation of Quantum Hall “Valley Skyrmions”Received 5 May 2005; published 5 August 2005 We report measurements of the interaction-induced quantum Hall effect in a spin-polarized AlAs two-dimensional electron system where the electrons occupy two in-plane conduction band valleys. Via the application of in-plane strain, we tune the energies of these valleys and measure the energy gap of the quantum Hall state at filling factor ν=1. The gap has a finite value even at zero strain and, with strain, rises much faster than expected from a single-particle picture, suggesting that the lowest energy charged excitations at ν=1 are “valley Skyrmions.” © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.066809
DOI:
10.1103/PhysRevLett.95.066809
PACS:
73.43.−f, 73.21.−b, 71.70.Fk
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