Observation of Quantum Hall Valley Skyrmions

Details Observation of Quantum Hall Valley Skyrmions Observation of Quantum Hall Valley Skyrmions

2005-05-05

arxiv.org/abs/cond-mat/0505118v1

Phys. Rev. Lett. 95, 066809 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.066809

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 $\nu$ = 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 $\nu=1$ are "valley Skyrmions".

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