Absorption spectrum around nu=1: evidence for a small-size Skyrmion
J G Groshaus1, V Umansky, H Shtrikman
1Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel. j.groshaus@weizmann.ac.il
Abstract:
We measure the absorption spectrum of a two-dimensional electron system (2DES) in a GaAs quantum well in the presence of a perpendicular magnetic field. We focus on the absorption spectrum into the lowest Landau level around nu=1. We find that the spectrum consists of bound electron-hole complexes, trionlike and excitonlike. We show that their oscillator strength is a powerful probe of the 2DES spatial correlations. We find that near nu=1 the 2DES ground state consists of Skyrmions of small size (a few magnetic lengths).
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