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We observe a dramatic reduction in the degree of spin-polarization of atwo-dimensional electron gas in a magnetic field when the Fermi energy movesoff the mid-point of the spin-gap of the lowest Landau level, $\nu=1$. Thisrapid decay of spin alignment to an unpolarized state occurs over small changesto both higher and lower magnetic field. The degree of electron spinpolarization as a function of $\nu$ is measured through the magneto-absorptionspectra which distinguish the occupancy of the two electron spin states. Thedata provide experimental evidence for the presence of Skyrmion excitationswhere exchange energy dominates Zeeman energy in the integer quantum Hallregime at $\nu=1$

physical review letters

Evidence of Skyrmion Excitations about<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ν</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mn /></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">n</mml:mi></mml:math>-Modulation-Doped Single Quantum Wells by Interband Optical Transmission

Evidence of Skyrmion Excitations aboutν=1inn-Modulation-Doped Single Quantum Wells by Interband Optical Transmission