Doubly Enhanced Skyrmions in .UPSILON.=2 Bilayer Quantum Hall States.
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Skyrmion excitations were measured and compared for the first time in the bilayer quantum Hall (QH) state at the Landau-level filling factor ν =2 and in the monolayer QH state at ν =1. The observed number of flipped spins, N<FONT SIZE="-1"><SUB>spin</SUB></FONT>, is 14 in the bilayer sample with a large tunnelling gap, and N<FONT SIZE="-1"><SUB>spin</SUB></FONT>=7 in the bilayer sample with a small tunnelling gap, while it is N<FONT SIZE="-1"><SUB>spin</SUB></FONT>=7 in the monolayer sample. The difference is interpreted to be due to the interlayer exchange interaction.
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