Doubly Enhanced Skyrmions in $ν=2$ Bilayer Quantum Hall States

N. Kumada, A. Sawada, Z. F. Ezawa, S. Nagahama, H. Azuhata, K. Muraki, T. Saku, Y. Hirayama

Published 2000-04-16Version 1

By tilting the samples in the magnetic field, we measured and compared the Skyrmion excitations in the bilayer quantum Hall (QH) state at the Landau-level filling factor $\nu =2$ and in the monolayer QH state at $\nu =1$. The observed number of flipped spins is $N_s=14$ in the bilayer system with a large tunneling gap, and $N_s=7$ in the bilayer system with a small tunneling gap, while it is $N_s=7$ in the monolayer system. The difference is interpreted due to the interlayer exchange interaction. Moreover, we have observed seemingly preferred numbers $N_s=14,7,1$ for the flipped spins by tilting bilayer samples.