Doubly Enhanced Skyrmions in $\nu =2$ Bilayer Quantum Hall States

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

doi:10.1143/JPSJ.69.3178

Doubly Enhanced Skyrmions in $\nu =2$ Bilayer Quantum Hall States

Mesoscale and Nanoscale Physics 2009-10-31 v1 Strongly Correlated Electrons

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

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Abstract

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.

Keywords

Skyrmions bilayer quantum Hall Landau-level filling factor tunneling gap interlayer exchange interaction flipped spins spin texture

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@article{arxiv.cond-mat/0004259,
  title  = {Doubly Enhanced Skyrmions in $\nu =2$ Bilayer Quantum Hall States},
  author = {N. Kumada and A. Sawada and Z. F. Ezawa and S. Nagahama and H. Azuhata and K. Muraki and T. Saku and Y. Hirayama},
  journal= {arXiv preprint arXiv:cond-mat/0004259},
  year   = {2009}
}

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4 pages, 4 figures

Doubly Enhanced Skyrmions in $\nu =2$ Bilayer Quantum Hall States

Abstract

Keywords

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