Spin polarization measurement is important for the study of a variety of spin states in quantum Hall system. Kerr rotation is proportional to spin polarization, so we developed a high sensitive measurement of Kerr rotation by using homodyne detection and a variety of modulation techniques. Furthermore, we developed Kerr rotation spectra measurement system base on the multi-channel homodyne detection, which enables the assignment of the optical transitions and semi-quantitative estimation of spin polarization by integrating the spectra over the specific optical transition. The spin polarization presents a rapid spin depolarization on both sides of ν= 1 due to Skyrmionic excitation. However the top of spin polarization presents a narrow flat region. Furthermore the spin polarization around ν=3 also shows a rapid spin depolarization which suggest the existence of Skyrmion at higher odd filling factor.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2011|
|Event||19th International Conference on the Application of High Magnetic Fields in Semiconductor Physics and Nanotechnology, HMF-19 - Fukuoka, Japan|
Duration: 2010 Aug 1 → 2010 Aug 6
ASJC Scopus subject areas
- Physics and Astronomy(all)