The bilayer quantum Hall (QH) state at the filling factor ν = 1 shows various fascinating quantum phenomena due to the layer degree of freedom called 'pseudospin'. We report an experimental evidence of the soliton lattice (SL) phase, which is a domain structure of pseudospin, by the appearance of a local maximum of magnetoresistance near the ν = 1 QH state. We investigate the stability of the SL phase by changing B∥ and the total electron density nT. Detailed magnetotransport measurements under tilted magnetic fields were carried out to obtain a B∥-nT plane phase diagram containing the C, IC and SL phases. We found the SL phase is only stable at low nT region. Namely, the C-SL-IC phase transition occurs only at low nT region as B∥ increases. On the contrary, the C-IC phase transition directly occurs without passing through the SL phase at high nT region.
|Number of pages||4|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|Publication status||Published - 2006 Aug|
- Domain wall
- Phase transition
- Quantum Hall effect
- Soliton lattice