Abstract
We have measured the diagonal conductivity, [Formula presented], in the microwave regime of an ultrahigh mobility two dimensional electron system. We find a sharp resonance in [Formula presented] versus frequency when [Formula presented] and the partial filling of the highest Landau level, [Formula presented], is [Formula presented] or [Formula presented] and temperatures [Formula presented]. The resonance appears for a range of [Formula presented] from 0.20 to 0.38 and again from 0.64 to 0.80. The peak frequency [Formula presented] changes from [Formula presented] to [Formula presented] as [Formula presented] is approached. This range of [Formula presented] shows no dependence on [Formula presented] where the resonance is observed. The quality factor, [Formula presented], of the resonance is maximum at about [Formula presented] and 0.74. We interpret the resonance as due to a pinning mode of the bubble phase crystal.
Original language | English (US) |
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Journal | Physical review letters |
Volume | 89 |
Issue number | 13 |
DOIs | |
State | Published - 2002 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy