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Open access
Date
2015-04Type
- Journal Article
Abstract
We launch surface acoustic waves (SAW) along both the $\langle 110\rangle $ and the $\langle 1\bar{1}0\rangle $ directions of a Hall bar and measure the anisotropic conductivity in a high purity GaAs two-dimensional electron system in the quantum Hall regime of the stripe and the bubble phases. In the anisotropic stripe phase, SAW propagating along the 'easy' $\langle 110\rangle $ direction sense a compressible behavior (finite resistance) which is seen in standard transport measurement only if current flows along the 'hard' $\langle 1\bar{1}0\rangle $ direction. In the isotropic bubble phase, the SAW data show compressible behavior in both directions, in marked contrast to the incompressible quantum Hall behavior seen in transport measurements. These results challenge models that assume that both the stripe and the bubble phase consist of incompressible domains and raise important questions about the role of domain boundaries in SAW propagation. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000100956Publication status
publishedExternal links
Journal / series
New Journal of PhysicsVolume
Pages / Article No.
Publisher
IOP PublishingSubject
Quantum Hall effect; Surface acoustic waves; Collective excitations; Piezoelectric and acoustoelectric effectsMore
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