Abstract
We investigate the quantum Hall stripe phase at filling factor at the microscopic level by probing the dispersion of its collective modes with the help of surface acoustic waves with wavelengths down to 60 nm. The dispersion is strongly anisotropic. It is highly dispersive and exhibits a roton minimum for wave vectors aligned along the easy transport direction. In the perpendicular direction, however, the dispersion is featureless, although not flat as predicted by theory. Oscillatory behavior in the absorption intensity of the collective mode with a wave vector perpendicular to the stripes is attributed to a commensurability effect. It allows us to extract the periodicity of the quantum Hall stripes.
- Received 17 January 2011
DOI:https://doi.org/10.1103/PhysRevLett.106.206804
© 2011 American Physical Society
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Microwaving and stirring the quantum Hall spaghetti
Published 16 May 2011
An ingenious experiment has probed the collective response of the quantum Hall stripe phase.
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