Observation of pinning mode of stripe phases of 2D systems in high Landau levels

G. Sambandamurthy, R. M. Lewis, Han Zhu, Y. P. Chen, L. W. Engel, D. C. Tsui, L. N. Pfeiffer, K. W. West

Published 2008-03-21Version 1

We study the radio-frequency diagonal conductivities of the anisotropic stripe phases of higher Landau levels near half integer fillings. In the hard direction, in which larger dc resistivity occurs, the spectrum exhibits a striking resonance, while in the orthogonal, easy direction, no resonance is discernable. The resonance is interpreted as a pinning mode of the stripe phase.