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Phys. Rev. Lett. 100, 256801 (2008) [4 pages]

Observation of Pinning Mode of Stripe Phases of 2D Systems in High Landau Levels

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G. Sambandamurthy*, R. M. Lewis, Han Zhu, and Y. P. Chen
National High Magnetic Field Laboratory, Tallahassee, Florida 32306, USA
Princeton University, Princeton, New Jersey 08544, USA

L. W. Engel
National High Magnetic Field Laboratory, Tallahassee, Florida 32306, USA

D. C. Tsui
Princeton University, Princeton, New Jersey 08544, USA

L. N. Pfeiffer and K. W. West
Bell Laboratories, Lucent Technologies, New Jersey 07974, USA

Received 21 March 2008; published 23 June 2008

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 discernible. The resonance is interpreted as a pinning mode of the stripe phase.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.256801
DOI:
10.1103/PhysRevLett.100.256801
PACS:
73.43.−f, 73.20.Qt, 73.21.−b

*Present address: University at Buffalo, Buffalo, NY, USA.

Present address: University of Maryland, College Park, MD, USA.

Present address: Purdue University, West Lafayette, IN, USA.