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Phys. Rev. Lett. 100, 046804 (2008) [4 pages]

Spin Texture and Magnetoroton Excitations at ν=1/3

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Javier G. Groshaus1,2,*, Irene Dujovne1,2,†, Yann Gallais1,‡, Cyrus F. Hirjibehedin1,2,§, Aron Pinczuk1,2, Yan-Wen Tan1,**, Horst Stormer1, Brian S. Dennis2, Loren N. Pfeiffer2, and Ken W. West2
1Physics & Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
2Alcatel-Lucent Bell Labs, Murray Hill, New Jersey 07974, USA

Received 19 September 2007; published 30 January 2008

Neutral spin texture (ST) excitations at ν=1/3 are directly observed for the first time by resonant inelastic light scattering. They are determined to involve two simultaneous spin flips. At low magnetic fields, the ST energy is below that of the magnetoroton minimum. With increasing in-plane magnetic field these mode energies cross at a critical ratio of the Zeeman and Coulomb energies of ηc=0.020±0.001. Surprisingly, the intensity of the ST mode grows with temperature in the range in which the magnetoroton modes collapse. The temperature dependence is interpreted in terms of a competition between coexisting phases supporting different excitations. We consider the role of the ST excitations in activated transport at ν=1/3.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.046804
DOI:
10.1103/PhysRevLett.100.046804
PACS:
73.43.Lp, 73.20.Mf, 73.43.Nq

*Present address: Institute for Optical Sciences, Department of Chemistry and Department of Physics, University of Toronto, Toronto, ON, M5S 3H6, Canada.

jgg@phys.columbia.edu

†Present address: TU Delft, Kavli Institute of Nanoscience, The Netherlands.

‡Present address: Laboratoire Matériaux et Phénomènes Quantiques, CNRS UMR 7162, Université Paris 7, France.

§Present address: London Centre for Nanotechnology, Departments of Physics and Astronomy and Chemistry, University College London, London, U.K.

**Present address: Department of Physics, University of California Berkeley, CA 94720, USA.

 
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