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Spin texture and magnetoroton excitations at nu=1/3

Groshaus, JG; Dujovne, I; Gallais, Y; Hirjibehedin, CF; Pinczuk, A; Tan, YW; Stormer, H; ... West, KW; + view all (2008) Spin texture and magnetoroton excitations at nu=1/3. PHYS REV LETT , 100 (4) , Article 046804. 10.1103/PhysRevLett.100.046804. Green open access

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Abstract

Neutral spin texture (ST) excitations at nu=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 eta(c)=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 nu=1/3.

Type: Article
Title: Spin texture and magnetoroton excitations at nu=1/3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.046804
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.046804
Language: English
Additional information: © 2008 The American Physical Society
Keywords: QUANTUM HALL STATES, COMPOSITE FERMIONS, LIGHT-SCATTERING, MAGNETIC-FIELD, FINITE-SIZE, SKYRMIONS, ENERGIES, POLARIZATION, ENHANCEMENT, DEPENDENCE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/103149
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