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HL: Halbleiterphysik

HL 16: Transport im hohen Magnetfeld / QHE

HL 16.3: Talk

Tuesday, March 12, 2002, 11:30–11:45, H15

Spin polarization transitions in the FQHE — •Eros Mariani¹, Franco Napoli², Nicodemo Magnoli², Matteo Merlo², Riccardo Mazzarello¹, Maura Sassetti², and Bernhard Kramer¹ — ¹I. Inst. Theor. Phys. Uni-Hamburg, Jungiusstrasse 9, D-20355 Hamburg (Germany) — ²Dipartimento di Fisica, Universitá di Genova, Via Dodecaneso 33, I-16146 Genova (Italy)

The spin polarization of the FQHE Ground State at fixed filling factor is analyzed as a function of the external magnetic field. The Chern-Simons Composite Fermion picture is used to derive the possible values of the polarization and interpret the phase transitions between differently polarized Ground States. The role of the gauge field fluctuations is considered in detail near the phase transition region, and is shown to produce the partly polarized states observed in recent experiments [1]. Additional exotic features of these states are discussed. [1] I. V. Kukushkin et al.: PRL 82, 3665 (1999); JETP Letters 70, 730 (1999); PRL 85, 3688 (2000)