Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Correlated Electrons: Low-dimensional Systems - Models 1

TT 38.11: Talk

Thursday, March 26, 2009, 12:30–12:45, HSZ 301

Quantum Hall ferromagnetic states and spin-orbit interactions in the fractional regime — •Stefano Chesi and Daniel Loss — Department of Physics, University of Basel, CH-4056 Basel, Switzerland

The competition between the Zeeman energy and the Rashba and Dresselhaus spin-orbit couplings is studied for fractional quantum Hall states. A transition of the spin-polarization direction is predicted to occur at a small value of the Zeeman energy. For a given fractional state, the phenomenon can be accurately described in the perturbative limit of high magnetic fields. We consider the Laughlin wavefunctions and the Pfaffian state as specific examples and show that this phenomenon allows one to obtain valuable information about the nature of the correlated ground-state, and in particular about its pair-correlation function. We discuss indications of non-analytic features around the fractional states and include significant effects of the nuclear bath polarization in the relevant regime of temperatures and magnetic fields.