Density dependence of valley polarization energy for composite fermions

Abstract

In two-dimensional electron systems confined to wide AlAs quantum wells, composite fermions around the filling factor $\nu$ = 3/2 are fully spin polarized but possess a valley degree of freedom. Here we measure the energy needed to completely valley polarize these composite fermions as a function of electron density. Comparing our results to the existing theory, we find overall good quantitative agreement, but there is an unexpected trend: The measured composite fermion valley polarization energy, normalized to the Coulomb energy, decreases with decreasing density.

References in corpus (10)

• Non-Abelian Anyons and Topological Quantum Computation
• Valley susceptibility of an interacting two-dimensional electron system
• Two-dimensional electrons occupying multiple valleys in AlAs
• Spin polarization and g-factor of a dilute GaAs two-dimensional electron system
• NMR Determination of 2D Electron Spin Polarization at $\nu =1/2$
• Valley polarization and susceptibility of composite fermions around nu=3/2
• Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of nu = 1/2
• Spin Transition in the Half-Filled Landau Level
• Spin-valley phase diagram of the two-dimensional metal-insulator transition
• Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region $1<\nu <2$

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• Exact results for model wave functions of anisotropic composite fermions in the fractional quantum Hall effect
• Composite fermion valley polarization energies: Evidence for particle-hole asymmetry
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