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 (4)

• Non-Abelian Anyons and Topological Quantum Computation
• Valley susceptibility of an interacting two-dimensional electron system
• Valley polarization and susceptibility of composite fermions around nu=3/2
• Spin Transition in the Half-Filled Landau Level

Cited by in corpus (8)

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• Abelian and Non-Abelian States in $\nu =2/3$ Bilayer Fractional Quantum Hall Systems
• Competing Abelian and non-Abelian topological orders in $\nu =1/3+1/3$ quantum Hall bilayers
• Spin-Polarization of Composite Fermions and Particle-Hole Symmetry Breaking
• Composite fermion valley polarization energies: Evidence for particle-hole asymmetry
• A note contrasting two microscopic theories of the fractional quantum Hall effect
• Possible realization of a chiral p-wave paired state in a two component system
• Temperature dependence of piezoresistance of composite Fermions with a valley degree of freedom