Spin-Polarization of Composite Fermions and Particle-Hole Symmetry Breaking

Abstract

We study the critical spin-polarization energy (${\alpha }_{\mathrm{C}}$) above which fractional quantum Hall states in two-dimensional electron systems confined to symmetric GaAs quantum wells become fully spin-polarized. We find a significant decrease of ${\alpha }_{\mathrm{C}}$ as we increase the well-width. In systems with comparable electron layer thickness, ${\alpha }_{\mathrm{C}}$ for fractional states near Landau level filling $\nu =3/2$ is about twice larger than those near $\nu =1/2$, suggesting a broken particle-hole symmetry. Theoretical calculations, which incorporate Landau level mixing through an effective three-body interaction, and finite layer thickness, capture certain qualitative features of the experimental results.

References in corpus (6)

• Spinful Composite Fermions in a Negative Effective Field
• Spin Transition in the Half-Filled Landau Level
• Density dependence of valley polarization energy for composite fermions
• Composite fermion valley polarization energies: Evidence for particle-hole asymmetry
• Absorption in the fractional quantum Hall regime: trion dichroism and spin polarization
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• Interacting composite fermions: Nature of the 4/5, 5/7, 6/7, and 6/17 fractional quantum Hall states
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• Pseudospin Polarization of Composite Fermions under Uniaxial Strain