Valley polarization and susceptibility of composite fermions around nu=3/2

Abstract

We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around Landau level filling factor nu = 3/2, demonstrating that the quasiparticles are composite Fermions (CFs) with a valley degree of freedom. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the CF valley susceptibility and polarization. The data can be explained well by a simple Landau level fan diagram for CFs, and are in nearly quantitative agreement with the results reported for CF spin polarization.

to appear in Phys. Rev. Lett

References in corpus (5)

• Valley susceptibility of an interacting two-dimensional electron system
• Low-temperature, in situ tunable, uniaxial stress measurements in semiconductors using a piezoelectric actuator
• Observation of Quantum Hall Valley Skyrmions
• The Two-flux Composite Fermion Series of Fractional Quantum Hall States in Strained Si
• Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom

Cited by in corpus (13)

• Valley Vortex States in Sonic Crystals
• Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
• Transference of Transport Anisotropy to Composite Fermions
• Phase Diagram of Fractional Quantum Hall Effect of Composite Fermions in Multi-Component Systems
• 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
• Density dependence of valley polarization energy for composite fermions
• Valley polarization assisted spin polarization in two dimensions
• 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
• Spin-singlet Gaffnian wave function for fractional quantum Hall systems
• Temperature dependence of piezoresistance of composite Fermions with a valley degree of freedom