2007/06/08 by N. C. Bishop, M. Padmanabhan, Medini Padmanabhan +4 · 4 citations
Materials Science · Physics and Astronomy · #Composite fermion #Condensed matter physics #Electron #Fermion #Filling factor #Graphene research and applications #Landau quantization #Physics #Physics of Superconductivity and Magnetism #Polarization (electrochemistry) #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Quantum spin Hall effect #Quasiparticle #Superconductivity #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.98.266404
to appear in Phys. Rev. Lett
arxiv created 2007/06/08 · openalex publication_date 2007/06/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around a 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.