Direct test of the composite-fermion model in quantum Hall systems

Article

关键词: FILLED LANDAU-LEVEL;    COLLECTIVE EXCITATIONS;    RESPONSE FUNCTIONS;    ELECTRON-GAS;    STATES;    HIERARCHY;    FLUID;    MASS;   

DOI  :  10.1103/PhysRevB.54.8699

来源: SCIE

【 摘 要 】

We show that neutron-scattering experiments can unambiguously determine a composite-fermion parameter, viz., the effective number of Landau levels p filled by the composite fermions. We also show that Raman scattering experiments can directly measure the effective cyclotron frequency <(omega)over bar>(c) of composite fermions and p will also be determined thereby if the effective mass of the composite fermion is given. For this purpose, one needs partially polarized or more preferably unpolarized quantum Hall states. We further find that the value of the static spin correlation function undergoes a jump in the spin transitions. We identify the effective number of Landau levels filled by composite fermions of up (or down) spin to be the order parameter in the spin transitions.

【 授权许可】

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