Composite Fermions and the Fractional Quantum Hall Effect

The mean field (MF) composite Fermion (CF) picture successfully predicts low lying states of fractional quantum Hall systems. This success cannot be attributed to a cancellation between Coulomb and Chern-Simons interactions beyond the mean field and solely depends on the short range (SR) of the Coulomb pseudopotential in the lowest Landau level (LL). The class of pseudopotentials for which the MFCF picture can be applied is defined. The success or failure of the MFCF picture in various systems (electrons in excited LL's, Laughlin quasiparticles, charged magneto-excitons) is explained.Comment: 10 pages + 4 figures (RevTeX+epsf.sty); submitted to Acta Phys. Pol.

WORKSHOP ON LOCAL GOVERNMENT

Public Economics,

Composite Fermion Approach to the Quantum Hall Hierarchy: When it Works and Why

The mean field composite Fermion (MFCF) picture has been qualitatively successful when applied to electrons (or holes) in the lowest Landau level. Because the energy scales associated with Coulomb interactions and with Chern-Simons gauge field interactions are different, there is no rigorous justification of the qualitative success of the MFCF picture. Here we show that what the MFCF picture does is to select from all the allowed angular momentum (L) multiplets of N electrons on a sphere, a subset with smaller values of L. For this subset, the coefficients of fractional parentage for pair states with small relative angular momentum $R$ (and therefore large repulsion) either vanish or they are small. This set of states forms the lowest energy sector of the spectrum.Comment: RevTeX + 3 EPS figures formatted into the text with epsf.sty to appear in Solid State Communication

Excitations of the ν=5/2\nu=5/2 Fractional Quantum Hall State and the Generalized Composite Fermion Picture

We present a generalization of the composite Fermion picture for a muticomponent quantum Hall plasma which contains particle with different effective charges. The model predicts very well the low-lying states of a $\nu=5/2$ quantum Hall state found in numerical diagonalization.Comment: 5 pages, 3 figure