Dipoles at $ν=1$

Details Dipoles at $ν=1$ Dipoles at $ν=1$

1999-07-30

arxiv.org/abs/cond-mat/9907484v1

Physics

Condensed Matter

flatex_new vincent.tex, 4 files Proceedings on Composite Fermions and Confinement Moriond, France 1999-03-01 1999-03-06 March

Scientific paper

We consider the problem of Bosonic particles interacting repulsively in a strong magnetic field at the filling factor $\nu =1.$ We project the system in the Lowest Landau Level and map the dynamics into an interacting Fermion system. We study the resulting Hamiltonian in the Hartree--Fock approximation in the case of a $\delta $ repulsive potential. The physical picture which emerges is in agreement with the proposal of N. Read that the composite Fermions behave as a gas of dipoles. We argue that the consequence of this is that the composite Fermions interact with screened short range interactions. We develop a Landau theory which we also expect to describe the physical $\nu =1/2$ Fermionic state. The Form factor, the effective mass and the conductivity are analised in this model.

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