O papel da interação elétron-elétron no regime Hall quântico interio.

AUTOR(ES)

Sanderson Francisco Fernandes Pereira da Silva

DATA DE PUBLICAÇÃO

2004

RESUMO

Experimental and theoretical studies of the aspects of particle-like and collective behavior of electrons in the proximity of the edges of two-dimensional (2DES) and quasi-one-dimensional (Q1DES) systems, named quantum wires (QWs), in semiconductor heterostructures reveal the important role of the electron-electron interaction on the edge states in the integer quantum Hall regime (IQHR). In this thesis we treat two essentially different problems concerning the effects of the electron-electron interaction in low-dimensional electron system in the IQHR. The first problem is related to the suppression of the spin-splitting of the lowest Landau level (LL) (n = 0) due to many-body effects (the electron-electron interaction including exchange and correlation effects of the edge states) in QWs in the IQHR, where the electron behavior is particle-like. Two scenarios are discussed for the collapse of the IQHR at ν = 1 for an electron channel of effective width W modelling the QW. In the first scenario we assume that there is no electron redistribution in the region limited by W at a critical magnetic field B(1) cr , for which the Fermi level (FL) coincides with the bottom of the highest empty LL, at the threshold of the spin-splitting. For B

ASSUNTO(S)

interação elétron-elétron magnetoplasmons fisica da materia condensada física da matéria condensada regime hall quântico inteiro

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