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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Acoplamento BCS em um l?quido de Luttinger em uma dimens?o

Eneias, Ronivon Louren?o 07 July 2015 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-31T00:01:30Z No. of bitstreams: 1 RonivonLourencoEneias_TESE.pdf: 1676046 bytes, checksum: 87e6e8368469e2f6effb374dfefd6b2b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-02T22:51:28Z (GMT) No. of bitstreams: 1 RonivonLourencoEneias_TESE.pdf: 1676046 bytes, checksum: 87e6e8368469e2f6effb374dfefd6b2b (MD5) / Made available in DSpace on 2016-06-02T22:51:28Z (GMT). No. of bitstreams: 1 RonivonLourencoEneias_TESE.pdf: 1676046 bytes, checksum: 87e6e8368469e2f6effb374dfefd6b2b (MD5) Previous issue date: 2015-07-07 / Neste trabalho nos investigamos o efeito de um emparelhamento do tipo BCS para f?rmions livres sem spin, em 1 + 1 dimens?es. Usando t?cnicas de bosoniza??o testamos a exist?ncia de modos de quasipart?culas no estado supercondutor resultante. N?s calculamos a fun??o de Green de uma part?cula isolada, a fun??o de correla??o de pares e a condutividade ?ptica e mostramos como elas diferem das fun??es an?logas para quasipart?culas convencionais. N?s compararmos os nossos resultados com os resultados experimentais relacionados aos supercondutores de alta temperatura e mostramos que eles se encaixam qualitativamente bem com os modos de quasipart?culas observados nesses materiais. / In this work we investigate the e ect of a BCS-type pairing for free spinless fermions, in 1+1 dimension. Using bosonization techniques we test the existence of quasiparticle modes in the resulting BCS like superconducting state. We calculate the single particle Green's function, the pair correlation function, the spectral function and the optical conductivity and we show how they di er from their conventional quasiparticle analogues. We compare our results with the related experimental ndings for high temperature superconductors and we show that they t qualitatively well the observed quasiparticles modes in those materials.

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