Self-Consistent Second Order Perturbation Theory for the Hubbard Model in Two Dimensions
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概要
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XVe apply self-consistent secorad order perttrrloation theor'y (SCSOPT) xx'itla r'espect to the 011-site reptrlsive ir?teraction U to stttdy the Hub1o?trd raaodel in txvo dit?nensions. We investig?ttesingle particle jcroperties of' the model over tlae entire doping range at zero tetrnperatttre. It isslaoxvn that as doping decreases toward laalf'-filling !-lIl21SS errh;tncetnetut ['?tctor increases, xvhileA-unass er'uhanceraaerat f'actor decreases. The iracrease in w-rrmass enhancertaetat f'actor is I;trgertlaan the decrease ira A-naass er?hancenaent fttctor, so that total-taaass is tar"er th?tua tlaat in tlaenon-interactizug case. XVluen particle nurnber density per trnit cell n is gixvena by 0.64< n<1.0 interaction enhances anisotropy of the Fertaai strrface, xvlaeresxs ?tt lower densities n< 0.64interaction strppresses anisotropy of it. Due to Clue decrease in A'-tnass enhatacernertt factor thedensity of states (DOS) at tlae Fermi level is sttjcpressed. It is possilcle to trrtderstattd tlae restrltswritl'xin the frataaexvor'lc of tlae we?tl< cottpling Fermi liqtrid tlaeory.
- 社団法人日本物理学会の論文
- 1999-03-15