Friedel oscillations in a two-band Hubbard model for CuO chains

被引：5

作者：

Mori, M ^{[1
]}

Tohyama, T

Maekawa, S

Riera, JA

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Univ Nacl Rosario, Consejo Nacl Invest Cient & Tecn, Inst Fis Rosario, RA-2000 Rosario, Santa Fe, Argentina

[3] Univ Nacl Rosario, Dept Fis, RA-2000 Rosario, Santa Fe, Argentina

[4] Univ Toulouse 3, Phys Theor Lab, CNRS, FRE2603, F-31062 Toulouse, France

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.69.014513

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Friedel oscillations induced by open boundary conditions in a two-band Hubbard model for CuO chains are numerically studied. We find that for physically realistic parameters and close to quarter filling, these oscillations have a 2k(F) modulation according with experimental results on YBa2Cu3O7-delta. In addition, we predict that, for the same parameters, as hole doping is reduced from quarter filling to half filling, Friedel oscillations would acquire a 4k(F) modulation, typical of a strongly correlated electron regime. The 4k(F) modulation also dominates in the electron doped region. The range of parameters varied is very broad, and hence the results reported could apply to other cuprates and other strongly correlated compounds with quasi-one-dimensional structures. On a more theoretical side, we stress the fact that the copper and oxygen subsystems should be described by two different Luttinger liquid exponents.

引用

页数：7

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