SLAVE-PARTICLE STUDIES OF THE ELECTRON-MOMENTUM DISTRIBUTION IN THE LOW-DIMENSIONAL T-J MODEL

Article

关键词: VALENCE-BOND STATE;    ANGLE-RESOLVED PHOTOEMISSION;    ANTIFERROMAGNETIC HEISENBERG-MODEL;    MEAN-FIELD-THEORY;    U HUBBARD-MODEL;    LUTTINGER-LIQUID;    ANDERSON MODEL;    CORRELATION EXPONENTS;    QUANTUM FLUIDS;    SQUARE LATTICE;   

DOI  :  10.1103/PhysRevB.47.15192

来源: SCIE

【 摘 要 】

The electron-momentum distribution function in the t-J model is studied in the framework of the slave-particle approach. Within the decoupling scheme used in gauge-field and related theories, we treat formally phase and amplitude fluctuations as well as constraints without further approximations. Our result indicates that the electron Fermi surface observed in high-resolution angle-resolved photoemission and inverse-photoemission experiments cannot be explained within this framework, and the sum rule for the physical electron is not obeyed. A correct scaling behavior of the electron-momentum distribution function near k approximately k(F) and k approximately 3k(F) in one dimension can be reproduced by considering the nonlocal string fields [Z. Y. Weng et al., Phys. Rev. B 45, 7850 (1992)], but the overall momentum distribution is still not correct, at least at the mean-field level.

【 授权许可】

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