Finite-energy spectral function of an anisotropic two-dimensional system of coupled Hubbard chains

Article

关键词: FERMI-LIQUID BEHAVIOR;    LUTTINGER LIQUIDS;    MAGNETIC-FIELD;    FRACTIONAL CHARGE;    HIGHER DIMENSIONS;    QUANTUM FLUIDS;    WAVE-FUNCTION;    ONE-PARTICLE;    MODEL;    SPIN;   

DOI  :  10.1103/PhysRevB.84.045112

来源: SCIE

【 摘 要 】

We study the crossover from the one-dimensional to the two-dimensional Hubbard model in the photoemission spectra of weakly coupled chains. The chains with on-site repulsion are treated using the spin-charge factorized wave function, known to provide an accurate description of the dynamics of the model in the strong coupling limit, while the hoppings between the chains are considered as a perturbation. We calculate dynamical spectral functions at all energies in the random-phase approximation by resuming an infinite set of diagrams. Even though the hoppings drive the system from a fractionalized Luttinger-liquid-like system to a Fermi-liquid-like system at low energies, significant characteristics of the one-dimensional system remain in the two-dimensional system. Furthermore, we find that, of introducing (frustrated) hoppings beyond the nearest-neighbor one, the interference effects increase the energy and momentum range of the one-dimensional character.

【 授权许可】

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