2 research outputs found
Shadow band in the one-dimensional large Hubbard model
We show that the factorized wave-function of Ogata and Shiba can be used to
calculate the dependent spectral functions of the one-dimensional, infinite
Hubbard model, and of some extensions to finite . The resulting spectral
function is remarkably rich: In addition to low energy features typical of
Luttinger liquids, there is a well defined band, which we identify as the
shadow band resulting from spin fluctuations. This band should be
detectable experimentally because its intensity is comparable to that of the
main band for a large range of momenta.Comment: Latex file. 4 pages. Figures upon reques
Spectral functions of the 1D Hubbard model in the U -> \infty limit: How to use the factorized wave-function
We give the details of the calculation of the spectral functions of the 1D
Hubbard model using the spin-charge factorized wave-function for several
versions of the U -> +\infty limit. The spectral functions are expressed as a
convolution of charge and spin dynamical correlation functions. A procedure to
evaluate these correlation functions very accurately for large systems is
developed, and analytical results are presented for the low energy region.
These results are fully consistent with the conformal field theory. We also
propose a direct method of extracting the exponents from the matrix elements in
more general cases.Comment: 15 pages,7 eps figures, RevTeX, needs epsf and multico