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cond-mat.stat-mech1997
The exact realisation of the Lanczos Method for a quantum Many-Body System
N. S. Witte
The Lanczos process has been analytically and exactly carried out for the spin 1/2 isotropic XY chain in the thermodynamic limit, yielding a form for the Lanczos coefficient $β^2(s…
cond-mat.stat-mech1997
The Analytic Lanczos Method
N. S. Witte
The classical formalism of the Moment Problem has been combined with a cumulant approach and applied to the extensive many-body problem. This has yielded many new exact results for…