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cond-mat.str-el2006★ 3 cited
A Renormalisation-Group Algorithm for Eigenvalue Density Functions of Interacting Quantum Systems
Tobias J. Osborne
We present a certifiable algorithm to calculate the eigenvalue density function -- the number of eigenvalues within an infinitesimal interval -- for an arbitrary 1D interacting qua…
cond-mat.str-el2005★ 2 cited
Lower Bound for the Ground-State Energy Density of a 1D Quantum Spin System
Tobias J. Osborne
We present a simple method to calculate systematic lower bounds for the ground-state energy density of a 1D quantum spin system.