“School of Physic”
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| Paper IPM / Physic / 6571 |
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| Abstract: | |||||
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Inspired by the superblock method of White, we introduce a simple modification
of the standard renormalization group (RG) technique for the study of quantum
lattice systems. Our method, which takes into account the effect of boundary
conditions (BC), may be regarded as a simple way to obtain first estimates
of many properties of quantum lattice systems. By applying this method to the
one-dimensional free and interacting fermion system, we obtain the ground state
energy with a much higher accuracy than
with the standard RG method. We also calculate the density-density correlation
function in the free-fermion case, which shows good agreement with the exact
result.
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