Spectral excitations in the one-dimensional spin-½ dimerized Heisenberg chain: A renormalization-group approach
- 1 March 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 19 (5), 2637-2644
- https://doi.org/10.1103/physrevb.19.2637
Abstract
A zero-temperature lattice renormalization-group calculation is presented and applied to the antiferromagnetic one-dimensional dimerized spin-½ Heisenberg chain. The calculation indicates the existence of a gap in the spectrum of the dimer system, which vanishes only in the limit of a uniform spin chain. To improve the accuracy of the numerical estimates of the ground-state energy and gap, an iterative extension of finite-chain techniques is also applied. These approximate techniques are checked against the dimerized chain, for which an exact solution is found.
Keywords
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