Renormalization Transformations for Quantum Spin Systems
- 30 May 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 38 (22) , 1231-1234
- https://doi.org/10.1103/physrevlett.38.1231
Abstract
An operator renormalization transformation is proposed for quantum spin systems which is manifestly basis independent and preserves the fundamental symmetries of the spin Hamiltonian. We develop a cumulant expansion suitable for noncommuting operators and illustrate the general techniques with several sample calculations.Keywords
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