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The thermofield transfer-matrix method is formulated in detail and applied to one-dimensional quantum spin systems. The convergence properties of the thermofield transfer matrix are examined in detail by use of the numerically exact method. It is shown that this method is a unification of the quantum transfer-matrix method and projector method, and provides a very powerful means to study a variety of quantum systems.
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Suzuki et al. (1986) studied this question.
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