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cond-mat.stat-mech2004
Integral representation of the density matrix of the XXZ chain at finite temperatures
Frank Göhmann, Andreas Klümper, Alexander Seel
We present an integral formula for the density matrix of a finite segment of the infinitely long spin-1/2 XXZ chain. This formula is valid for any temperature and any longitudinal…
cond-mat.stat-mech2001
Equivalence of TBA and QTM
Minoru Takahashi, Masahiro Shiroishi, Andreas Klumper
The traditional thermodynamic Bethe ansatz (TBA) equations for the XXZ model at are derived within the quantum transfer matrix (QTM) method. This provides further eviden…