Integral representation of the density matrix of the XXZ chain at finite temperatures
classification
❄️ cond-mat.stat-mech
hep-th
keywords
chaindensityfiniteformulaintegralmatrixfieldinfinitely
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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 magnetic field.
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