Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-12-28
J Stat Phys (2010) 139: 743-768
Physics
Condensed Matter
Statistical Mechanics
24 pages, 1 figure
Scientific paper
We derive spin operator matrix elements between general eigenstates of the superintegrable Z_N-symmetric chiral Potts quantum chain of finite length. Our starting point is the extended Onsager algebra recently proposed by R.Baxter. For each pair of spaces (Onsager sectors) of the irreducible representations of the Onsager algebra, we calculate the spin matrix elements between the eigenstates of the Hamiltonian of the quantum chain in factorized form, up to an overall scalar factor. This factor is known for the ground state Onsager sectors. For the matrix elements between the ground states of these sectors we perform the thermodynamic limit and obtain the formula for the order parameters. For the Ising quantum chain in a transverse field (N=2 case) the factorized form for the matrix elements coincides with the corresponding expressions obtained recently by the Separation of Variables Method.
Gehlen von G.
Iorgov Nikolai
Pakuliak Stanislav
Shadura Vitaly
Tykhyy Yu.
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