Посилання:Spontaneous Magnetization of Quantum XY-chain from Finite Chain Form-factors / N.Z. Iorgov // Укр. фіз. журн. — 2010. — Т. 55, № 1. — С. 116-120. — Бібліогр.: 18 назв. — англ.
Підтримка:This article is based on the talk given at the Bogolyubov Kyiv conference “Modern Problems of Theoretical and Mathematical Physics”, September 15-18, 2009, Kyiv, Ukraine. The work was supported by the Program of Fundamental Research of the Physics and Astronomy Division of the NAS of Ukraine, the Ukrainian FRSF grants 28.2/083 and 29.1/028, by French-Ukrainian program “Dnipro” M17-2009 and the joint project PICS of CNRS and NAS of Ukraine.
Using the explicit factorized formulas for matrix elements (formfactors) of the spin operators between the eigenvectors of the Hamiltonian of a finite quantum XY-chain in a transverse field, the spontaneous magnetization for σ^x and σ^y is re-derived in a simple way.
Використовуючи факторизованi формули для матричних елементiв (формфакторiв) спiнових операторiв мiж власними векторами гамiльтонiана скiнченного квантового XY-ланцюжка в поперечному полi, дано простий вивiд формули для спонтанної намагнiченостi σ^x та σ^y.