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arXiv math-ph/0504009math-phcond-mat.othermath.MP
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一类可积自旋系统

Classes of integrable spin systems

Robin Steinigeweg, Heinz-Jürgen Schmidt

摘要:

我们研究某些类可积的经典或量子自旋系统。第一类的特点是递归定义的属性$P$说,自旋系统由一个单一的自旋或可以分解成两个均匀耦合或不相交的子系统的属性$P$。对于这些系统的时间演化可以显式计算。第二类由自旋系统组成,其中所有非零耦合常数具有相同的强度(自旋图),具有$N-1$独立的海森堡型运动交换常数。这些系统被证明具有上述性质$P$,并可以表征为自旋图不包含长度为4的链。我们完全枚举和表征所有的自旋图N=5自旋。简要讨论了不可积自旋系统辛数值积分器的构造。

英文摘要:

We investigate certain classes of integrable classical or quantum spin systems. The first class is characterized by the recursively defined property $P$ saying that the spin system consists of a single spin or can be decomposed into two uniformly coupled or disjoint subsystems with property $P$. For these systems the time evolution can be explicitely calculated. The second class consists of spin systems where all non-zero coupling constants have the same strength (spin graphs) possessing $N-1$ independent, commuting constants of motion of Heisenberg type. These systems are shown to have the above property $P$ and can be characterized as spin graphs not containing chains of length four. We completely enumerate and characterize all spin graphs up to N=5 spins. Applications to the construction of symplectic numerical integrators for non-integrable spin systems are briefly discussed.

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