Exact regimes of collapsed and extra two-string solutions in the two down-spin sector of the spin-1/2 massive XXZ spin chain

Exact regimes of collapsed and extra two-string solutions in the two down-spin sector of the spin-1/2 massive XXZ spin chain
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自旋 1/2 大规模 XXZ 自旋链的两个下自旋扇区中折叠和额外两串解的精确机制

DOI:
10.1088/1751-8121/aaf29f
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发表时间:
2019
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
Tetsuo Deguchi
Tetsuo Deguchi
中科院分区:
--
文献类型:
--
作者:
Takashi Imoto;Jun Sato;Tetsuo Deguchi

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我们精确地导出了周期自旋1/2XXZ自旋链的大量区域中具有两个下自旋的复解的数目。这里我们注意到贝特方程的每一个解都由一组量子数刻画。我们推导出他们的所有复杂的解决方案,我们称之为两个字符串的解决方案。我们表明,在一个区域的和两个字符串的解决方案的数量是由两个大于由于字符串假设的数量,即一个额外的双字符串出现。我们确定它的确切,也是这样的地区,两个字符串的解决方案崩溃的任何正整数。我们说明额外的和标准的两个字符串解决方案的数字。在部门,我们表明,字符串偏差是指数小,如果是大的。我们认为,对于任何有限的解决方案的自旋-1/2 XXX链有这样一个解决方案的自旋-1/2 XXZ链,具有相同的量子数在共同的XXX解决方案。
We derive exactly the number of complex solutions with two down-spins in the massive regime of the periodic spin-1/2 XXZ spin chain of sites. Here we remark that every solution of the Bethe ansatz equations is characterized by a set of quantum numbers. We derive them analytically for all the complex solutions in the sector, which we call two-string solutions. We show that in a region of and the number of two-string solutions is by two larger than the number due to the string hypothesis, ie an extra pair of two-strings appears. We determine it exactly and also such regions where two-string solutions collapse for any positive integers. We illustrate the extra and standard two-string solutions numerically. In the sector we show that the string deviations are exponentially small with respect to if is large. We argue that for any finite solution of the spin-1/2 XXX chain there is such a solution of the spin-1/2 XXZ chain that has the same quantum numbers in common with the XXX solution.
可积量子多体系统中的有限温度传输
DOI: --
发表时间: 1999
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影响因子: --
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