Maximum Spontaneous Magnetization and Nambu-Goldstone Mode

Maximum Spontaneous Magnetization and Nambu-Goldstone Mode
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最大自发磁化和南部-戈德斯通模式

DOI:
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发表时间:
2017
期刊:
arXiv: Mathematical Physics
影响因子:
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通讯作者:
T. Koma
T. Koma
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文献类型:
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作者:
T. Koma

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我们研究了超立方晶格上的量子反铁磁海森堡模型。在不作任何假设的情况下,我们证明了以下三个定理:(I)在零或非零低温下,利用无限小的弱对称破缺磁场所得到的自发磁化强度等于最大自发磁化强度。(Ii)当自发磁化强度在零温下不为零时,在无限大体积纯基态上方出现无间隙激发,即Nambu-Goldstone模式。(3)当自发磁化强度在零或非零低温下不为零时,无限体积极限内的横向关联呈现Nambu-Goldstone类型的慢衰变。
We study quantum antiferromagnetic Heisenberg models on a hypercubic lattice. We prove the following three theorems without any assumption: (i) The spontaneous magnetization which is obtained by applying the infinitesimally weak symmetry breaking field is equal to the maximum spontaneous magnetization at zero or non-zero low temperatures. (ii) When the spontaneous magnetization is non-vanishing at zero temperature, there appears a gapless excitation, Nambu-Goldstone mode, above an infinite-volume pure ground state. (iii) When the spontaneous magnetization is non-vanishing at zero or non-zero low temperatures, the transverse correlation in the infinite-volume limit exhibits a Nambu-Goldstone-type slow decay.
晶格量子系统中的长程有序、态“塔”和对称破缺
DOI: 10.1007/s10955-018-2193-8
发表时间: 2019
影响因子: 1.6
作者:
Y Oka;S Suetaka;H Ago;Y Miyachi;Y Hayashi;M Arai;Hal Tasaki
通讯作者: Hal Tasaki