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arXiv 1909.09663cond-mat.str-elcond-mat.othermath-phmath.MP
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作为Néel态叠加的Lieb-Mattis哈密顿量的精确基态

Exact Ground State of Lieb-Mattis Hamiltonian as a Superposition of Néel states

Louk Rademaker

摘要:

我们证明了Lieb-Mattis哈密顿量的精确基态是所有可能的经典Néel态的等重叠加,并利用Schwinger玻色子给出了$S=1/2$和一般$S$在$z$ -自旋基上这种叠加的精确公式.一般来说,在一般初始状态上的可能旋转的叠加是对称的,当且仅当初始状态与单重态有非零重叠,否则由由于对称化而消失的状态组成。最值得注意的是,如果对称化,$|s, m=0 \rangle$态将消失,这解释了Néel态的叠加如何投射到其单态分量上。

英文摘要:

We show that the exact ground state of the Lieb-Mattis Hamiltonian is an equal-weight superposition of all possible classical Néel states, and provide an exact formulation of this superposition in the $z$-spin basis for both $S=1/2$ and general $S$ using Schwinger bosons. In general, a superposition of possible rotations on a general initial state is symmetric if and only if the initial state has a nonzero overlap with a singlet state and is otherwise made up of states that vanish due to the symmetrization. Most notably, $|s, m=0 \rangle$ states will vanish if symmetrized, which explains how a superposition of Néel states projects onto its singlet component.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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