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arXiv 2411.04470cond-mat.str-elquant-ph
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具有调制 Gamma 相互作用的自旋-1/2 XX 链

Spin-1/2 XX chains with modulated Gamma interaction

M. Abbasi, S. Mahdavifar, M. Motamedifar

AI总结:

本文用费米子化精确求解含均匀与交错叠加 Gamma 相互作用的自旋-1/2 XX 链,通过能隙和多类序参量刻画基态相图及多种相变。

摘要:

我们研究了具有调制 Gamma 相互作用(GI)的自旋-1/2 XX 链,该相互作用源于均匀 Gamma 项与交错 Gamma 项的叠加。我们利用费米子化技术精确对角化了该模型的哈密顿量。随后,我们探究能隙,并识别出有能隙和无能隙区域。我们还考察了交错手征、交错向列和二聚体序参量,以确定基态相图中的不同相及其各自的长程序。研究结果表明,该模型会经历一级、二级、无能隙—无能隙以及有能隙—有能隙相变。

英文摘要:

We study the spin-1/2 XX chain with a modulated Gamma interaction (GI), which results from the superposition of uniform and staggered Gamma terms. We diagonalize the Hamiltonian of the model exactly using the Fermionization technique. We then probe the energy gap and identify the gapped and gapless regions. We also examine the staggered chiral, staggered nematic and dimer order parameters to determine the different phases of the ground state phase diagram with their respective long-range orders. Our findings indicate that the model undergoes first-order, second-order, gapless-gapless, and gapped-gapped phase transitions.

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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