arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2408.04002cond-mat.str-elcond-mat.supr-con
收藏

来自电子–声子耦合的量子自旋液体

Quantum spin liquid from electron-phonon coupling

Xun Cai, Zhaoyu Han, Zi-Xiang Li, Steven A. Kivelson, Hong Yao

AI总结:

该研究用无符号问题的量子蒙特卡洛模拟证明,二维三角晶格半填充键SSH电子–声子模型中存在完全有能隙、无对称破缺且支持退禁闭holon的QSL相。

摘要:

量子自旋液体(QSL)是一种奇异的绝缘相,具有演生规范场和分数化激发。然而,在一个“非人工设计”的微观模型中(或在任何材料中)明确证明QSL的存在仍然具有挑战性。本文利用数值精确且无符号问题的量子蒙特卡洛模拟,证明QSL出现在一个非人工设计的电子–声子模型中。具体而言,我们研究了半填充(每个格点一个电子)的二维三角晶格上键Su-Schrieffer-Heeger(SSH)模型的基态相图,并证明其中包含一个QSL相;该相完全有能隙、不表现出对称性破缺序,并支持退禁闭的分数化holon激发。这为在实际材料中寻找QSL,以及通过对其轻度掺杂获得高Tc超导性提供了新途径。

英文摘要:

A quantum spin liquid (QSL) is an exotic insulating phase with emergent gauge fields and fractionalized excitations. However, the unambiguous demonstration of the existence of a QSL in a "non-engineered" microscopic model (or in any material) remains challenging. Here, using numerically-exact sign-problem-free quantum Monte Carlo simulations, we show that a QSL arises in a non-engineered electron-phonon model. Specifically, we investigate the ground-state phase diagram of the bond Su-Schrieffer-Heeger (SSH) model on a 2D triangular lattice at half filling (one electron per site) which we show includes a QSL phase which is fully gapped, exhibits no symmetry-breaking order, and supports deconfined fractionalized holon excitations. This suggests new routes for finding QSLs in realistic materials and high-$T_c$ superconductivity by lightly doping them.

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。

↑