Quantum spin liquid from electron-phonon coupling

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

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.
来自电子-声子耦合的量子自旋液体
量子自旋液体(QSL)是一种奇特的绝缘相,它具有新兴的规场和分数化激发。然而,在 "非工程 "微观模型(或任何材料)中毫不含糊地证明量子自旋液体的存在仍然具有挑战性。在这里,我们利用数值精确无符号问题量子蒙特卡洛模拟,证明了 QSL 出现在非工程电子-声子模型中。具体来说,我们研究了二维三角形晶格上半填充(每个位点一个电子)的键Su-Schrieffer-Heeger(SSH)模型的基态相位图。这为在现实材料中寻找 QSL 以及通过轻度掺杂实现高$T_c$ 超导性提供了新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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