蜂窝晶格Hubbard模型中量子临界性的多带对偶费米子方法
强关联电子
2018-04-04 v3
摘要
我们利用对偶费米子方法的多带表述，研究蜂窝晶格上靠近量子临界点的Hubbard模型。除了动力学平均场的强局域关联外，通过阶梯图求和纳入了所有长度尺度的临界涨落。对磁化率的分析给出了从顺磁半金属到反铁磁绝缘体的量子相变临界相互作用强度的估计，与其他数值方法吻合良好。我们进一步估计了到重整化经典区域的跨接温度。我们的数据表明，在大相互作用强度下，蜂窝晶格上的Hubbard模型表现为量子非线性sigma模型，同时处于非费米液体态。
引用
@article{arxiv.1710.08199,
title = {Multiband Dual Fermion Approach to Quantum Criticality in the Hubbard Honeycomb Lattice},
author = {Daniel Hirschmeier and Hartmut Hafermann and Alexander I. Lichtenstein},
journal= {arXiv preprint arXiv:1710.08199},
year = {2018}
}
备注
- changed the last sentence in the abstract - rewrote Sec. II.A - added references 11,18 and 29 - changed styles in Fig.4, Fig.5 and Fig.6 to improve coherence - revised Fig.7 promoted insets to individual panels and added polynomial extrapolation of the self-energy data - Rewrote Sec. III.B. - Rewrote parts of the appendix - added Refs. 19-21