可能存在蜂窝晶格上 Hubbard 模型的反常自旋动力学。

Possible anomalous spin dynamics of the Hubbard model on a honeycomb lattice.

机构信息

Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China.

出版信息

J Phys Condens Matter. 2011 Feb 2;23(4):045603. doi: 10.1088/0953-8984/23/4/045603. Epub 2011 Jan 12.

Abstract

In this paper, the Hubbard model on a honeycomb lattice is investigated by using an O(3) nonlinear σ model. A possible candidate for a quantum non-magnetic insulator in a narrow parameter region is found near the metal-insulator transition. After studying the magnetic properties of the quantum non-magnetic insulator, anomalous spin dynamics is shown. In addition, we find that this region could be widened by hole doping.

摘要

本文采用 O(3) 非线性 σ 模型研究了蜂窝格点上的 Hubbard 模型。在金属-绝缘相变附近，我们发现了一个在较窄参数区域内可能作为量子非磁性绝缘体的候选者。在研究了量子非磁性绝缘体的磁性后，我们展示了异常的自旋动力学。此外，我们发现通过空穴掺杂可以拓宽这个区域。