Huang Huai-Xiang, Chen Jing, Ren Wei, Gao Yi, Li Wei, Chen Yan
Department of Physics and Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China.
J Phys Condens Matter. 2019 Aug 28;31(34):345402. doi: 10.1088/1361-648X/ab2228. Epub 2019 May 16.
Insulator-metal transition is investigated self-consistently on the frustrated Shastry-Sutherland lattice in the framework of Slave-Boson mean-field theory. Due to the presence of quasi-flat band structure characteristic, the system displays a spin-density-wave (SDW) insulating phase at the weak doping levels, which is robust against frustration, and it will be transited into an SDW metallic phase at high doping levels. As further increasing the doping, the temperature or the frustration on the diagonal linking bonds, the magnetic order m will be monotonically suppressed, resulting in the appearance of a paramagnetic metallic phase. Although the Fermi surface of the SDW metallic phase may be immersed by temperature, the number of mobile charges is robust against temperature at weak doping levels.
在奴隶玻色子平均场理论框架下，对受挫的沙斯特里 - 萨瑟兰晶格上的绝缘体 - 金属转变进行了自洽研究。由于存在准平带结构特征，该系统在弱掺杂水平下呈现出自旋密度波（SDW）绝缘相，此相对于挫折具有鲁棒性，并且在高掺杂水平下会转变为SDW金属相。随着进一步增加掺杂、温度或对角连接键上的挫折，磁序m将被单调抑制，从而导致顺磁金属相的出现。尽管SDW金属相的费米面可能会被温度浸没，但在弱掺杂水平下，可移动电荷的数量对温度具有鲁棒性。
