Xiang Yuan-Yuan, Liu Xiao-Jie, Yuan Ying-Han, Cao Jie, Tang Chun-Mei
Department of Physics, College of Science, Hohai University, Nanjing, People's Republic of China.
J Phys Condens Matter. 2019 Mar 27;31(12):125601. doi: 10.1088/1361-648X/aafd4d. Epub 2019 Jan 10.
Using functional renormalization group method, we studied the phase diagram of the one-dimensional extended Hubbard model at different dopings. At half filling, variety of states strongly compete with each other. These states include spin-density wave, charge-density wave, s-wave and p -wave superconductivity, phase separation, and an exotic bond-order wave. By doping, system favours superconductivity more than density waves. At 1/8 doping, a new area of extended s-wave superconductivity emerges between charge density wave and bond-order wave regions. If the system is doped to 1/4-doping, a new area of p -wave superconductivity emerges between charge-density wave and spin-density wave regions.
我们使用泛函重整化群方法研究了不同掺杂情况下一维扩展哈伯德模型的相图。在半填充时，各种状态之间存在强烈竞争。这些状态包括自旋密度波、电荷密度波、s波和p波超导、相分离以及一种奇异的键序波。通过掺杂，系统对超导的偏好超过了密度波。在1/8掺杂时，在电荷密度波和键序波区域之间出现了一个新的扩展s波超导区域。如果系统被掺杂到1/4掺杂，在电荷密度波和自旋密度波区域之间会出现一个新的p波超导区域。
