青岛大学学报（自然科学版）2018，Vol.31Issue(2)：42-47,6.DOI:10.3969/j.issn.1006-1037.2018.05.08
铜氧化物超导体中欠掺杂到过掺杂区域的费米速度和能隙速度的研究
The Fermi Velocity and Gap Velocity from Underdoping to Heavily Overdoping in Cuprate Superconductors
摘要
Abstract
By considering the pseudogap effect,the doping dependence of Fermi velocity and gap velocity in cuprate superconductors is studied from under doping to heavily overdoped region.Our results show that the Fermi velocity vF as a function of doping exhibits almost linear dependence,and it increases with the doping concentration increases from under doping to overdoping,while the gap velocity vF decreases with the doping concentration increase,and it reaches zero in heavily overdoped region.In particular,we have studied the doping dependence of the ratio of quasiparticle velocities normal and tangential to the Fermi surface at the nodes vF/v2.It is shown that vF/v2 increases with the doping concentration increasing.Moreover,we explain that vF/v2 has very rapidly increased upon the doping concentration increasing in heavily overdoped cuprate superconductors.关键词
铜氧化物超导体/t-J模型/赝能隙/费米速度Key words
Cuprate superconductors/t-J model/pseudogap/Fermi velocity分类
数理科学引用本文复制引用
刘述春,赵怀松,徐胜,袁峰..铜氧化物超导体中欠掺杂到过掺杂区域的费米速度和能隙速度的研究[J].青岛大学学报（自然科学版）,2018,31(2):42-47,6.基金项目
国家自然科学基金(批准号:ZR11547034,ZR11647168)资助. （批准号:ZR11547034,ZR11647168）
