摘要
利用三维量子电动力学理论中的Dyson-Schwinger方程方法,研究了零温情况下平面铜氧化合物超导体的反铁磁相和d波超导相之间的相变．通过在朗道规范下近似解析求解和数值求解完全耦合的Dyson-Schwinger方程、并将所得结果与1/N展开方法的结果相比较,发现在半填充准费密子味道数约小于等于4的情况下,通过手征对称性自发破缺,d波超导相可以演化到反铁磁相,并且反铁磁相有可能与d波超导相共存．通过进一步比较不同相的压强,还说明反铁磁与d波超导共存相为稳定相,从而反铁磁相确实可以与d波超导相共存．
With the coupled Dyson-Schwinger equations in the framework of the unified QED3 theory, we study the phase transition between the antiferromagnet（AF） and the d-wave superconductor （dSC） of planar cuprates at T=0. By solving the coupled Dyson-Schwinger equations both analytically and numerically in rainbow approximation in Landau gauge and comparing the obtained results with that given in the 1/N expansion, we find that there exists a chiral symmetry breaking from dSC phase to AF phase when the quasifermion flavors N ≤ 4 in half-filling and the AF phase can possibly coexist with the dSC phase in the underdoped region. By comparing the pressure between the coexistent AF-dSC phase and dSC phase, we find that AF-dSC coexisting phase is the stable phase, the AF phase can then coexist with the dSC phase.
出处
《高能物理与核物理》
CSCD
北大核心
2007年第2期209-218,共10页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金(10425521,10135030,10575004)
国家重点基础研究发展规划项目(G2000077400)
教育部重点科研项目(305001)
高等学校博士学科点专项科研基金(20040001010)
教育部全国高等学校优秀青年教师奖励计划资助~~
