QED $_3$对非掺杂高温超导体激发谱展宽的强耦合分析
Strong coupling analysis of QED$_3$ for excitation spectrum broadening in undoped high-temperature superconductor
摘要：
为了研究高温超导体中的掺杂空穴，将三维时空量子电动力学理论应用于二维$S=1/2$量子海森堡反铁磁体.对U（1）规范场相互作用进行了强耦合分析，描述了在未掺杂化合物中观察到的谱展宽。发现费米准粒子谱是高斯型的，谱宽约为3J，J为超交换作用能。谱的能移是准粒子带宽的数量级，这表明该系统是在强耦合制度相对于规范场相互作用描述的相位起伏的交错通量状态。
英文摘要：
Theory of quantum electrodynamics in three spatial-time dimension is applied to the two-dimensional $S=1/2$ quantum Heisenberg antiferromagnet in order to investigate a doped hole in high-temperature superconductors. Strong coupling analysis of the U(1) gauge field interaction is carried out to describe spectral broadening observed in the undoped compounds. It is found that the fermionic quasiparticle spectrum is of Gaussian form with the width about 3J, with J being the superexchange interaction energy. The energy shift of the spectrum is on the order of the quasiparticle band width, which suggests that the system is in the strong coupling regime with respect to the gauge field interaction describing the phase fluctuations about the staggered flux state.
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