Non-Fermi liquid behavior due to U(1) gauge field in two dimensions

作者：Wang Jing Rong; Liu Guo Zhu^*

来源：Nuclear Physics B, 2010, 832(3): 441-461.

DOI：10.1016/j.nuclphysb.2010.01.21

• (2+1)-dimensional quantum electrodynamics
• Massless Dirac fermion
• Non-Fermi liquid behavior

We study the damping rate of massless Dirac fermions due to the U(1) gauge field in (2 + 1)-dimensional quantum electrodynamics. In the absence of a Maxwell term for the gauge field, the fermion damping rate IM Sigma(omega, T) is found to diverge in both perturbative and self-consistent results. In the presence of a Maxwell term, there is still divergence in the perturbative results for Im Sigma(omega, T). Once the Maxwell term is included into the self-consistent equation for fermion self-energy and vacuum polarization functions, the fermion damping rage is free of divergence and exhibits non-Fermi liquid behavior: Im Sigma(omega, T) alpha max(root omega, root T).

• 出版日期2010-6-21
• 单位中国科学技术大学