QUASI-PARTICLE SPECTRUM IN A NEARLY ANTIFERROMAGNETIC FERMI-LIQUID - SHADOW AND FLAT BANDS

被引:60
作者
CHUBUKOV, AV [1 ]
机构
[1] PL KAPITZA PHYS PROBLEMS INST, MOSCOW, RUSSIA
关键词
D O I
10.1103/PhysRevB.52.R3840
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We consider a two-dimensional Fermi liquid in the vicinity of a spin-density-wave transition to a phase with commensurate antiferromagnetic long-range order. We assume that near the transition, the Fermi surface is large and crosses the magnetic Brillouin zone boundary. We show that under these conditions, the self-energy corrections to the dynamical spin susceptibility, chi(q, omega), and to the quasiparticle spectral function, A (k, omega), are divergent near the transition. We identify and sum the series of most singular diagrams, and obtain a solution for chi(q, omega) and an approximate solution for A (k, omega). We show that (i) A(k) at a given, small omega has an extra peak at k=k(F)+pi (shadow band), and (ii) the dispersion near the crossing points is much flatter than for free electrons. The relevance of these results to recent photoemission experiments in YBa2Cu3O7-delta and Bi2Sr2 CaCu2O8 systems is discussed.
引用
收藏
页码:R3840 / R3843
页数:4
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