Self-consistent T-matrix approach to gap renormalization in quantum magnets with bond disorder
Oleg I. Utesov
Abstract:Based on the self-consistent T-matrix approximation (SCTMA), analytical theory of density of states (DOS) in three-dimensional quantum magnets with the bond disorder is proposed. It successfully describes DOS in both cases of resonant and non-resonant scattering which appearance is governed by the ratio of scattering length and the average distance between impurities. Corrections to the quasiparticles band gap in these cases are shown to be ∝ c 2/3 and ∝ c, respectively. Moreover, the theory yields a semi-circ… Show more
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