Hole-Doping Effects on a Two-dimensional Kondo Insulator

Details Hole-Doping Effects on a Two-dimensional Kondo Insulator Hole-Doping Effects on a Two-dimensional Kondo Insulator

2003-01-21

arxiv.org/abs/cond-mat/0301401v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 14 figures

Scientific paper

10.1143/JPSJ.72.1208

We study the effects of hole doping on the two-dimensional Heisenberg-Kondo model around the quantum critical point, where the spin liquid phase (Kondo insulator) and the magnetically ordered phase are separated via a second-order phase transition. By means of the self-consistent Born approximation within the bond operator formalism as well as the standard spin wave theory, we discuss dynamical properties of a doped hole. It is clarified that a quasi-particle state stabilized in the spin liquid phase is gradually obscured as the system approaches the quantum critical point. This is also the case for the magnetically ordered phase. We argue the similarity and the difference between these two cases.

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