Effects of the Berry phase and instantons in one-dimensional Kondo-Heisenberg model

Pallab Goswami*, Qimiao Si

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Motivated by the global phase diagram of antiferromagnetic heavy-fermion metals, we study the Kondo effect from the perspective of a nonlinear sigma model in the one-dimensional Kondo-Heisenberg model away from half-filling. We focus on the effects of the instanton configurations of the sigma-model field and the associated Berry phase. Guided by the results derived using bosonization methods, we demonstrate that the Kondo-singlet formation is accompanied by an emergent Berry phase. This Berry phase also captures the competition between the Kondo-singlet formation and spin-Peierls correlations. Related effects are likely to be realized in Kondo lattice systems in higher dimensions.

Original languageEnglish (US)
Article number126404
JournalPhysical review letters
Volume107
Issue number12
DOIs
StatePublished - Sep 16 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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