Quantum phase transition in a two-dimensional Kondo-Heisenberg model: A dynamical Schwinger-boson large-N approach

Jiangfan Wang*, Yung-Yeh Chang, Chung-Yu Mou, Stefan Kirchner, Chung-Hou Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We generalize the dynamical large-N multichannel Schwinger-boson approach to study the quantum phase transition of a two-dimensional Kondo-Heisenberg model, relevant for heavy electron systems, close to an antiferromagnetic Kondo destruction quantum critical point. By breaking up a Kondo singlet into a charge fermion (holon) and a bosonic spinon, we identify and characterize the quantum phase transition from an antiferromagnetically ordered state to a Kondo-dominated paramagnetic state, and attribute a jump in the holon phase shift to Kondo breakdown. We calculate transport and thermodynamic quantities. The global finite-temperature phase diagram and the critical behavior of various physical observables therein show a close resemblance to experimental observations.

Original languageEnglish
Article number115133
Number of pages17
JournalPhysical Review B
Volume102
Issue number11
DOIs
StatePublished - 15 Sep 2020

Keywords

  • FLUCTUATIONS
  • TEMPERATURE
  • LATTICE

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