4.6 Article

Partial Kondo screening and anomalous thermal conductance

期刊

PHYSICAL REVIEW B
卷 105, 期 8, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.085135

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资金

  1. National Research Foundation [NRF-2020R1F1A1073870, NRF-2020R1A4A3079707]

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This study investigates the phase diagram of the J(1)-J(2) Kondo-Heisenberg model on a honeycomb lattice at a quarter filling, discussing the emergence of partial Kondo screening in the frustrated regime and the appearance of a fractionalized superconductor (SC*) analogous to the FL*.
The frustrated magnetism on the Kondo lattice system motivates intriguing Kondo breakdown beyond the traditional Doniach scenario. Among them, the fractionalized Fermi liquid (FL*) has drawn particular interest by virtue of its fractionalized nature. Here we study the phase diagram of the J(1)-J(2) Kondo-Heisenberg model on a honeycomb lattice at a quarter filling. Employing the slave-fermion mean-field theory with d +/- id spin liquid ansatz and exact diagonalization, we discuss the emergence of partial Kondo screening in the frustrated regime with comparable J(1) and J(2), and the fractionalized superconductor (SC*), which is a superconductor analogy of the FL*. Due to the larger number of local spin moments than itinerant electrons, the magnetic fluctuation is still significant even in the strong-coupling limit, which influences the thermodynamic and transport properties qualitatively. In particular, we estimate the thermal conductance to probe the low-energy excitation and show the anomalous behavior in the SC* phase in contrast to the conventional superconductors.

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