Triplon dynamics from partial Kondo screening in frustrated heavy-fermion systems
Abstract
The partially disordered (PD) phase, in which magnetically ordered and Kondo-screened sites coexist, has been proposed as a possible ground state of geometrically frustrated heavy-fermion systems. We investigate its dynamical properties in the half-filled periodic Anderson model on a triangular lattice by calculating the dynamical spin susceptibility within the random-phase approximation built on a self-consistent Hartree-Fock solution. We show that successive quantum phase transitions from the Kondo-insulating phase to the PD phase and to a magnetically ordered phase are driven by the condensation of triplon modes originating predominantly from the Kondo-screened sites. In the PD phase, magnons and triplons coexist and hybridize, leading to characteristic level repulsion in the excitation spectrum. These results reveal how triplet excitations evolve into collective magnetic modes across the successive phase transitions and highlight the dynamical interplay between magnetic order and Kondo screening in frustrated heavy-fermion systems.
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BibTeX
@misc{nakahara2026triplon,
title = {{Triplon dynamics from partial Kondo screening in frustrated heavy-fermion systems}},
author = {Hiroki Nakahara and Masahito Mochizuki and Rintaro Eto},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.32283},
eprint = {2610.32283},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.32283},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Triplon dynamics from partial Kondo screening in frustrated heavy-fermion systems
AU - Hiroki Nakahara
AU - Masahito Mochizuki
AU - Rintaro Eto
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.32283
UR - https://arxiv.org/abs/2610.32283
AB - The partially disordered (PD) phase, in which magnetically ordered and Kondo-screened sites coexist, has been proposed as a possible ground state of geometrically frustrated heavy-fermion systems. We investigate its dynamical properties in the half-filled periodic Anderson model on a triangular lattice by calculating the dynamical spin susceptibility within the random-phase approximation built on a self-consistent Hartree-Fock solution. We show that successive quantum phase transitions from the Kondo-insulating phase to the PD phase and to a magnetically ordered phase are driven by the condensation of triplon modes originating predominantly from the Kondo-screened sites. In the PD phase, magnons and triplons coexist and hybridize, leading to characteristic level repulsion in the excitation spectrum. These results reveal how triplet excitations evolve into collective magnetic modes across the successive phase transitions and highlight the dynamical interplay between magnetic order and Kondo screening in frustrated heavy-fermion systems.
ER -