Chiral Weyl-Kondo semimetallic state through enhanced correlation in CeGaGe
Abstract
Strongly correlated chiral materials have been proposed to host a chiral Weyl-Kondo semimetal (cWKSM) state, in which Kondo hybridization pins chirality-induced Kramers-Weyl point crossings, together with additional symmetry-enforced band crossings, near the Fermi level. Realizing this state requires a material that combines crystal chirality, non-symmorphic symmetry, and Kondo correlations, and currently there are no known materials that combine all these requirements. Here we report evidence for a cWKSM state in CeGaGe, a member of the RXY (R = rare earth; X = Al, Si; Y = Ga, Ge) family. Magnetization measurements confirm long-range antiferromagnetic order below TN = 4.7 K with a complex, canted magnetic structure. Unique to CeGaGe among the known RXY systems is a structural transition from an achiral tetragonal I41md structure (at high temperatures) to the chiral tetragonal P43 structure (at low temperatures). The structural transition in CeGaGe allows us to highlight the role of chirality in stabilizing the Kramers cWKSM state. Hall resistivity measurements with $H || c$ reveal an anomalous Hall conductivity (AHC) that is constant below the Kondo temperature TK ≈ 7 K and drops sharply above it. This crossover tracks the onset of Kondo coherence rather than the magnetic ordering, which occurs at TN = 4.7 K. Together with first-principles calculations for the P43 structure, this identifies the AHC as an intrinsic, Berry-curvature-driven contribution generated by Kondo hybridization, rather than a consequence of extrinsic scattering or dynamic scalar spin chirality. These results establish CeGaGe as a rare experimental platform in which crystal chirality, strong electronic correlations, and non-trivial band topology coexist, providing the first material realization of a Kondo-driven cWKSM state.
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BibTeX
@misc{arushi2026chiral,
title = {{Chiral Weyl-Kondo semimetallic state through enhanced correlation in CeGaGe}},
author = {Arushi and Kevin Allen and Yuan Fang and Kuan-Sen Lin and Mounica Mahankali and Hari Bhandari and Karthik Rao and Alberto Ruiz Biestro and Christopher Lane and Jian-Xin Zhu and Sanu Mishra and Geoffroy Hautier and Qimiao Si and Emilia Morosan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.32012},
eprint = {2609.32012},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.32012},
}
RIS
TY - UNPB
TI - Chiral Weyl-Kondo semimetallic state through enhanced correlation in CeGaGe
AU - Arushi
AU - Kevin Allen
AU - Yuan Fang
AU - Kuan-Sen Lin
AU - Mounica Mahankali
AU - Hari Bhandari
AU - Karthik Rao
AU - Alberto Ruiz Biestro
AU - Christopher Lane
AU - Jian-Xin Zhu
AU - Sanu Mishra
AU - Geoffroy Hautier
AU - Qimiao Si
AU - Emilia Morosan
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2609.32012
UR - https://arxiv.org/abs/2609.32012
AB - Strongly correlated chiral materials have been proposed to host a chiral Weyl-Kondo semimetal (cWKSM) state, in which Kondo hybridization pins chirality-induced Kramers-Weyl point crossings, together with additional symmetry-enforced band crossings, near the Fermi level. Realizing this state requires a material that combines crystal chirality, non-symmorphic symmetry, and Kondo correlations, and currently there are no known materials that combine all these requirements. Here we report evidence for a cWKSM state in CeGaGe, a member of the RXY (R = rare earth; X = Al, Si; Y = Ga, Ge) family. Magnetization measurements confirm long-range antiferromagnetic order below T_N = 4.7 K with a complex, canted magnetic structure. Unique to CeGaGe among the known RXY systems is a structural transition from an achiral tetragonal I4_1md structure (at high temperatures) to the chiral tetragonal P4_3 structure (at low temperatures). The structural transition in CeGaGe allows us to highlight the role of chirality in stabilizing the Kramers cWKSM state. Hall resistivity measurements with $H || c$ reveal an anomalous Hall conductivity (AHC) that is constant below the Kondo temperature T_K ≈ 7 K and drops sharply above it. This crossover tracks the onset of Kondo coherence rather than the magnetic ordering, which occurs at T_N = 4.7 K. Together with first-principles calculations for the P4_3 structure, this identifies the AHC as an intrinsic, Berry-curvature-driven contribution generated by Kondo hybridization, rather than a consequence of extrinsic scattering or dynamic scalar spin chirality. These results establish CeGaGe as a rare experimental platform in which crystal chirality, strong electronic correlations, and non-trivial band topology coexist, providing the first material realization of a Kondo-driven cWKSM state.
ER -