Carrier duality from the convergence of Dirac fermions and high-order van Hove singularities
Abstract
The convergence of highly mobile Dirac fermions and flat-band heavy electrons offers a paradigm for emergent quantum phenomena. However, experimental realization of such intriguing state remains elusive. In this study, we report a dual carrier regime in the kagome metal Co3In2S2, wherein the charge transport is governed by high-mobility electrons while the thermodynamic responses exhibit heavy-electron behavior. This exotic duality arises from the coexistence of topological Dirac fermions and flat-band high-order (4th-order) Van Hove singularities (HOVHSs) at the Fermi surface, as revealed by magnetic-torque quantum oscillation and angle-resolved photoemission spectroscopy. The interaction between Dirac and HOVHS-derived carriers can be captured by a minimal two-pocket model, manifesting as sublinear resistivity above ~100 K and field-induced non-Fermi-liquid behavior at low temperatures. Our study establishes Co3In2S2 as a model platform for exploring many-body physics at the intersection of topology and correlation effects, and provides a foundational framework for designing quantum materials hosting diverse emergent states.
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BibTeX
@misc{lyu2026carrier,
title = {{Carrier duality from the convergence of Dirac fermions and high-order van Hove singularities}},
author = {Meng Lyu and Kaiyi Zhai and Nikolai Peshcherenko and Junyan Liu and Jinying Yang and Subir Sen and Binbin Wang and Langsheng Ling and Zhaosheng Wang and Gang Li and Jieyi Liu and Yang Xu and Xiyang Li and Claudia Felser and Yang Zhang and Wujun Shi and Lexian Yang and Enke Liu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.24044},
eprint = {2609.24044},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.24044},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Carrier duality from the convergence of Dirac fermions and high-order van Hove singularities
AU - Meng Lyu
AU - Kaiyi Zhai
AU - Nikolai Peshcherenko
AU - Junyan Liu
AU - Jinying Yang
AU - Subir Sen
AU - Binbin Wang
AU - Langsheng Ling
AU - Zhaosheng Wang
AU - Gang Li
AU - Jieyi Liu
AU - Yang Xu
AU - Xiyang Li
AU - Claudia Felser
AU - Yang Zhang
AU - Wujun Shi
AU - Lexian Yang
AU - Enke Liu
PY - 2026
DA - 2026/09/21
PB - arXiv
DO - 10.48550/arxiv.2609.24044
UR - https://arxiv.org/abs/2609.24044
AB - The convergence of highly mobile Dirac fermions and flat-band heavy electrons offers a paradigm for emergent quantum phenomena. However, experimental realization of such intriguing state remains elusive. In this study, we report a dual carrier regime in the kagome metal Co3In2S2, wherein the charge transport is governed by high-mobility electrons while the thermodynamic responses exhibit heavy-electron behavior. This exotic duality arises from the coexistence of topological Dirac fermions and flat-band high-order (4th-order) Van Hove singularities (HOVHSs) at the Fermi surface, as revealed by magnetic-torque quantum oscillation and angle-resolved photoemission spectroscopy. The interaction between Dirac and HOVHS-derived carriers can be captured by a minimal two-pocket model, manifesting as sublinear resistivity above ~100 K and field-induced non-Fermi-liquid behavior at low temperatures. Our study establishes Co3In2S2 as a model platform for exploring many-body physics at the intersection of topology and correlation effects, and provides a foundational framework for designing quantum materials hosting diverse emergent states.
ER -