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Bibliographic Details
Main Authors:	Pradhan, Suman Kalyan, Ma, Xiaoming, Wang, Jicheng, Liu, Weiqi, Dai, Yue, Chen, Wenxing, Ma, Xiaobai, Yang, Wenyun, Wu, Yu, Luo, Zhaochu, Datta, Raktim, Bera, Arnab, DuttaGupta, Samik, Yang, Jinbo, Hou, Yanglong, Liu, Chang, Wu, Rui
Format:	Preprint
Published:	2026
Subjects:	Materials Science
Online Access:	https://arxiv.org/abs/2601.18160
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Table of Contents:

Magnetic-field-driven Lifshitz transitions are typically considered zero-temperature phenomena involving Fermi-surface reconstruction without symmetry breaking. Here, we report an unconventional Lifshitz transition in TaCo2Te2 that emerges exclusively within a narrow finite-temperature window under cooperative tuning by both temperature and magnetic field. Bulk-sensitive transport and thermoelectric measurements demonstrate continuous Fermi-surface renormalization at low temperatures, where the transition is sharply triggered by a critical magnetic field. Crucially, neutron diffraction reveals the absence of structural or magnetic phase transitions, while angle-resolved photoemission spectroscopy shows no spectral anomalies in electronic structure without magnetic field. These observations constrain the mechanism to a Zeeman-driven process invisible to equilibrium probes, establishing a paradigm where Fermi-surface topology is jointly controlled by temperature and magnetic field.

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