Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi

Erjian Cheng (), Limin Yan, Xianbiao Shi, Rui Lou (), Alexander Fedorov, Mahdi Behnami, Jian Yuan, Pengtao Yang, Bosen Wang, Jin-Guang Cheng, Yuanji Xu, Yang Xu, Wei Xia, Nikolai Pavlovskii, Darren C. Peets, Weiwei Zhao, Yimin Wan, Ulrich Burkhardt, Yanfeng Guo, Shiyan Li, Claudia Felser, Wenge Yang () and Bernd Büchner ()
Additional contact information
Erjian Cheng: Leibniz Institute for Solid State and Materials Research (IFW-Dresden)
Limin Yan: Center for High Pressure Science and Technology Advanced Research
Xianbiao Shi: Harbin Institute of Technology
Rui Lou: Leibniz Institute for Solid State and Materials Research (IFW-Dresden)
Alexander Fedorov: Leibniz Institute for Solid State and Materials Research (IFW-Dresden)
Mahdi Behnami: Leibniz Institute for Solid State and Materials Research (IFW-Dresden)
Jian Yuan: ShanghaiTech University
Pengtao Yang: Chinese Academy of Sciences
Bosen Wang: Chinese Academy of Sciences
Jin-Guang Cheng: Chinese Academy of Sciences
Yuanji Xu: University of Science and Technology Beijing
Yang Xu: East China Normal University
Wei Xia: ShanghaiTech University
Nikolai Pavlovskii: Technische Universität Dresden
Darren C. Peets: Technische Universität Dresden
Weiwei Zhao: Harbin Institute of Technology
Yimin Wan: Fudan University
Ulrich Burkhardt: Max Planck Institute for Chemical Physics of Solids
Yanfeng Guo: ShanghaiTech University
Shiyan Li: Fudan University
Claudia Felser: Max Planck Institute for Chemical Physics of Solids
Wenge Yang: Center for High Pressure Science and Technology Advanced Research
Bernd Büchner: Leibniz Institute for Solid State and Materials Research (IFW-Dresden)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneous space-inversion and time-reversal symmetry breaking provides a unique platform for exploring novel topological states. Here, by employing multiple experimental techniques, we demonstrate that ferromagnetism and pressure can serve as efficient parameters to tune the positions of Weyl nodes in CeAlSi. At ambient pressure, a magnetism-facilitated anomalous Hall/Nernst effect (AHE/ANE) is uncovered. Angle-resolved photoemission spectroscopy (ARPES) measurements demonstrated that the Weyl nodes with opposite chirality are moving away from each other upon entering the ferromagnetic phase. Under pressure, by tracing the pressure evolution of AHE and band structure, we demonstrate that pressure could also serve as a pivotal knob to tune the positions of Weyl nodes. Moreover, multiple pressure-induced phase transitions are also revealed. These findings indicate that CeAlSi provides a unique and tunable platform for exploring exotic topological physics and electron correlations, as well as catering to potential applications, such as spintronics.

Date: 2024
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DOI: 10.1038/s41467-024-45658-5

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