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Room temperature Planar Hall effect in nanostructures of trigonal-PtBi2
by Arthur Veyrat, Klaus Koepernik, Louis Veyrat, Grigory Shipunov, Iryna Kovalchuk, Saicharan Aswartham, Jiang Qu, Ankit Kumar, Michele Ceccardi, Federico Caglieris, Nicolás Pérez Rodríguez, Romain Giraud, Bernd Büchner, Jeroen van den Brink, Carmine Ortix, Joseph Dufouleur
Submission summary
| Authors (as registered SciPost users): | Arthur Veyrat |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2410.12596v2 (pdf) |
| Date submitted: | 2025-03-25 11:35 |
| Submitted by: | Veyrat, Arthur |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
Trigonal-PtBi2 has recently garnered significant interest as it exhibits unique superconducting topological surface states due to electron pairing on Fermi arcs connecting bulk Weyl nodes. Furthermore, topological nodal lines have been predicted in trigonal-PtBi2, and their signature was measured in magnetotransport as a dissipationless, i.e. odd under a magnetic field reversal, anomalous planar Hall effect. Understanding the topological superconducting surface state in trigonal-PtBi2 requires unravelling the intrinsic geometric properties of the normal state electronic wavefunctions and further studies of their hallmarks in charge transport characteristics are needed. In this work, we reveal the presence of a strong dissipative, i.e. even under a magnetic field reversal, planar Hall effect in PtBi2 at low magnetic fields and up to room temperature. This robust response can be attributed to the presence of Weyl nodes close to the Fermi energy. While this effect generally follows the theoretical prediction for a planar Hall effect in a Weyl semimetal, we show that it deviates from theoretical expectations at both low fields and high temperatures. We also discuss the origin of the PHE in our material, and the contributions of both the topological features in PtBi2 and its possible trivial origin. Our results strengthen the topological nature of PtBi2 and the strong influence of quantum geometric effects on the electronic transport properties of the low energy normal state.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
Author comments upon resubmission
We note that an author (Iryna Kovalchuk, who contributed to the crystal growth) was mistakenly omitted in the previously submitted version. This mistake has been fixed in the present version.
List of changes
We have implemented multiple modifications to the manuscript in response, mainly by clarifying the link between this study and Ref. 19 (now Ref. 12), more details on the analysis, more clarity on the different Weyl nodes in the system, a dedicated Methods section, and additional details about the samples.
We also added more information about the samples (in methods and SM), we show the measurements from additional contact configurations (in SM), provide a more detailed discussion of the Weyl nodes contribution to the PHE, and clarify the link between this study and Reference 19 (now Ref. 12, in the introduction).
For more details, see the response to reviewers.