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arXiv 2410.12596cond-mat.mes-hall
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三角相PtBi2纳米结构中的室温平面霍尔效应

Room temperature Planar Hall effect in nanostructures of trigonal-PtBi2

Arthur Veyrat, Klaus Koepernik, Louis Veyrat, Grigory Shipunov, Iryna Kovalchuk, Saicharan Aswartham, Jiang Qu, Ankit Kumar, Michele Ceccardi, Federico Caglieri… 展开作者

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

AI总结:

本研究在三角相PtBi2纳米结构中观测到低磁场下直至室温的强耗散平面霍尔效应,归因于费米能附近的韦尔节点,并讨论了其拓扑与平庸起源,强化了材料的拓扑性质及量子几何效应的影响。

摘要:

三角相PtBi2最近引起了广泛关注,因为它展现出独特的超导拓扑表面态,这些表面态源于连接体韦尔节点的费米弧上的电子配对。此外,理论预测三角相PtBi2中存在拓扑节线,其信号已在磁输运中被测量为无耗散的(即在磁场反转下为奇对称的)反常平面霍尔效应。理解三角相PtBi2中的拓扑超导表面态需要揭示正常态电子波函数的内在几何性质,并需要进一步研究其在电荷输运特性中的标志性特征。在本工作中,我们揭示了在低磁场下直至室温,PtBi2中存在强的耗散性(即在磁场反转下为偶对称的)平面霍尔效应。这种稳健的响应可归因于费米能附近韦尔节点的存在。虽然该效应总体上遵循韦尔半金属中平面霍尔效应的理论预测,但我们表明它在低磁场和高温下偏离理论预期。我们还讨论了我们的材料中平面霍尔效应的起源,以及PtBi2中拓扑特征及其可能的平庸起源的贡献。我们的结果强化了PtBi2的拓扑性质,以及量子几何效应对低能正常态电子输运性质的强烈影响。

英文摘要:

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.

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