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Low-symmetry nonlocal transport in microstructured squares of delafossite metals

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McGuinness,  Philippa H.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhakina,  Elina
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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König,  Markus
Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Khim,  Seunghyun
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  Andrew P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

McGuinness, P. H., Zhakina, E., König, M., Bachmann, M. D., Putzke, C., Moll, P. J. W., et al. (2021). Low-symmetry nonlocal transport in microstructured squares of delafossite metals. Proceedings of the National Academy of Sciences of the United States of America, 118(47): e2113185118, pp. 1-8. doi:10.1073/pnas.2113185118.


Cite as: http://hdl.handle.net/21.11116/0000-0009-B4F1-B
Abstract
Intense work studying the ballistic regime of electron transport in two-dimensional systems based on semiconductors and graphene had been thought to have established most of the key experimental facts of the field. In recent years, however, additional forms of ballistic transport have become accessible in the quasi-two-dimensional delafossite metals, whose Fermi wavelength is a factor of 100 shorter than those typically studied in the previous work and whose Fermi surfaces are nearly hexagonal in shape and therefore strongly faceted. This has some profound consequences for results obtained from the classic ballistic transport experiment of studying bend and Hall resistances in mesoscopic squares fabricated from delafossite single crystals. We observe pronounced anisotropies in bend resistances and even a Hall voltage that is strongly asymmetric in magnetic field. Although some of our observations are nonintuitive at first sight, we show that they can be understood within a nonlocal Landauer-Buttiker analysis tailored to the symmetries of the square/hexagonal geometries of our combined device/Fermi surface system. Signatures of nonlocal transport can be resolved for squares of linear dimension of nearly 100 mu m, approximately a factor of 15 larger than the bulk mean free path of the crystal from which the device was fabricated.