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  Directional ballistic transport in the two-dimensional metal PdCoO2

Bachmann, M. D., Sharpe, A. L., Baker, G., Barnard, A. W., Putzke, C., Scaffidi, T., et al. (2022). Directional ballistic transport in the two-dimensional metal PdCoO2. Nature Physics, 1-7. Retrieved from https://doi.org/10.1038/s41567-022-01570-7.

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 Creators:
Bachmann, Maja D.1, Author              
Sharpe, Aaron L.2, Author
Baker, Graham2, Author
Barnard, Arthur W.2, Author
Putzke, Carsten3, Author              
Scaffidi, Thomas2, Author
Nandi, Nabhanila1, Author              
McGuinness, Philippa H.1, Author              
Zhakina, Elina1, Author              
Moravec, Michal1, Author              
Khim, Seunghyun1, Author              
König, Markus4, Author              
Goldhaber-Gordon, David2, Author
Bonn, Douglas A.2, Author
Mackenzie, Andrew P.5, Author              
Moll, Philip J. W.3, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466701              
4Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863470              
5Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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 Abstract: In an idealized infinite crystal, the material properties are constrained by the symmetries of the unit cell. The point-group symmetry is broken by the sample shape of any finite crystal, but this is commonly unobservable in macroscopic metals. To sense the shape-induced symmetry lowering in such metals, long-lived bulk states originating from an anisotropic Fermi surface are needed. Here we show how a strongly facetted Fermi surface and the long quasiparticle mean free path present in microstructures of PdCoO2 yield an in-plane resistivity anisotropy that is forbidden by symmetry on an infinite hexagonal lattice. We fabricate bar-shaped transport devices narrower than the mean free path from single crystals using focused ion beam milling, such that the ballistic charge carriers at low temperatures frequently collide with both of the side walls that define the channel. Two symmetry-forbidden transport signatures appear: the in-plane resistivity anisotropy exceeds a factor of 2, and a transverse voltage appears in zero magnetic field. Using ballistic Monte Carlo simulations and a numerical solution of the Boltzmann equation, we identify the orientation of the narrow channel as the source of symmetry breaking.

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Language(s): eng - English
 Dates: 2022-05-092022-05-09
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: URI: https://doi.org/10.1038/s41567-022-01570-7
Other: Bachmann2022
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 7 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850