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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, 18(7), 819-824. doi:10.1038/s41567-022-01570-7.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-7531-A Version Permalink: https://hdl.handle.net/21.11116/0000-000B-7547-2
Genre: Journal Article

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https://doi.org/10.1038/s41567-022-01570-7 (Publisher version)
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 Creators:
Bachmann, Maja D.1, Author
Sharpe, Aaron L.1, Author
Baker, Graham1, Author
Barnard, Arthur W.1, Author
Putzke, Carsten1, Author
Scaffidi, Thomas1, Author
Nandi, Nabhanila1, Author
McGuinness, Philippa H.1, Author
Zhakina, Elina1, Author
Moravec, Michal1, Author
Khim, Seunghyun1, Author
Konig, Markus1, Author
Goldhaber-Gordon, David1, Author
Bonn, Douglas A.1, Author
Mackenzie, Andrew P.1, Author
Moll, Philip J. W.1, Author
Affiliations:
1external, ou_persistent22              

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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
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41567-022-01570-7
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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: 18 (7) Sequence Number: - Start / End Page: 819 - 824 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850