Directional ballistic transport in the two-dimensional metal PdCoO2

Bachmann, Maja D.; Sharpe, Aaron L.; Baker, Graham; Barnard, Arthur W.; Putzke, Carsten; Scaffidi, Thomas; Nandi, Nabhanila; McGuinness, Philippa H.; Zhakina, Elina; Moravec, Michal; Khim, Seunghyun; König, Markus; Goldhaber-Gordon, David; Bonn, Douglas A.; Mackenzie, Andrew P.; Moll, Philip J. W.

doi:10.1038/s41567-022-01570-7

Title: Directional ballistic transport in the two-dimensional metal PdCoO2

Journal Article · 08 May 2022 · Nature Physics

DOI: https://doi.org/10.1038/s41567-022-01570-7 · OSTI ID:1867064

;

; Barnard, Arthur W.;

; Scaffidi, Thomas; Nandi, Nabhanila;

; Zhakina, Elina;

;

; König, Markus;

;

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 PdCoO ₂ 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: ARCS Foundation Fellowship; Engineering and Physical Sciences Research Council (EPSRC); European Research Council (ERC); European Union’s Horizon 2020; Ford Foundation Predoctoral Fellowship; Gordon and Betty Moore Foundation; International Max Planck Research School for Chemistry and Physics of Quantum Materials; National Science Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE; USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1867064

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 7 Vol. 18; ISSN 1745-2473

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: France

Language:: English

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