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Directional ballistic transport in the two-dimensional metal PdCoO(2)

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 me...

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Autores principales: 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.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9279146/
https://www.ncbi.nlm.nih.gov/pubmed/35847475
http://dx.doi.org/10.1038/s41567-022-01570-7
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author 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.
author_facet 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.
author_sort Bachmann, Maja D.
collection PubMed
description 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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spelling pubmed-92791462022-07-15 Directional ballistic transport in the two-dimensional metal PdCoO(2) 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. Nat Phys Article 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. Nature Publishing Group UK 2022-05-09 2022 /pmc/articles/PMC9279146/ /pubmed/35847475 http://dx.doi.org/10.1038/s41567-022-01570-7 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
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.
Directional ballistic transport in the two-dimensional metal PdCoO(2)
title Directional ballistic transport in the two-dimensional metal PdCoO(2)
title_full Directional ballistic transport in the two-dimensional metal PdCoO(2)
title_fullStr Directional ballistic transport in the two-dimensional metal PdCoO(2)
title_full_unstemmed Directional ballistic transport in the two-dimensional metal PdCoO(2)
title_short Directional ballistic transport in the two-dimensional metal PdCoO(2)
title_sort directional ballistic transport in the two-dimensional metal pdcoo(2)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9279146/
https://www.ncbi.nlm.nih.gov/pubmed/35847475
http://dx.doi.org/10.1038/s41567-022-01570-7
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