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  Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2

Bachmann, M. D., Sharpe, A. L., Barnard, A. W., Putzke, C., König, M., Khim, S., et al. (2019). Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2. Nature Communications, 10: 5081, pp. 1-8. doi:10.1038/s41467-019-13020-9.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4D60-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4D62-7
Genre: Journal Article

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 Creators:
Bachmann, Maja D.1, Author              
Sharpe, Aaron L.2, Author
Barnard, Arthur W.2, Author
Putzke, Carsten3, Author              
König, Markus4, Author              
Khim, Seunghyun1, Author              
Goldhaber-Gordon, David2, 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: Geometric electron optics may be implemented in solids when electron transport is ballistic on the length scale of a device. Currently, this is realized mainly in 2D materials characterized by circular Fermi surfaces. Here we demonstrate that the nearly perfectly hexagonal Fermi surface of PdCoO2 gives rise to highly directional ballistic transport. We probe this directional ballistic regime in a single crystal of PdCoO2 by use of focused ion beam (FIB) micro-machining, defining crystalline ballistic circuits with features as small as 250 nm. The peculiar hexagonal Fermi surface naturally leads to enhanced electron self-focusing effects in a magnetic field compared to circular Fermi surfaces. This super-geometric focusing can be quantitatively predicted for arbitrary device geometry, based on the hexagonal cyclotron orbits appearing in this material. These results suggest a novel class of ballistic electronic devices exploiting the unique transport characteristics of strongly faceted Fermi surfaces.

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Language(s): eng - English
 Dates: 2019-11-082019-11-08
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 10 Sequence Number: 5081 Start / End Page: 1 - 8 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723