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

Maja D. Bachmann (), Aaron L. Sharpe, Arthur W. Barnard, Carsten Putzke, Markus König, Seunghyun Khim, David Goldhaber-Gordon, Andrew P. Mackenzie and Philip J. W. Moll ()
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Maja D. Bachmann: Max Planck Institute for Chemical Physics of Solids
Aaron L. Sharpe: Stanford University
Arthur W. Barnard: Stanford University
Carsten Putzke: Max Planck Institute for Chemical Physics of Solids
Markus König: Max Planck Institute for Chemical Physics of Solids
Seunghyun Khim: Max Planck Institute for Chemical Physics of Solids
David Goldhaber-Gordon: SLAC National Accelerator Laboratory
Andrew P. Mackenzie: Max Planck Institute for Chemical Physics of Solids
Philip J. W. Moll: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13020-9

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