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SUMMARY:Ballistic electrons on the hexagonal Fermi surface of PdCoO2 - Maj
 a Bachmann\, Max-Planck-Institute for Chemical Physics of Solids\, Dresden
DTSTART:20181121T111500Z
DTEND:20181121T123000Z
UID:TALK114349@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:Electronic transport in metals is typically diffusive and well
  described by Ohm's law. Very small or clean conductors\, however\, can en
 ter the ballistic regime when the mean-free-path exceeds the size of the s
 ample. This transport regime has been well studied in two-dimensional elec
 tron gases\, in which the charge carriers are well described by small\, ci
 rcular Fermi surfaces.\n\nIn the ultra-pure delafossite metal PdCoO2\, how
 ever\, the electronic system is described by a nearly perfect hexagonal Fe
 rmi surface\, resulting in three preferred directions of ballistic motion.
  Exploiting the mean-free-path of over 20µm at low temperatures\, we use 
 focused ion beam microstructuring to fabricate ballistic devices from sing
 le crystals.\n\nI will present our investigations of constricted channels 
 and transverse electron focusing devices which demonstrate the effects of 
 this peculiar Fermi surface. Ballistic transport simulations further corro
 borate our experimental results. This is particularly relevant in establis
 hing a complete picture of the exotic ballistic motion in PdCoO2\, on top 
 of which strong momentum-conserving scattering processes have been argued 
 to lead to hydrodynamic transport.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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