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CATEGORIES:Quantum Matter Seminar
SUMMARY:Ballistic electrons on the hexagonal Fermi surface
  of PdCoO2 - Maja Bachmann\, Max-Planck-Institute 
 for Chemical Physics of Solids\, Dresden
DTSTART;TZID=Europe/London:20181121T111500
DTEND;TZID=Europe/London:20181121T123000
UID:TALK114349AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/114349
DESCRIPTION:Electronic transport in metals is typically diffus
 ive and well described by Ohm's law. Very small or
  clean conductors\, however\, can enter the ballis
 tic regime when the mean-free-path exceeds the siz
 e of the sample. This transport regime has been we
 ll studied in two-dimensional electron gases\, in 
 which the charge carriers are well described by sm
 all\, circular Fermi surfaces.\n\nIn the ultra-pur
 e delafossite metal PdCoO2\, however\, the electro
 nic system is described by a nearly perfect hexago
 nal Fermi surface\, resulting in three preferred d
 irections of ballistic motion. Exploiting the mean
 -free-path of over 20µm at low temperatures\, we u
 se focused ion beam microstructuring to fabricate 
 ballistic devices from single crystals.\n\nI will 
 present our investigations of constricted channels
  and transverse electron focusing devices which de
 monstrate the effects of this peculiar Fermi surfa
 ce. Ballistic transport simulations further corrob
 orate our experimental results. This is particular
 ly relevant in establishing a complete picture of 
 the exotic ballistic motion in PdCoO2\, on top of 
 which strong momentum-conserving scattering proces
 ses have been argued to lead to hydrodynamic trans
 port.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, D
 epartment of Physics
CONTACT:Romy Hall
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