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Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field
Version 1
: Received: 22 April 2024 / Approved: 23 April 2024 / Online: 23 April 2024 (09:43:55 CEST)
A peer-reviewed article of this Preprint also exists.
Rycerz, A.; Rycerz, K.; Witkowski, P. Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field. Materials 2024, 17, 3067. Rycerz, A.; Rycerz, K.; Witkowski, P. Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field. Materials 2024, 17, 3067.
Abstract
Highly-doped graphene samples show the conductance reduced and the shot-noise
power enhanced compared to standard ballistic systems in two-dimensional
electron gas. These features can be understood within a model assuming
incoherent scattering of Dirac electrons between two interfaces separating the
sample and the leads. Here we find, by adopting the above-mentioned model for
the edge-free (Corbino) geometry and by means of the computer simulation of
quantum transport, that another graphene-specific feature should be observable
when the current flow through a doped disk is blocked by high magnetic field.
In case the conductance drops to zero, the Fano factor approaches the value of
$F\approx{}0.56$, with a very weak dependence on the disk radii ratio. The role
of finite source-drain voltages and the system behavior upon tuning the
electrostatic potential barrier from a rectangular to parabolic shape are also
discussed.
Keywords
graphene; shot noise; Corbino disk; Landauer-Büttiker formalism
Subject
Physical Sciences, Condensed Matter Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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