Honeycomb antidot artificial lattice as a prototypical correlated Dirac fermion system

Biborski, A.; Zegrodnik, M.; Wójcik, P.; Nowak, M. P.

doi:10.1103/physrevb.108.235119

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Although the work focuses primarily on graphene, recent progress in the fabrication of semiconductor artificial graphenes [70,71] suggests that our results may also be relevant to such systems.…”

Section: Discussionmentioning

confidence: 99%

Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

Rycerz,

Witkowski

2024

Materials

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Highly doped graphene samples show reduced conductance and enhanced shot-noise power compared with standard ballistic systems in two-dimensional electron gas. These features can be understood within a model that assumes incoherent scattering of Dirac electrons between two interfaces separating the sample and the leads. Here we find, by adopting the above model for the edge-free (Corbino) geometry and by computer simulation of quantum transport, that another graphene-specific feature should be observable when the current flow through a doped disk is blocked by a strong magnetic field. When the conductance drops to zero, the Fano factor approaches the value of F≈0.56, with a very weak dependence on the ratio of the disk radii. The role of finite source-drain voltages and the system behavior when the electrostatic potential barrier is tuned from a rectangular to a parabolic shape are also discussed.

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Section: Discussionmentioning

confidence: 99%

Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

Rycerz,

Witkowski

2024

Materials

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Ferromagnetic Semimetal and Charge-Density Wave Phases of Interacting Electrons in a Honeycomb Moiré Potential

Yang,

Morales,

Zhang

2024

Phys. Rev. Lett.

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Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

Rycerz,

Witkowski

2024

Preprint

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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.

show abstract

Honeycomb antidot artificial lattice as a prototypical correlated Dirac fermion system

Cited by 3 publications

References 35 publications

Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

Ferromagnetic Semimetal and Charge-Density Wave Phases of Interacting Electrons in a Honeycomb Moiré Potential

Sub-Sharvin Conductance and Incoherent Shot-Noise in Graphene Disks at Magnetic Field

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