Current vortices in hexagonal graphene quantum dots
arXiv:2103.09337 · doi:10.1103/PhysRevB.104.165408
Abstract
Newly synthesized nanostructures of graphene appear as a promising breeding ground for new technology. Therefore, it is important to identify the role played by the boundary conditions in their electronic features. In this contribution we use the non-equilibrium Green's function method coupled to tight-binding theory to calculate and compare the current patterns of hexagonal graphene quantum dots, with contacts placed at different edge locations. Our results reveal the formation of current vortices when the symmetry of the contact geometry is in conflict with the symmetries of the quantum dot. The presence of current vortices suggests the use of graphene quantum dots as nanomagnets or magnetic nanosensors.
arXiv commentNew figures were added: which are figs. 9, 10 and 11. New sections were added, which are: Sec. IV A, B, C and D
References in corpus (32)
- Negative local resistance caused by viscous electron backflow in graphene
- Mayavi: a package for 3D visualization of scientific data
- Hydrodynamics of electrons in graphene
- Electron Viscosity, Current Vortices and Negative Nonlocal Resistance in Graphene
- Conductance quantization and transport gap in disordered graphene nanoribbons
- Quantum conductance of graphene nanoribbons with edge defects
- The recursive Green's function method for graphene
- Energy levels of triangular and hexagonal graphene quantum dots: a comparative study between the tight-binding and the Dirac approach
- Robustness of edge states in graphene quantum dots
- Applicability of the Wide-Band Limit in DFT-Based Molecular Transport Calculations
- A spin-filter device based on armchair graphene nanoribbons
- Effective contact model for transport through weakly-doped graphene
- Current splitting and valley polarization in elastically deformed graphene
- Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene
- Circular Currents in Molecular Wires
- Current flow paths in deformed graphene: from quantum transport to classical trajectories in curved space
- Classical and Quantum Plasmonics in Graphene Nanodisks: the Role of Edge States
- Vorticity induced negative nonlocal resistance in viscous two-dimensional electron system
- Hydrodynamic and ballistic transport over large length scales in GaAs/AlGaAs
- Long-range nontopological edge currents in charge-neutral graphene
- Spectrum of -electrons in Graphene As a Macromolecule
- Trapping and guiding surface plasmons in curved graphene landscapes
- Calculating Green Functions from Finite Systems
- Vorticity of viscous electronic flow in graphene
- Symmetry and optical selection rules in graphene quantum dots
- Tuning transport properties on graphene multi-terminal structures by mechanical deformations
- Magnetotransport along a boundary: From coherent electron focusing to edge channel transport
- Magnetic edge states in Aharonov-Bohm graphene quantum rings
- Current vortices in aromatic carbon molecules
- Spatial Current Patterns, Dephasing and Current Imaging in Graphene Nanoribbons
- Magnetism and Spin Transport of Carbon Chain between Armchair Graphene Nanoribbon electrodes
- Circulating persistent current and induced magnetic field in a fractal network