Electron transport properties of graphene nanoribbons with Gaussian deformation
arXiv:2005.04497 · doi:10.1103/PhysRevB.102.075425
Abstract
Gaussian deformation in graphene structures exhibits an interesting effect in which flower-shaped confinement states are observed in the deformed region [Carrillo-Bastos et al., Phys. Rev. B 90 041411 (2014)]. To exploit such a deformation for various applications, tunable electronic features including a bandgap opening for semi-metallic structures are expected. Besides, the effects of disorders and external excitations also need to be considered. In this work, we present a systematic study on quantum transport of graphene ribbons with Gaussian deformation. Different levels of deformation are explored to find a universal behavior of the electron transmission. Using a tight-binding model in combination with Non-Equilibrium Green Functions formalism, we show that Gaussian deformation influences strongly the electronic properties of ribbons in which the electron transmission decreases remarkably in high energy regions even if small deformations are considered. Interestingly, it unveils that the first plateau of the transmission of semi-metallic armchair ribbons is just weakly affected in the case of small deformations. However, significant large Gaussian bumps can induce a strong drop of this plateau and a transport gap is formed. The transmission at the zero energy is found to decrease exponentially with increasing the size of the Gaussian bump. Moreover, the gap of semi-conducting ribbons is enlarged with large deformations. The opening or the widening of the transport gap in large deformed armchair structures is interpreted by a formation of a three-zone behavior along the transport direction of the hopping profile. On the other hand, a transport gap is not observed in zigzag ribbons regardless of the size of Gaussian bumps. This behavior is due to the strong localization of edge states at the energy point E = 0...
arXiv comment25 pages, 12 figures
References in corpus (26)
- The electronic properties of graphene
- Imaging Grains and Grain Boundaries in Single-Layer Graphene: An Atomic Patchwork Quilt
- A tight-binding approach to uniaxial strain in graphene
- Charge Transport in Disordered Graphene-Based Low Dimensional Materials
- Enhanced thermoelectric figure of merit in edge disordered zigzag graphene nanoribbons
- The recursive Green's function method for graphene
- Tuning the pseudospin polarization of graphene by a pseudo-magnetic field
- Band-Selective Filter in a Zigzag Graphene Nanoribbon
- Current flow paths in deformed graphene: from quantum transport to classical trajectories in curved space
- Gaussian deformations in graphene ribbons: flowers and confinement
- Electronic states in a graphene flake strained by a Gaussian bump
- Local sublattice symmetry breaking for graphene with a centro-symmetric deformation
- Local versus extended deformed graphene geometries for valley filtering
- Electronic transport across linear defects in graphene
- Anderson disorder in graphene nanoribbons: A local distribution approach
- Conductance signatures of electron confinement induced by strained nanobubbles in graphene
- Valley notch filter in a graphene strain superlattice: Green's function and machine learning approach
- Tuning transport properties on graphene multi-terminal structures by mechanical deformations
- Strained graphene Hall bar
- Tuning edge state localization in graphene nanoribbons by in-plane bending
- Electric gating induced bandgaps and enhanced Seebeck effect in zigzag bilayer graphene ribbons
- Sublattice symmetry breaking and Kondo-effect enhancement in strained graphene
- Theory of the Strain-Induced Magnetoelectric Effect in Planar Dirac Systems
- Energy transfer channels of the plasmon excitation process in STM tunnel junctions
- Graphene Nanoribbons: from chemistry to circuits
- The influence of Gaussian strain on sublattice selectivity of impurities in graphene