Current vortices in hexagonal graphene quantum dots
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.
Cite
@article{arxiv.2103.09337,
title = {Current vortices in hexagonal graphene quantum dots},
author = {Eudes Gomes and Fernando Moraes},
journal= {arXiv preprint arXiv:2103.09337},
year = {2021}
}
Comments
New figures were added: which are figs. 9, 10 and 11. New sections were added, which are: Sec. IV A, B, C and D