▎ 摘　　要

The tight-binding method is employed to investigate the single-electron electronic structure of triangular graphene quantum dots subject to non-uniform electric fields. The specially designed non-uniform electric fields can provide the equal or opposite electrostatic potentials for all edge carbon atoms. The low-energy eigenstates do not vary significantly with the non-uniform electric fields, which allows electrical linear control of the low-energy states. Moreover, the levels of degenerate zero-energy states can be adjusted electrically independently while the levels of nonzero-energy states almost do not vary. This linear control by non-uniform electric fields can be a more efficient way to tune the degenerate zero-energy states. Our findings may be useful for the application of graphene quantum dots to electronic and photovoltaic devices. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.