The influence of the optical Stark effect on chiral tunneling in graphene
Department of Physics, Nanchang University - Nanchang 330031, China
2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences Hefei 230031, China
3 Department of Physics, Capital Normal University - Beijing 100037, China
Accepted: 1 June 2011
The influences of intense coherent laser fields on the transport properties of a single-layer graphene are investigated by solving the time-dependent Dirac equation numerically. Under an intense laser field, the valence band and conduction band states mix via the optical Stark effect. The chiral symmetry of Dirac electrons is broken and the perfect chiral tunneling is strongly suppressed. These properties might be useful in the fabrication of an optically controlled field-effect transistor.
PACS: 42.65.-k – Nonlinear optics / 68.65.-k – Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties / 73.40.Gk – Tunneling
© EPLA, 2011