Observation of Superluminal in Doppler Broadened Two-Level Atomic Systems in Magnetic Field

This is the authors' abstract. We don't add key points for this paper.

A novel method to control the group velocity of light propagation in a two-level atomic system without additional optical field is proposed. Numerical result and experimental data shows that by changing the magnetic field intensity and vapor temperature, the group velocity of probe light can be controlled in an appropriate region.