School of Science, Wuhan Institute of Technology, Wuhan, 430205, People's Republic of China.
School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China.
Sci Rep. 2018 Jan 24;8(1):1530. doi: 10.1038/s41598-017-18176-2.
In this paper, we carry out a theoretical investigation on the population dynamics of graphene system under continuous-wave (cw) laser and chirped pulse excitation. Results of our numerical simulations reveal that complete population transfer from an initially occupied ground state to the initially unoccupied excited states can be achieved by choosing appropriate values of the chirp rate, the laser field intensity and frequency, as well as other system parameters. Also, we observe coherent Rabi-like population oscillations between the initial ground state and the excited final state. It is induced by the combined effect of cw and chirped-pulse laser fields. These results will contribute to the understanding of carrier-carrier and carrier-phonon interactions in graphene system, and may find applications in graphene-based high-speed electronic and optoelectronic devices.
在本文中，我们对连续波（cw）激光和啁啾脉冲激发下的石墨烯系统的种群动态进行了理论研究。我们的数值模拟结果表明，通过选择合适的啁啾率、激光场强度和频率以及其他系统参数，可以实现从初始占据的基态到初始未占据的激发态的完全种群转移。此外，我们还观察到初始基态和激发末态之间相干的类 Rabi 种群振荡。这是由 cw 和啁啾脉冲激光场的综合作用引起的。这些结果将有助于理解石墨烯系统中的载流子-载流子和载流子-声子相互作用，并可能在基于石墨烯的高速电子和光电子器件中得到应用。
