Coherent Excitonic Wavepackets in Two-Dimensional Square Dot Arrays Driven by an In-Plane Uniform Electric Field
LI Xiu-Ping1, YAN Wei-Xian1,2
1Department of Physics, Shanxi University, Taiyuan 030006
2Labratory for Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088
Coherent Excitonic Wavepackets in Two-Dimensional Square Dot Arrays Driven by an In-Plane Uniform Electric Field
LI Xiu-Ping1;YAN Wei-Xian1,2
1Department of Physics, Shanxi University, Taiyuan 030006
2Labratory for Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088
Abstract： We investigate the evolution behaviour of electron-hole pair wavepacket in optically excited square quantum-dot arrays driven by in-plane (x-y plane) uniform electric field E (viz, E = Exex + Eyey, ex, ey are unit vectors along x and y directions respectively), in the time domain. It is found that if the ratio of the x-component electric field Ex to the y-component electric field Ey is a rational p/q (p and q being coprime integer numbers), the wavepackets undergo a time-periodic breathing mode, with the period 2πp/ωBx, where ωBx = eExa/ħ, with a being the lattice constant of square dot arrays, ħ being Planck's constant, e being the electron charge. This finding provides a time-domain demonstration of the recent spectral result [Phys. Rev. Lett. {86} (2001) 3116].
LI Xiu-Ping;YAN Wei-Xian;. Coherent Excitonic Wavepackets in Two-Dimensional Square Dot Arrays Driven by an In-Plane Uniform Electric Field[J]. 中国物理快报, 2004, 21(1): 197-200.
LI Xiu-Ping, YAN Wei-Xian,. Coherent Excitonic Wavepackets in Two-Dimensional Square Dot Arrays Driven by an In-Plane Uniform Electric Field. Chin. Phys. Lett., 2004, 21(1): 197-200.
2004, Vol. 21 
