Chin. Phys. Lett.  2004, Vol. 21 Issue (1): 197-200    DOI:
Original Articles |
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
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LI Xiu-Ping, YAN Wei-Xian 2004 Chin. Phys. Lett. 21 197-200
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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].
Keywords: 78.47.+p      73.50.Fq      73.20.-r     
Published: 01 January 2004
PACS:  78.47.+p  
  73.50.Fq (High-field and nonlinear effects)  
  73.20.-r (Electron states at surfaces and interfaces)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I1/0197
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