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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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| Cite this article: |
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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].
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| Keywords:
78.47.+p
73.50.Fq
73.20.-r
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Published: 01 January 2004
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