| Coherent Excitonic Wavepackets in Two-Dimensional Square Dot Arrays Driven by an In-Plane Uniform Electric Field |
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| 作者姓名： | 李秀平 阎维贤 |
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| 作者单位： | DepartmentofPhysics,ShanxiUniversity,Taiyuan030006 |
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| 摘 要： | 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 coprlme integer numbers), the wavepackets undergo a time-periodic breathing mode, with the period 2πp/ωBx, where ωBx=eExα/h, with a being the lattice constant of square dot arrays, h 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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| 关 键 词： | 统一电子场 量子点 激子波包 飞秒激光技术 薛定锷方程 |
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