Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-05-29
J. Phys.: Conden. Matter, Vol.13, 5103-5113 (2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 7 postscript figures
Scientific paper
10.1088/0953-8984/13/22/307
Within the one-dimensional tight-binding minibands and on-site Coloumbic interaction approximation, the absorption spectrum and coherent wavepacket time evolution in an optically excited semiconductor superlattice driven by dc-ac electric fields are investigated using the semiconductor Bloch equations. The dominating roles of the ratios of dc-Stark to external ac frequency, as well as ac-Stark to external ac frequency, is emphasized. If the former is an integer ${\cal N}$, then also ${\cal N}$ harmonics are present within one Stark frequency, while the fractional case leads to the formation of excitonic fractional ladders. The later ratio determines the size and profile of the wavepacket. In the absence of excitonic interaction it controls the maximum size wavepackets reach within one cycle, while the interaction produces a strong anisotropy and tends to palliate the dynamic wavepacket localization.
Claro Francisco
Liang Jing-Qiu
Yan Wanfeng
Zeng Zhao Yang
No associations
LandOfFree
Absorption and wavepackets in optically excited semiconductor superlattices driven by dc-ac fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Absorption and wavepackets in optically excited semiconductor superlattices driven by dc-ac fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Absorption and wavepackets in optically excited semiconductor superlattices driven by dc-ac fields will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-197093