NDLI: Thirty-band k · p model for Si-based optoelectronics

Content Provider	IEEE Xplore Digital Library
Author	Szczap, M. Cavassilas, N. Michelini, F.
Copyright Year	2010
Description	Author affiliation: IM2NP, Aix-Marseille Université, F-13384 Marseille Cedex 13, France (Cavassilas, N.; Michelini, F.) \|\| STMicroelectronics, F-38926 Crolles Cedex, France (Szczap, M.)
Abstract	We use a 30-band k · p model to investigate interval-ley splittings and optical transitions inside the fine structure of conduction subbands in [001] Si quantum wells. Ground and first excited doublets generated in the wells exhibit decaying oscillations as a function of well width with same periodicity and opposite phase. A uniform electric field superimposed along the well axis produces a damping of oscillation amplitudes while period and phase remain unchanged. These oscillations depend on the location of the bulk conduction band minima along the X-directions, and hence are indirect gap signatures. Within the k · p framework, we analyse the thirty Bloch components and parity of the doublet wave functions. Such a study allows us to develop an analytical approach, using a two-band k · p model, which reproduces intervalley splittings with goog agreement. It furthermore gives the keys to elucidate intersubband optical transitions between the two doublets. Indeed, optical matrix shows clear selection rules with a uniaxial polarization along the well axis. Moreover, matrix elements also oscillate with same period and phase, above the result given by the standard effective mass approximation.
Starting Page	1
Ending Page	4
File Size	534799
Page Count	4
File Format	PDF
ISBN	9781424493838
e-ISBN	9781424493845
DOI	10.1109/IWCE.2010.5677965
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-26
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Optical polarization Oscillators Couplings Silicon germanium Effective mass Approximation methods
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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