Dr Paul Kinsler. [Acknowledgements & Feedback]
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<> <> From eenpk Tue Sep 23 12:44 BST 1997 <> Received: from sun.leeds.ac.uk (eenpk@eenserv1 [220.127.116.11]) <> by sun.leeds.ac.uk (8.8.5/8.8.5) with SMTP id MAA20980; <> Tue, 23 Sep 1997 12:44:32 +0100 (BST) <> From: P Kinsler
<> Message-Id: <email@example.com> <> Subject: Meeting / Educato-etal <> To: firstname.lastname@example.org (R W Kelsall) <> Date: Tue, 23 Sep 1997 12:44:32 +0100 (BST) <> Cc: eenpk (P Kinsler) <> In-Reply-To: <email@example.com> from "R W Kelsall" at Sep 23, 97 11:51:30 am <> X-Mailer: ELM [version 2.4 PL24] <> Content-Type: text <> Content-Length: 1872 <> Status: RO <> <> > Paul Harrison is back in the dept. I suggest we 3 meet up later <> > this week to review progress - how about tomorrow (Wed) at 10am. <> <> OK. <> <> > After that, term starts & I would like to fix a regular time for <> > us to meet weekly. Based on my present timetable I suggest Tues afternoons. <> <> Sounds fine. <> <> > NB. Do you have a copy of Educato, Leburton et al Phys Rev B v47 <> > [...] <> > This is correct within the assumptions of the DCM - but would Ridley's <> > model lead to the same treatment?... <> <> Ridley has that in AlAs the LO dispersion is too weak to get LO-IP <> hybridisation "except over a narrow range of frequencies". Ignoring <> the 'except', this means there are IP-like modes independent of the <> hybridon modes. In GaAs there are no independent IP-like modes, all <> are mixed together to form hybridons. <> <> Educato-Leberton et al have a GaAs - AlGaAs structure, so assuming the <> Ridley rigid boundary conditions are OK (which is very arguable), then <> there might be some IP-like modes from due to the 14% Al component in the <> well -- but I'd guess that unless the Al fraction was really high, then <> the AlGaAs would have phonons closer to GaAs than AlAs. <> <> The critical decider seems to be the LO dispersion, I dont know (without <> looking it up) how the Al fraction affects this in AlGaAs, but given that <> GaAs has the stronger phonon dispersion and a linear fit, that 14% Al <> is phonon-wise pretty much the same as GaAs. <> <> So it seems Educato-Leberton et al shouldn't have included IP phonons, <> unless there's a reason based on the boundary conditions. <> <> -----------------------------+----------------------------- <> Dr. Paul Kinsler <> Department of E&E Engineering (ph) +44-113-2332089 <> University of Leeds (fax)+44-113-2332032 <> Leeds LS2 9JT IRC: haberman (on #physics) <> United Kingdom P.Kinsler@elec-eng.leeds.ac.uk <>
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