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 [129.11.176.30])
<> 	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: <5345.9709231144@sun.leeds.ac.uk>
<> Subject: Meeting / Educato-etal
<> To: een6rwk@sun.leeds.ac.uk (R W Kelsall)
<> Date: Tue, 23 Sep 1997 12:44:32 +0100 (BST)
<> Cc: eenpk (P Kinsler)
<> In-Reply-To: <4901.9709231051@sun.leeds.ac.uk> from "R W Kelsall" at Sep 23, 97 11:51:30 am
<> X-Mailer: ELM [version 2.4 PL24]
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<> 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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