Dielectric confinement effect

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What is Dielectric confinement effect?. or could you advise me literature about this?

Thank you.
 
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dielectric constant (ε) of semiconductor can be changed by deposition on high (or low) ε substrate.
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Dielectric confinement is effective reduction of the dielectric constant due to the penetration of electric field into barrier medium with a small dielectric constant.

for further inf.
original paper:
Keldysh, L.V.: Pis’ma Zh. Eksp. Teor. Fiz. 29, 716 (1979). JETPLett. 29, 658, 1979

and very nice prezentation:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCUQFjAAahUKEwiklsTR54jIAhWp73IKHeINDEI&url=http://collaborations.fz-juelich.de/ikp/cgswhp/cgswhp12/program/files_batumi/16-08-2012/Parallel_Session_7/2_Tamar.Tchelidze.ppt&usg=AFQjCNHBi1gwjjvLkzp4TuMIJN5PGTRu1A&sig2=u-8V63Irbv-KskTh-nPLlw
 

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