Electric Field Effect on Quantum Well.

[riaz]

Hello everybody !

Recently i heard that, application of an electric field onto a quantum well tilts the quatum well
and changes its 2-D density of states to 3-D bulk density. Is this true..?
Can any body give some more information or reference on this..?

Thanks for any Help.

 

[Enthalpy]

Tilts the quantum well, sure. The electron's energy depends on the electric potential which the external field lets vary over the position - just as in vacuum, possibly with permittivity somewhere.

 

Change to 3D bulk density: I don't understand. As long as the electron stays trapped, there must be some effect on the state density. But tilting will affect the density of states.

 

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With reference to our other question: in case the well results from a MOS gate, if the gate potential releases the electrons, these get free to move in the bulk where the usual state density applies.

 

It's only that in the usual operation of a normal MOS transistor, the channel's carriers go to the source and gate, at least after some short time. Longer storage in the depth would happen in a CCD device.

Edited April 5, 2016 by Enthalpy