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Electron distribution in polar heterojunctions within a realistic model

We present a theoretical study of the electron distribution, i.e., two-dimensional electron gas (2DEG) in polar heterojunctions (HJs) within a realistic model. The 2DEG is confined along the growth direction by a triangular quantum well with a finite potential barrier and a bent band figured by all...

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Published in:	Physica. B, Condensed matter Condensed matter, 2015-12, Vol.479, p.62-66
Main Authors:	Tien, Nguyen Thanh, Thao, Dinh Nhu, Thao, Pham Thi Bich, Quang, Doan Nhat
Format:	Article
Language:	English
Subjects:	Condensed matter Confinement Confining Density Electron distribution Electron gas Finite potential barrier Hetero-junction Heterojunctions Interface polarization charge Modulation doping Polar semiconductor Polarization
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creator	Tien, Nguyen Thanh Thao, Dinh Nhu Thao, Pham Thi Bich Quang, Doan Nhat
description	We present a theoretical study of the electron distribution, i.e., two-dimensional electron gas (2DEG) in polar heterojunctions (HJs) within a realistic model. The 2DEG is confined along the growth direction by a triangular quantum well with a finite potential barrier and a bent band figured by all confinement sources. Therein, interface polarization charges take a double role: they induce a confining potential and, furthermore, they can make some change in other confinements, e.g., in the Hartree potential from ionized impurities and 2DEG. Confinement by positive interface polarization charges is necessary for the ground state of 2DEG existing at a high sheet density. The 2DEG bulk density is found to be increased in the barrier, so that the scattering occurring in this layer (from interface polarization charges and alloy disorder) becomes paramount in a polar modulation-doped HJ.
doi_str_mv	10.1016/j.physb.2015.09.042
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subjects	Condensed matter Confinement Confining Density Electron distribution Electron gas Finite potential barrier Hetero-junction Heterojunctions Interface polarization charge Modulation doping Polar semiconductor Polarization
title	Electron distribution in polar heterojunctions within a realistic model
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