Programme

P.13 -- Poster, NCTP-39

Date: Tuesday, 29-07-2014

Time: 10h30 - 12h00

Quantum confinement in a parabolic quantum well based on polar materials

Pham Thi Bich Thao (1), Nguyen Duy Khanh (1), Nguyen Thanh Tien (1), Doan Nhat Quang (2)

(1) Department of Physics, College of Natural Science, Can Tho University (2) Institute of Physics, Vietnamese Academy of Science and Technology

Spontaneous and piezoelectric polarization are known to be the key effect on the electronic and optical properties of polar heterostructures. This effect modifies the electronic states in the quantum well. We presented a variational approach to the quantum confinement due to polar charges at the interface of the AlGaN-GaN parabolic single quantum well by varying the Al content in the well region. Electrons diffuse into the well and confine within an asymmetric potential profile. We analyze interaction of the parabolic potential and the polarization effect triangular like potential due to varying the Al content in barrier. We calculate the energy levels and wave functions of the bound states. There are significantly different the energy levels and wave functions of parabolic quantum wells with that of the square quantum well by varying the structural parameters: the alloy content and the well width. This results as the basis for next calculations related to transport and optical properties of the parabolic quantum wells based on polar materials.

Presenter: Pham Thi Bich Thao