Program

P.26 -- Poster, NCTP-40

Date: Monday, 27 July 2015

Time: 14h00 - 15h30

Effect of scattering from potential-barrier roughness on the linewidth of intersubband optical absorption in symmetric rectangular quantum wells: Non-local representation for scattering form factors

Huynh Ngọc Toan (1) Nguyen Thanh Tien (2)

(1) Đại học Duy Tân, K7/25 Quang Trung, Đà Nẵng, Việt Nam (2) Đại học Khoa học, Đại học Cần Thơ, đường 3/2, Cần Thơ, Việt Nam

We develop a theory for study of the effect due to scattering from barrier roughness (BR), i.e., interface roughness-induced fluctuations in the potential-barrier position on the intersubband optical absorption linewidth in actual rectangular quantum wells (RQWs). In difference from the previous theory, within the wave-function-based approach to BR scattering, we derived properly a formula for the form factors for the scattering in terms of non-local quantities (integrals) of the envelope wave functions involved in intersubband transition. We found that for flat-band symmetric RQWs, the normal subband-energy-based approach and the wave-function-based approach with the non-local representation give the equal BR form factors. However, this non-local representation must be applied for the analysis of intersubbanb absorption in bent-band and/or asymmetric RQWs.

Presenter: Toan Ngoc Huynh