Dispersion relations of interface and quasi-confined phonon modes in ZnO/BeZnO quantum wells

Küçük Resim Yok

Tarih

2021

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Elsevier

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

The long-wave optical phonon frequencies of BexZn1-xO alloys are determined within the modified random-element isodisplacement model. The results indicate a two-mode behavior for A(1) and E-1 branches of the optical phonons. The dispersions of the interface and quasi-confined modes in the polar ZnO/BexZn1-xO quantum wells are calculated within the dielectric continuum model up to x = 0.2. In the absence of strain, the quantum wells yield as many as three distinct frequency ranges for the IF modes. However, the quasi-confined modes have two separate frequency ranges with boundaries determined by the ZnO-like and ZnO phonons. With the inclusion of strain, the boundaries of the frequency ranges for each mode are modified but without any change in the overall picture. (C) 2020 Elsevier B.V. All rights reserved.

Açıklama

Anahtar Kelimeler

ZnO, BeZnO, Phonons, Quantum wells

Kaynak

Physics Letters A

WoS Q Değeri

Q2

Scopus Q Değeri

Q2

Cilt

385

Sayı

Künye