Dispersion relations of interface and quasi-confined phonon modes in ZnO/BeZnO quantum wells
Küçük Resim Yok
Tarih
2021
Yazarlar
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
