Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1016/j.physe.2020.114205
Ключевые слова: band gap engineering, cri3, dft, ferromagnetism, nanotubes, strain effect
Аннотация: In this paper, structural and electronic properties of CrI3 magnetic nanotubes (NTs) are studied using density functional theory. Both armchair and zigzag CrI3 nanotubes demonstrate a high correlation in strain energy between each other independently on accounting the Hubbard correction. The strain energies decrease with expansion Показать полностьюof the tube diameter making the tubes’ synthesis with a diameter larger than 45 Å to be energetically possible. The nanotubes of both zigzag and armchair chirality are ferromagnetic semiconductors with band gaps close to that of the CrI3 monolayer. The band gaps are suppressed by reducing the tube diameters due to the structural stress leading to deformation of the Cr–I crystal field and changes in the bond lengths. The external strain can be utilized to flexibly tune the electronic properties of CrI3 nanotubes with the desired spin-up/spin-down band gap ratio. Strong distortion of the octahedral Cr–I crystal field under compression results in nontrivial behavior in the spin-up band gap of (4, 4) tube. Stretching of tubes leads to the enhancement of the exchange energy that should result in higher Curie temperature, therefore providing a good platform for potential applications in spintronic nanodevices. © 2020 Elsevier B.V.
Журнал: Physica E: Low-Dimensional Systems and Nanostructures
Выпуск журнала: Vol. 123
ISSN журнала: 13869477
Издатель: Elsevier B.V.114205