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Molecular beam epitaxy, photoluminescence from Mn2+ multiplets and self-trapped exciton states of γ-MnTe single-crystalline thin films by Hechun Cao; Jiyue Zhang; Wei Bai; Dongyang Zhao; Ruobing Lin; Xudong Wang; Jing Yang; Yuanyuan Zhang; Ruijuan Qi; Rong Huang; Xiaodong Tang; Jianlu Wang; Junhao Chu is a Materials Science article available to read on EtoBox.

What is Molecular beam epitaxy, photoluminescence from Mn2+ multiplets and self-trapped exciton states of γ-MnTe single-crystalline thin films about?

Single-crystalline γ-MnTe thin films with zinc-blende structure were grown epitaxially on InP(111) by molecular beam epitaxy. Two-dimensional growth regime and atomic surface flatness are achieved, and appearance of Laue’s oscillation peaks illustrates the superior crystalline quality and interface of γ-MnTe films. A pseudocrystalbuffer layer is formed at interface releasing the strain led by the large lattice mismatch between γ-MnTe and InP, and then growth of γ-MnTe films with a perfect lattice evidences the high-quality crystallinity in a fully relaxed state. Photoluminescence (PL) emissions from 4 T 1g(4 G) and 4 T 1(4 G) related to Mn2+ ions d-d multiplets are observed with their respective activation energies of ∼142.5 meV and ∼323.5 meV. Such high potentials reflecting the nonradiative recombination indicate the thermal stability of these PL. Moreover, two extra PL transitions assigned to be the emissions from self-trapped exciton (STE) states are found below T N. Time-resolved PL (TRPL) spectra at various temperatures indicate that the relaxation dynamics of photoexcited d-electrons is strongly correlated to the antiferromagnetic ordering transition due to the synergy of ma

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Author

Hechun Cao; Jiyue Zhang; Wei Bai; Dongyang Zhao; Ruobing Lin; Xudong Wang; Jing Yang; Yuanyuan Zhang; Ruijuan Qi; Rong Huang; Xiaodong Tang; Jianlu Wang; Junhao Chu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)