Issue 37, 2020
From the journal:

Nanoscale

Strain gradient induced spatially indirect excitons in single crystalline ZnO nanowires†

Zhao Liu, ORCID logo a   Xuewen Fub  and  Dong-Bo Zhang*ca  

* Corresponding authors

a Beijing Computational Science Research Center, Beijing 100193, China
E-mail: dbzhang@bnu.edu.cn

b School of Physics, Nankai University, Tianjin 300071, China

c College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Abstract

Spatially indirect excitons are important not only for the exploration of intriguing many-body effects but also for the development of applications such as solar cells with high efficiency. This type of exciton usually exists in heterostructures. Using the generalized Bloch theorem coupled with the density-functional tight-binding method, we reveal that spatially indirect excitons may emerge in single crystalline ZnO nanowires under bending. The underlying mechanism is attributed to the formation of an effective type-II band alignment due to the strain-gradient of the bent nanowires. Our finding paves a new route to realize spatially indirect excitons by strain engineering.

Graphical abstract: Strain gradient induced spatially indirect excitons in single crystalline ZnO nanowires

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Article information

DOI
https://doi.org/10.1039/D0NR03563G
Article type
Communication
Submitted
07 May 2020
Accepted
27 Aug 2020
First published
28 Aug 2020

Nanoscale, 2020,12, 19083-19087

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Strain gradient induced spatially indirect excitons in single crystalline ZnO nanowires

Z. Liu, X. Fu and D. Zhang, Nanoscale, 2020, 12, 19083 DOI: 10.1039/D0NR03563G

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