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Strain gradient induced spatially indirect excitons in single crystalline ZnO nanowires.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0nr03563g Zhao Liu 1 , Xuewen Fu 2 , Dong-Bo Zhang 3
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0nr03563g Zhao Liu 1 , Xuewen Fu 2 , Dong-Bo Zhang 3
Affiliation
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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.
中文翻译：
应变梯度在单晶ZnO纳米线中诱导空间间接激子。
空间间接激子不仅对引起人们兴趣的多体效应很重要，而且对开发高效太阳能电池等应用也很重要。这种激子通常存在于异质结构中。使用广义布洛赫定理与密度泛函紧密结合方法，我们揭示了在弯曲下单晶ZnO纳米线中可能出现空间间接激子。潜在的机理归因于由于弯曲的纳米线的应变梯度而形成的有效的II型能带排列。我们的发现为通过应变工程实现空间间接激子开辟了一条新途径。
更新日期：2020-10-02
中文翻译：
应变梯度在单晶ZnO纳米线中诱导空间间接激子。
空间间接激子不仅对引起人们兴趣的多体效应很重要，而且对开发高效太阳能电池等应用也很重要。这种激子通常存在于异质结构中。使用广义布洛赫定理与密度泛函紧密结合方法，我们揭示了在弯曲下单晶ZnO纳米线中可能出现空间间接激子。潜在的机理归因于由于弯曲的纳米线的应变梯度而形成的有效的II型能带排列。我们的发现为通过应变工程实现空间间接激子开辟了一条新途径。
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