arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.04865cond-mat.mtrl-sci
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电荷极化对蓝光超晶格光学响应的影响

Charge polarization effects on the optical response of blue-emitting superlattices

Pedro Pereyra, Fatna Assaoui

摘要:

在研究周期性结构光学响应的新方法中,自发电荷极化被忽略了,该方法已成功地应用于研究蓝色发光InGaN/GAN超晶格的光学性质。为了研究这种量子限制斯塔克现象的影响,我们研究了光学响应,假设在导带和价带的抛物线带边调制。我们讨论的后果上的本征函数的对称性和随之而来的光学跃迁选择规则。利用有限周期系统理论的WKB近似的新方法,我们确定了导带和价带的能量本征值及其相应的本征函数和子带结构。计算了光致发光随电荷局域化强度的变化,并与实验结果进行了比较。我们发现,对于靠近势垒边缘的子带,光学响应和表面态对电荷极化强度敏感。

英文摘要:

In the new approach to study the optical response of periodic structures, successfully applied to study the optical properties of blue-emitting InGaN/GaN superlattices, the spontaneous charge polarization was neglected. To search the effect of this quantum confined Stark phenomenon we study the optical response, assuming parabolic band edge modulations in the conduction and valence bands. We discuss the consequences on the eigenfunction symmetries and the ensuing optical transition selection rules. Using the new approach in the WKB approximation of the finite periodic systems theory, we determine the energy eigenvalues, their corresponding eigenfunctions and the subband structures in the conduction and valence bands. We calculate the photoluminescence as a function of the charge localization strength, and compare with the experimental result. We show that for subbands close to the barrier edge the optical response and the surface states are sensitive to charge polarization strength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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