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arXiv 2602.18259cond-mat.mtrl-sci
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立方氮化硼中光吸收与发射的声子辅助效应

Phonon assisted light absorption and emission in cubic-Boron Nitride

Aix-Marseille Univ.(艾克斯-马赛大学);CNRS(法国国家科学研究中心);Centro S3, CNR-Istituto Nanoscienze(CNR纳米科学研究所S3中心)

Ashwin Pillai, Elena Cannuccia, Aurelien Manchon, Fulvio Paleari, Claudio Attaccalite

AI总结:

研究通过第一性原理方法探讨立方氮化硼的光学性质,揭示声子辅助过程对吸收和发光谱的主要贡献,解释理论光隙与实验发光的差异。

摘要:

立方氮化硼(cBN)是一种宽禁带的硼氮多形体,其光学响应仍部分未被理解,原因是间接电子跃迁与强激子-声子耦合共存。通过第一性原理的多体微扰理论,我们结合GW准粒子修正与贝叶斯-萨尔佩特方程计算激子效应,研究cBN的光学性质。通过激子-声子耦合形式明确包含声子辅助的吸收和发射过程。我们发现,声子介导的光学跃迁对吸收和发光谱提供了主要贡献,部分解释了理论光学间隙(≈11 eV)与实验发射(约6-7 eV)之间的差异。我们的结果表明,包括激子-声子相互作用对于正确解释实验光谱至关重要,为宽禁带材料的发光提供了新的见解。

英文摘要:

Cubic boron nitride (cBN) is a wide-bandgap polymorph of boron nitride whose optical response remains only partially understood due to the coexistence of indirect electronic transitions and strong exciton-phonon coupling. Using first-principles many-body perturbation theory, we investigate the optical properties of cBN by combining GW quasiparticle corrections with Bethe-Salpeter equation calculations of excitonic effects. Phonon-assisted absorption and emission processes are explicitly included through the exciton-phonon coupling formalism. We find that phonon-mediated optical transitions provide a dominant contribution to both absorption and luminescence spectra, partially reconciling the discrepancy between the theoretical optical gap ($\simeq$ 11 eV) and experimental emission around 6-7 eV. Our results demonstrate the importance of including exciton-phonon interactions for the correct interpretation of experimental spectra, offering new insights into light emission in wide-bandgap materials.

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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