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arXiv 2501.04840cond-mat.mtrl-scicond-mat.str-el
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利用共振非弹性X射线散射直接测量六方氮化硼(hBN)中纵向激子的色散关系

Direct measurement of the longitudinal exciton dispersion in hBN by resonant inelastic x-ray scattering

Alessandro Nicolaou, Kari Ruotsalainen, Laura Susana, Victor Porée, Luiz Galvao Tizei, Jaakko Koskelo, Takashi Taniguchi, Kenji Watanabe, Alberto Zobelli, Matteo Gatti

AI总结:

本研究结合共振非弹性X射线散射、电子能量损失谱与从头算计算,识别出六方氮化硼的最低纵向激子并测定其不同方向的色散,验证了两种谱学结合研究材料电子激发的潜力。

摘要:

我们报道了对典型层状化合物六方氮化硼hBN开展的共振非弹性X射线散射(RIXS)测量研究。研究将B K边和N K边的RIXS结果,与电子能量损失谱(EELS)实验、多体微扰理论框架下基于Bethe-Salpeter方程的从头算计算相结合。通过不同谱学技术的紧密配合,研究识别出了hBN的最低能量纵向激子,还测定了其沿布里渊区ΓK与ΓM方向性质存在差异的色散关系。本研究表明,软X射线RIXS与EELS的结合是研究材料电子激发的一种很有前景的方法。

英文摘要:

We report resonant inelastic X-ray scattering (RIXS) measurements on the prototypical hexagonal boron nitride hBN layered compound. The RIXS results at the B and N K edges have been combined with electron energy loss spectroscopy (EELS) experiments and ab initio calculations within the framework of the Bethe-Salpeter equation of many-body perturbation theory. By means of this tight interplay of different spectroscopies, the lowest longitudinal exciton of hBN has been identified. Moreover, its qualitatively different dispersions along the $Γ$K and the $Γ$M directions of the Brillouin zone have been determined. Our study advocates soft X-ray RIXS and EELS to be a promising combination to investigate electronic excitations in 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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