Probing ferroelectricity by x-ray absorption spectroscopy in molecular crystals

Probing ferroelectricity by x-ray absorption spectroscopy in molecular crystals
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通过 X 射线吸收光谱探测分子晶体中的铁电性

DOI:
10.1103/physrevmaterials.4.034401
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发表时间:
2020
影响因子:
3.4
通讯作者:
Xu, Xiaoshan
Xu, Xiaoshan
中科院分区:
材料科学3区
文献类型:
--
作者:
Tang, Fujie;Jiang, Xuanyuan;Ko, Hsin-Yu;Xu, Jianhang;Topsakal, Mehmet;Hao, Guanhua;N'Diaye, Alpha T.;Dowben, Peter A.;Lu, Deyu;Xu, Xiaoshan

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以质子转移产生电极化的铁电有机分子固体为原型,在克糖酸()晶体的氧边进行了x射线吸收光谱实验。由从头算分子动力学模拟得到的电子-空穴激发理论模拟很好地再现了实验光谱。当铁电态的反转对称性被破坏时,两个键合分子上的氢键环境变得不等效。这种差异是灵敏地探测前边缘,这是强烈本地化的激发分子的束缚激发。我们的分析表明,在前边缘的卫星峰将出现在较高的激发能量,这是一个明确的标志,铁电性的材料。
We carry out x-ray absorption spectroscopy experiment at the oxygenedge in croconic acid () crystal as a prototype of ferroelectric organic molecular solid, whose electric polarization is generated by proton transfer. The experimental spectrum is well reproduced by the electron-hole excitation theory simulations from configuration generated byab initiomolecular dynamics simulation. When inversion symmetry is broken in the ferroelectric state, the hydrogen bonding environment on the two bonded molecules become inequivalent. Such a difference is sensitively probed by the bound excitation in the pre-edge, which is strongly localized on the excited molecules. Our analysis shows that a satellite peak in the pre-edge will emerge at higher excitation energy, which serves as a clear signature of ferroelectricity in the material.
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