Nonperturbative determination of isotope-induced anomalous vibrational physics
Nonperturbative determination of isotope-induced anomalous vibrational physics
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同位素引起的异常振动物理的非微扰测定
DOI:
10.1103/physrevb.108.l140302
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发表时间:
2023
影响因子:
3.7
通讯作者:
Hu, Yongjie
中科院分区:
文献类型:
--
作者:
Wu, Huan;Qin, Zihao;Li, Suixuan;Lindsay, Lucas;Hu, Yongjie
In general, vibrational physics has been well described by quantum perturbation theory (QPT) to provide footprint characteristics for common crystals. However, despite weak phonon anharmonicity, the recently discovered cubic crystals (BAs and BP) have shown anomalous vibrational dynamics with elusive fundamental origin. Here, we developed a nonperturbativeab initioapproach, together with spectroscopy and high-pressure experiments, to successfully determine the exact dynamic evolutions of the vibrational physics. We found that the local fluctuation and coupling isotopes significantly dictate the vibrational spectra, through the Brillouin zone folding that has previously been ignored in literature. By decomposing vibrational spectra into individual isotope eigenvectors, we observed both positive and negative contributions to Raman intensity from constitutional atoms (, or). Importantly, our nonperturbative theory predicts that a vibrational resonance appears at high hydrostatic pressure due to broken translational symmetry, which was indeed verified by experimental measurement under a pressure up to 31.5 GPa. In this paper, we develop fundamental understandings for the anomalous lattice physics under the failure of QPT and provide an approach in exploring transport phenomena for materials of extreme properties.
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