Observation of photo-induced plasmon-phonon coupling in PbTe via ultrafast x-ray scattering.

Structural dynamics (Melville, N.Y.) Pub Date : 2022-03-14 eCollection Date: 2022-03-01 DOI:10.1063/4.0000133

M P Jiang, S Fahy, A Hauber, É D Murray, I Savić, C Bray, J N Clark, T Henighan, M Kozina, A M Lindenberg, P Zalden, M Chollet, J M Glownia, M C Hoffmann, T Sato, D Zhu, O Delaire, A F May, B C Sales, R Merlin, M Trigo, D A Reis

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引用次数: 3

Abstract

We report the observation of photo-induced plasmon-phonon coupled modes in the group IV-VI semiconductor PbTe using ultrafast x-ray diffuse scattering at the Linac Coherent Light Source. We measure the near-zone-center excited-state dispersion of the heavily screened longitudinal optical (LO) phonon branch as extracted from differential changes in x-ray diffuse scattering intensity following above bandgap photoexcitation. We suggest that upon photoexcitation, the LO phonon-plasmon coupled (LOPC) modes themselves become coupled to longitudinal acoustic modes that drive electron band shifts via acoustic deformation potentials and possibly to low-energy single-particle excitations within the plasma and that these couplings give rise to displacement-correlations that oscillate in time with a period given effectively by the heavily screened LOPC frequency.

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利用超快x射线散射观察PbTe中光致等离子体-声子耦合。

本文报道了利用直线相干光源下的超快x射线漫射散射，在IV-VI族半导体PbTe中观察到光诱导等离子体-声子耦合模式。我们测量了重屏蔽纵向光学(LO)声子分支的近区中心激发态色散，这些色散是从上述带隙光激发后x射线漫射散射强度的微分变化中提取的。我们认为，在光激发下，LO声子-等离子体耦合(LOPC)模式本身与纵向声学模式耦合，后者通过声学变形势驱动电子带移动，并可能与等离子体内的低能量单粒子激发耦合，这些耦合导致位移相关性随时间振荡，该周期由严格筛选的LOPC频率有效给定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Structural dynamics (Melville, N.Y.)

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