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

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL Structural Dynamics-Us 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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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.