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Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering

机译：用X射线扩散散射成像非平衡原子振动

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摘要

We use picosecond x-ray diffuse scattering to image the nonequilibrium vibrations in the lattice following ultrafast laser excitation. We present images of nonequilibrium phonons in InP and InSb throughout the Brillouin zone which remain out of equilibrium up to nanoseconds. The results are analyzed using a Born model that helps identify the phonon branches contributing to the observed features in the time-resolved diffuse scattering. In InP this analysis shows a delayed increase in the transverse-acoustic (TA) phonon population along high-symmetry directions accompanied by a decrease in the longitudinal-acoustic phonons. In InSb the increase in TA phonon population is less directional.
机译：我们使用皮秒x射线漫散射来成像超快激光激发后晶格中的非平衡振动。我们展示了整个布里渊区中InP和InSb中非平衡声子的图像，这些非平衡声子在高达纳秒的时间内仍处于失衡状态。使用Born模型分析结果，该模型有助于识别声子分支，这些声子分支在时间分辨的散射中有助于观察到的特征。在InP中，此分析显示，沿高对称方向的横向声（TA）声子总数增加延迟，而纵向声子的声子减小。在InSb中，TA声子数量的增加是较少定向的。

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  • 来源
    《Physical review》 |2010年第23期|p.366-370|共5页
  • 作者

    M. Trigo; J. Chen; V. H. Vishwanath; Y. M. Shell; T. Graber; R. Henning; D. A. Reis;

  • 作者单位

    PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

    FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA;

    The Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA;

    The Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA;

    PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA and Department of Photon Science and Applied Physics, Stanford University, Stanford, California 94305, USA;

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