Gerber S, Kim K W, Zhang Y, Zhu D, Plonka N, Yi M, Dakovski G L, Leuenberger D, Kirchmann P S, Moore R G, Chollet M, Glownia J M, Feng Y, Lee J-S, Mehta A, Kemper A F, Wolf T, Chuang Y-D, Hussain Z, Kao C-C, Moritz B, Shen Z-X, Devereaux T P, Lee W-S
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Department of Physics, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju 361-763, Korea.
Nat Commun. 2015 Jun 8;6:7377. doi: 10.1038/ncomms8377.
Ultrafast light pulses can modify electronic properties of quantum materials by perturbing the underlying, intertwined degrees of freedom. In particular, iron-based superconductors exhibit a strong coupling among electronic nematic fluctuations, spins and the lattice, serving as a playground for ultrafast manipulation. Here we use time-resolved X-ray scattering to measure the lattice dynamics of photoexcited BaFe2As2. On optical excitation, no signature of an ultrafast change of the crystal symmetry is observed, but the lattice oscillates rapidly in time due to the coherent excitation of an A1g mode that modulates the Fe-As-Fe bond angle. We directly quantify the coherent lattice dynamics and show that even a small photoinduced lattice distortion can induce notable changes in the electronic and magnetic properties. Our analysis implies that transient structural modification can be an effective tool for manipulating the electronic properties of multi-orbital systems, where electronic instabilities are sensitive to the orbital character of bands.
超快光脉冲可以通过扰动潜在的、相互交织的自由度来改变量子材料的电子特性。特别是，铁基超导体在电子向列涨落、自旋和晶格之间表现出强耦合，是超快操纵的一个研究平台。在这里，我们使用时间分辨X射线散射来测量光激发的BaFe2As2的晶格动力学。在光激发时，未观察到晶体对称性超快变化的迹象，但由于调制Fe-As-Fe键角的A1g模式的相干激发，晶格随时间快速振荡。我们直接量化了相干晶格动力学，并表明即使是小的光致晶格畸变也能引起电子和磁性质的显著变化。我们的分析表明，瞬态结构修饰可以成为操纵多轨道系统电子特性的有效工具，在多轨道系统中，电子不稳定性对能带的轨道特性很敏感。
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