arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1607.01653cond-mat.mtrl-sci
收藏

基于非线性声子的超快结构开关

Ultrafast Structure Switching through Nonlinear Phononics

Dominik Maximilian Juraschek, Michael Fechner, Nicola Ann Spaldin

摘要:

我们描述了一个超快相干控制所产生的非线性声子在ErFeO $_3$的瞬态结构失真。使用密度泛函理论,我们计算的结构特性作为输入到一个非谐声子模型,该模型描述了系统的脉冲光激发的响应。我们发现,三线性耦合的两个正交的红外活性声子的拉曼活性声子引起的晶格的瞬态畸变。畸变的方向由激发光的偏振决定,这表明了一种非线性声子晶格控制和开关的途径。由于耦合的发生是由系统的对称性决定的,我们认为这是正交和四方钙钛矿的普遍特征。

英文摘要:

We describe an ultrafast coherent control of the transient structural distortion arising from nonlinear phononics in ErFeO$_3$. Using density functional theory, we calculate the structural properties as input to an anharmonic phonon model that describes the response of the system to a pulsed optical excitation. We find that the trilinear coupling of two orthogonal infrared-active phonons to a Raman-active phonon causes a transient distortion of the lattice. The direction of the distortion is determined by the polarization of the exciting light, suggesting a route to nonlinear phononic lattice control and switching. Since the occurrence of the coupling is determined by the symmetry of the system we propose that it is a universal feature of orthorhombic and tetragonal perovskites.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑