Light-control of materials via nonlinear phononics

IF 1.3 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
A. Subedi
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引用次数: 6

Abstract

Nonlinear phononics is the phenomenon in which a coherent dynamics in a material along a set of phonons is launched after its infrared-active phonons are selectively excited using external light pulses. The microscopic mechanism underlying this phenomenon is the nonlinear coupling of the pumped infrared-active mode to other phonon modes present in a material. Nonlinear phonon couplings can cause finite time-averaged atomic displacements with or without broken crystal symmetries depending on the order, magnitude and sign of the nonlinearities. Such coherent lattice displacements along phonon coordinates can be used to control the physical properties of materials and even induce transient phases with lower symmetries. Light-control of materials via nonlinear phononics has become a practical reality due to the availability of intense mid-infrared lasers that can drive large-amplitude oscillations of the infrared-active phonons of materials. Mid-infrared pump induced insulator-metal transitions and spin and orbital order melting have been observed in pump-probe experiments. First principles based microscopic theory of nonlinear phononics has been developed, and it has been used to better understand how the lattice evolves after a mid-infrared pump excitation of infrared-active phonons. This theory has been used to predict light-induced switching of ferroelectric polarization as well as ferroelectricity in paraelectrics and ferromagnetism in antiferromagnets, which have been partially confirmed in recent experiments. This review summarizes the experimental and theoretical developments within this emerging field.
材料的非线性声子光控制
非线性声子是一种现象,在使用外部光脉冲选择性地激发材料的红外活性声子后,沿着一组声子的材料中的相干动力学被启动。这种现象背后的微观机制是泵浦的红外活性模式与材料中存在的其他声子模式的非线性耦合。非线性声子耦合可以引起有限的时间平均原子位移,无论是否具有破坏的晶体对称性,这取决于非线性的阶数、大小和符号。这种沿着声子坐标的相干晶格位移可以用于控制材料的物理性质,甚至可以诱导具有较低对称性的瞬态相。由于强中红外激光器的可用性,通过非线性声子对材料的光控制已成为现实,该激光器可以驱动材料的红外有源声子的大振幅振荡。在泵浦探针实验中观察到了中红外泵浦诱导的绝缘体-金属跃迁以及自旋和轨道有序熔化。基于第一性原理的非线性声子微观理论已经发展起来,并被用来更好地理解在红外有源声子的中红外泵浦激发后晶格是如何演化的。这一理论已被用于预测铁电极化的光致开关,以及顺电体中的铁电性和反铁磁体中的铁磁性,这在最近的实验中得到了部分证实。这篇综述总结了这一新兴领域的实验和理论发展。
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
Comptes Rendus Physique
Comptes Rendus Physique 物理-天文与天体物理
CiteScore
2.80
自引率
0.00%
发文量
13
审稿时长
17.2 weeks
期刊介绍: The Comptes Rendus - Physique are an open acess and peer-reviewed electronic scientific journal publishing original research article. It is one of seven journals published by the Académie des sciences. Its objective is to enable researchers to quickly share their work with the international scientific community. The Comptes Rendus - Physique also publish journal articles, thematic issues and articles on the history of the Académie des sciences and its current scientific activity. From 2020 onwards, the journal''s policy is based on a diamond open access model: no fees are charged to authors to publish or to readers to access articles. Thus, articles are accessible immediately, free of charge and permanently after publication. The Comptes Rendus - Physique (8 issues per year) cover all fields of physics and astrophysics and propose dossiers. Thanks to this formula, readers of physics and astrophysics will find, in each issue, the presentation of a subject in particularly rapid development. The authors are chosen from among the most active researchers in the field and each file is coordinated by a guest editor, ensuring that the most recent and significant results are taken into account. In order to preserve the historical purpose of the Comptes Rendus, these issues also leave room for the usual notes and clarifications. The articles are written mainly in English.
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