Light control of the nanoscale phase separation in heteroepitaxial nickelates

Light control of the nanoscale phase separation in heteroepitaxial nickelates
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异质外延镍酸盐纳米级相分离的光控制

DOI:
10.1103/physrevmaterials.2.085002
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发表时间:
2018
影响因子:
3.4
通讯作者:
Mattoni G
Mattoni G
中科院分区:
材料科学3区
文献类型:
--
作者:
Mattoni G

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强关联材料表现出独特的固态相变,具有丰富的纳米级现象,可以通过外部刺激来控制。特别有趣的是在异质外延镍酸盐的金属-绝缘体过渡附近的光-物质相互作用的情况下。在这项工作中,我们使用近红外激光在高强度激发制度操纵纳米级相分离。通过调节激光强度,我们可以重复设置绝缘纳米畴的覆盖范围,我们通过光电子发射电子显微镜成像,从而半永久地配置材料状态。借助传输测量和有限元模拟,我们确定了两个不同的时间尺度的光-物质相互作用的热动力学:稳态和快速瞬态局部加热。这些结果打开了有趣的观点,局部操纵和重新配置电子秩序在纳米尺度上的光学手段。
Strongly correlated materials show unique solid-state phase transitions with rich nanoscale phenomenology that can be controlled by external stimuli. Particularly interesting is the case of light–matter interaction in the proximity of the metal–insulator transition of heteroepitaxial nickelates. In this work, we use near-infrared laser light in the high-intensity excitation regime to manipulate the nanoscale phase separation in. By tuning the laser intensity, we can reproducibly set the coverage of insulating nanodomains, which we image by photoemission electron microscopy, thus semipermanently configuring the material state. With the aid of transport measurements and finite element simulations, we identify two different timescales of thermal dynamics in the light–matter interaction: a steady-state and a fast transient local heating. These results open interesting perspectives for locally manipulating and reconfiguring electronic order at the nanoscale by optical means.
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