Infrared plasmons in ultrahigh conductive PdCoO2 metallic oxide
Infrared plasmons in ultrahigh conductive PdCoO2 metallic oxide
复制标题
超高导电 PdCoO2 金属氧化物中的红外等离子体激元
DOI：
10.1038/s42005-022-00924-0
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发表时间：
2022
影响因子：
5.5
通讯作者：
Lupi, Stefano
中科院分区：
文献类型：
--
作者：
Macis, Salvatore;Tomarchio, Luca;Tofani, Silvia;Piccirilli, Federica;Zacchigna, Michele;Aglieri, Vincenzo;Toma, Andrea;Rimal, Gaurab;Oh, Seongshik;Lupi, Stefano
PdCoO2层状铜铁矿是金属氧化物中导电性最好的化合物，室温电阻率接近，对应的平均自由程约为600 Ω。这些值代表考虑到PdCoO2的电荷密度比铜低三倍的记录。虽然其显着的电子输运特性，PdCoO2集体电荷密度模式（即表面等离子体）从来没有被调查，至少据我们所知。在本文中，我们研究了高品质的PdCoO2薄膜的表面等离子体，图案化的微带状阵列的形式。通过改变其宽度W和周期2W，选择合适的等离子体波矢量q值，实验取样了中红外电磁区的表面等离子体色散。在带边缘附近，我们观察到由于等离激元限制的强场增强，表明PdCoO2作为一种有前途的红外等离激元材料。
PdCoO2layered delafossite is the most conductive compound among metallic oxides, with a room-temperature resistivity of nearly, corresponding to a mean free path of about 600 Å. These values represent a record considering that the charge density of PdCoO2is three times lower than copper. Although its notable electronic transport properties, PdCoO2collective charge density modes (i.e. surface plasmons) have never been investigated, at least to our knowledge. In this paper, we study surface plasmons in high-quality PdCoO2thin films, patterned in the form of micro-ribbon arrays. By changing their widthWand period 2W, we select suitable values of the plasmon wavevectorq, experimentally sampling the surface plasmon dispersion in the mid-infrared electromagnetic region. Near the ribbon edge, we observe a strong field enhancement due to the plasmon confinement, indicating PdCoO2as a promising infrared plasmonic material.