Kudryavtsev Oleg S, Bagramov Rustem H, Satanin Arkady M, Shiryaev Andrey A, Lebedev Oleg I, Romshin Alexey M, Pasternak Dmitrii G, Nikolaev Alexander V, Filonenko Vladimir P, Vlasov Igor I
Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia.
Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences, 108840 Moscow, Troitsk, Russia.
Nano Lett. 2022 Apr 13;22(7):2589-2594. doi: 10.1021/acs.nanolett.1c04887. Epub 2022 Mar 18.
Two novel properties, unique for semiconductors, a negative electron affinity and a high p-type surface electrical conductivity, were discovered in diamond at the end of the last century. Both properties appear when the diamond surface is hydrogenated. A natural question arises: is the influence of the surface hydrogen on diamond limited only to the electrical properties? Here, for the first time to our knowledge, we observe a transparency peak at 1328 cm in the infrared absorption of hydrogen-terminated pure (undoped) nanodiamonds. This new optical property is ascribed to Fano-type destructive interference between zone-center optical phonons and free carriers (holes) appearing in the near-surface layer of hydrogenated nanodiamond. This work opens the way to explore the physics of electron-phonon coupling in undoped semiconductors and promises the application of H-terminated nanodiamonds as a new optical material with induced transparency in the infrared optical range.
上世纪末，在金刚石中发现了半导体特有的两种新特性：负电子亲和势和高p型表面电导率。当金刚石表面氢化时，这两种特性都会出现。一个自然而然的问题出现了：表面氢对金刚石的影响是否仅限于电学性质？据我们所知，在此我们首次在氢化纯（未掺杂）纳米金刚石的红外吸收中观察到在1328厘米处有一个透明度峰值。这种新的光学特性归因于氢化纳米金刚石近表面层中出现的区中心光学声子与自由载流子（空穴）之间的法诺型相消干涉。这项工作为探索未掺杂半导体中的电子 - 声子耦合物理开辟了道路，并有望将氢化纳米金刚石作为一种在红外光学范围内具有诱导透明度的新型光学材料加以应用。
