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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2022 Volume 115, Issue 11, Pages 692–698 (Mi jetpl6681)

This article is cited in 5 papers

OPTICS AND NUCLEAR PHYSICS

Temperature dependence of the Fano resonance in nanodiamonds synthesized at high static pressures

A. A. Shiryaevab, E. A. Ekimovc, V. Yu. Prokof'eva, M. V. Kondrinc

a Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Moscow, 119017 Russia
b Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia
c Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Moscow, 108840 Russia

Abstract: The temperature dependence of the Fano resonance recently discovered in infrared spectra of nanodiamonds synthesized from chloroadamantane at high static pressures is investigated. For the first time, marked variations of the resonance parameters are observed. On heating, the shape of the Fano resonance changes considerably; the effect completely disappears above 350$^\circ$ C, but is recovered after cooling to ambient conditions. Such behavior implies that assignment of the Fano effect to the surface transfer doping mechanism is not very plausible for the studied samples. The resonance shape varies due to a strong temperature dependence of the difference between the frequencies of infrared-active “bright” and Raman-active “dark” modes of nanodiamond. The frequency of the Raman dark mode is only weakly temperature-dependent.

Received: 24.03.2022
Revised: 18.04.2022
Accepted: 24.04.2022

DOI: 10.31857/S1234567822110039


 English version:
Journal of Experimental and Theoretical Physics Letters, 2022, 115:11, 651–656


© Steklov Math. Inst. of RAS, 2024