4.7 Article

Pressure dependent thermoreflectance spectroscopy induced by interband transitions in metallic nano-film

期刊

ISCIENCE
卷 24, 期 9, 页码 -

出版社

CELL PRESS
DOI: 10.1016/j.isci.2021.102990

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资金

  1. National Natural Science Foundation of China [51720105007, 51976025]
  2. Fundamental Research Funds for the Central Universities [DUT20RC(5)023, 19CX02014A]

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Utilizing high pressure to modulate the optical properties of Al nano-film, this study found that the dR/dT values exhibit a sine-like pressure dependence, with the zero-crossing occurring at around 6 GPa, which can be explained from the perspective of electron transitions.
Utilizing high-pressure tomodulate optical properties, such as thermoreflectance (dR/dT), over a wide range has received much attention. Nevertheless, how the pressure exerts on the complex dielectric constant and finally on dR/dT remains elusive. Here, we perform a thoroughly experimental and theoretical investigation on dR/dT of Al nano-film from 0 to 25 GPa. The dR/dT values exhibit a sinelike pressure-dependence, with the zero-crossing appearing at around 6 GPa. These special phenomena are well explained from electron transition viewpoints. The first-principles calculations show that the energy difference of parallel bands is enlarged from 1.45 to 2 eV, thereby increasing the threshold for electron transitions. The lifted threshold changes the optical absorption rates of Al and the density of states of the electrons involving interband transitions; finally, the resulting dR/dT exhibits such a pressure-dependent behavior. Our findings provide a deep insight on pressure-induced electronic transitions and photon-electron interactions in metals.

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