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Iron chalcogenides superconductors, such as Fe (Te, Se) have recently garnered significant attention due to their simple crystal structure with a relatively easy synthesis process, high-temperature superconductivity, intrinsic topological band structure, and an unconventional pairing of superconductivity with ferromagnetism. Here, we report the complex in-plane refractive index measurement of nanometer-thin Fe (Te, Se) flake exfoliated from a single crystal FeTe₀. ₆Se₀. ₄ for photon wavelengths from 450 to 1100 nm over a temperature range from 4 K to 295 K. The results were obtained by employing a two-Drude model for the dielectric function of Fe (Te, Se), a multiband superconductor, and fitting the absolute optical reflection spectra using the transfer matrix method. A high extinction coefficient in the visible to near-infrared range makes nanometer-thin Fe (Te, Se) flakes a promising material for photodetection applications.
Pattanayak et al. (Fri,) studied this question.
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