Funct. Mater. 2021; 28 (3): 415-419.
Internal photoelectric effect and possible superconductivity of group V elements (semimetals)
1V.N.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
2Institute for Scintillation Materials, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine
The possibility of using the internal photoelectric effect to transfer semimetals (Bi, Sb, etc.) to a superconducting state at atmospheric pressure and room temperature is discussed. Irradiation of a semimetal with photons of a certain energy and flux power density can cause a significant change in its energy spectrum ("metallized" semimetals with "degenerate" electrons), and also the appearance of an increased fraction of optical phonons in this substance. In accordance with the microscopic theory of superconductivity in metals (BCS theory), both of these factors should determine the effective electron-phonon interaction and, as a consequence, can cause the transition of semimetals to the superconducting state. According to the estimates given in the work, the superconducting state in the near-surface semimetal layer with a thickness ~10-6 m (or in film) at temperatures close to room one can be realized under conditions of their laser irradiation with a wavelength λ ~10-5 m and pulse duration ≈10-8 s when power density ~1011 W/m2 is reached.
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