Low Temperature Physics: 47, 693 (2021); https://doi.org/10.1063/10.0005558
Fizika Nizkikh Temperatur: Volume 47, Number 8 (August 2021), p. 753-759    ( to contents , go back )

Nuclear and electronic coherence in superfluid helium

Yu. M. Poluektov

National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv 61108, Ukraine
E-mail: yuripoluektov@kipt.kharkov.ua
pos Анотація:913

Received March 17, 2021, published online June 25, 2021

Abstract

A semi-phenomenological model of a many-particle system of 4He atoms is proposed, in which a helium atom is considered as a complex consisting of a nucleus and a bound pair of electrons in the singlet state. At zero temperature, there are two Bose–Einstein condensates of particles with opposite charges, namely, a condensate of positively charged nuclei and a condensate of negatively charged electron pairs. It is shown that in such a system there exist two excitation branches: sound and optical. On the basis of this model an interpretation of experiments on the study of the electrical activity of superfluid helium is proposed. The frequency at which the resonant absorption of a microwave radiation is observed is interpreted as a gap in the optical branch. It is shown that the distribution of the electric potential in a standing wave in a resonator is similar to that observed experimentally.

Key words: helium atom, boson, sound and optical vibrations, superfluidity, electrical activity, Bose–Einstein condensate, coherent state.

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