Quantum Field Effects in Stationary Electron Spin Resonance Spectroscopy

TL;DR

This paper demonstrates the observation of quantum Rabi oscillations and acoustic spin resonance in ESR spectroscopy of anthracites, revealing long-lived coherent phonon states and room-temperature superconductivity induced by strong electron-photon and electron-phonon interactions.

Contribution

It provides experimental evidence of quantum Rabi oscillations and acoustic spin resonance in ESR, and introduces a new model of instantons related to superconductivity at room temperature.

Findings

First observation of acoustic quantum Rabi oscillations in ESR.

Long-lived coherent phonon states exceeding 4.6 minutes at room temperature.

Evidence of room-temperature superconductivity in anthracite samples.

Abstract

It is proved on the example of electron spin resonance (ESR) studies of anthracites, that by strong electron-photon and electron-phonon interactions the formation of the coherent system of the resonance phonons takes place. The acoustic quantum Rabi oscillations were observed for the first time in ESR-spectroscopy. Its Rabi frequency value on the first damping stage was found to be equal 920.6 kHz, being to be independent on the microwave power level in the range 20 - 6 dB [0 dB corresponds to 100 mW]. By the subsequent increase of the microwave power the stepwise transition to the phenomenon of nonlinear quantum Rabi oscillations, characterised by splitting of the oscillation group of lines into two subgroups with doubling of the total lines' number takes place. Linewidth of an individual oscillation line becomes approximately the twofold narrower, being to be equal the only to $0.004 \pm 0.001$ G. Along with the absorption process of EM-field energy the emission process was observed. It was found, that the emission process is the realization of the acoustic spin resonance, the source of acoustic wave power in which is the system of resonance phonons, accumulated in the samples by the registration with AFC. It has been found, that the lifetime of coherent state of a collective subsystem of resonance phonons in anthracites is very long and even by room temperature it is evaluated by the value exceeding 4.6 minutes. The model of new kinds of instantons was proposed. They are considered to be similar in the mathematical structure to Su-Schrieffer-Heeger solitons with "propagation" direction along time $t$-axis instead of space $z$-axis. The proof, that the superconductivity state in the anthracite samples studied is produced at the room temperature in ESR conditions in the accordance with the theory of the quantised acoustic field, has experimentally been obtained.