Effect of phonons on the electron spin resonance absorption spectrum
- URL: http://arxiv.org/abs/2004.10355v2
- Date: Fri, 24 Apr 2020 14:59:23 GMT
- Title: Effect of phonons on the electron spin resonance absorption spectrum
- Authors: Ariel Norambuena, Alejandro Jimenez, Christoph Becher and Jer\'onimo
R. Maze
- Abstract summary: We model the effect of phonons and temperature on the electron spin resonance (ESR) signal in magnetically active systems.
We find that the suppression of ESR signals is due to phonon broadening but not based on the common assumption of orbital quenching.
- Score: 62.997667081978825
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The unavoidable presence of vibrations in solid-state devices can drastically
modify the expected electron spin resonance (ESR) absorption spectrum in
magnetically active systems. In this work, we model the effect of phonons and
temperature on the ESR signal in molecular systems with strong $E \otimes e$
Jahn-Teller (JT) effect and an electronic spin-$1/2$. Our microscopic model
considers the linear JT interaction with a continuum of phonon modes, the
spin-orbit coupling, the Zeeman effect, and the response of the system under a
weak oscillating magnetic field. We derive a Lindblad master equation for the
orbital and spin degrees of freedom, where one- and two-phonon processes are
considered for the phonon-induced relaxation, and the thermal dependence of Ham
reduction factors is calculated. We find that the suppression of ESR signals is
due to phonon broadening but not based on the common assumption of orbital
quenching. Our results can be applied to explain the experimentally observed
absence of the ESR signal in color centers in diamond, such as the neutral
nitrogen-vacancy and negatively charged silicon-vacancy color centers in
diamond.
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