A Generalized Open Quantum System Approach for the Electron Paramagnetic Resonance of Magnetic Atoms

TL;DR

This paper introduces a generalized open quantum system approach using novel Bloch equations to accurately model the electron paramagnetic resonance of magnetic atoms, explaining experimental anomalies not addressed by standard methods.

Contribution

It develops a new generalized Bloch equation framework with microscopic modeling to explain experimental features of magnetic atoms in STM setups, surpassing conventional approaches.

Findings

Successfully explains asymmetric lineshapes and large decoherence-to-decay ratios

Provides a versatile modeling approach for future experiments and quantum devices

Addresses limitations of standard Bloch equations in describing magnetic atom resonance

Abstract

A recent experimental breakthrough allowed to probe electronic parametric resonance of a single magnetic atom in an STM setup. The results present intriguing features, such as an asymmetric lineshape and unusually large ratio of the decoherence and decay rates, which defy standard approaches using the conventional Bloch equations. To address these issues we employ novel generalized Bloch equations, together with proper microscopic modeling of the magnetic adatom, and show how all the experimental features can naturally be accounted for. The proposed approach may also be useful in treating any future similar experiments, as well as next generation hybrid quantum devices.