Instanton Induced Tunneling Amplitude at Excited States with the LSZ Method
J.-G. Zhou, J.-Q. Liang, J. Burzlaff, H.J.W. Mueller-Kirsten

TL;DR
This paper extends the instanton method to calculate tunneling amplitudes at excited states using LSZ reduction, which could impact the study of macroscopic quantum phenomena in magnetic systems.
Contribution
It introduces a novel extension of the instanton approach to excited states via LSZ reduction, bridging quantum field theory techniques with tunneling calculations.
Findings
Extended instanton method to excited states
Applied LSZ reduction to tunneling problems
Potential implications for magnetic quantum systems
Abstract
Quantum tunneling between degenerate ground states through the central barrier of a potential is extended to excited states with the instanton method. This extension is achieved with the help of an LSZ reduction technique as in field theory and may be of importance in the study of macroscopic quantum phenomena in magnetic systems.
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