Review of Strong Field Approximation and Investigating Semiclassical Evolution Approach

TL;DR

This paper compares strong field approximation and semiclassical approaches to analyze atomic behavior in strong electromagnetic fields, demonstrating the semiclassical method's potential for efficient and accurate predictions.

Contribution

It introduces a semiclassical approach to solve the Volkov wave function and compares it with traditional strong field approximation, highlighting its effectiveness in low-frequency regimes.

Findings

Simulation aligns with theory and experiments within reasonable differences.

Semiclassical approximation accurately predicts particle evolution in strong fields.

Potential for semiclassical methods to simplify complex quantum systems.

Abstract

This paper theoretically analyzes the behavior of an atom driven by a strong electro-magnetic field. Moreover, besides traditional quantum mechanics method, we also investigate semiclassical approaches to this problem. We first performed strong field approximation for system of an atom driven by a strong electromagnetic field in velocity gauge. Our simulation result is consistent with theories and close to experiments except some reasonable difference caused by different parameters and omitted bound and final states in the transition amplitude. Next, a new semiclassical approach is used to solve Volkov wave function. We prove that semiclassical approximation works well in predicting the particle evolution in quantum world, especially for system in a strong electromagnetic field with low frequency. Finally, we also briefly illustrated how to use semiclassical approximation to get the same results as strong field approximation and also partly tested the viability of the semiclassical approach to Teller Potential. This part needs future work to accomplish. But still, semiclassical approximation provides a potentially new method to solve complicated system, which might be more effective than traditional quantum mechanics recipe.