# Spin dynamics and spin-dependent recombination of a polaron pair under a strong ac drive

## TL;DR

This paper theoretically investigates how a strong ac drive influences spin-dependent recombination in a polaron pair, revealing that the decay rates are dominated by zero-crossings of the drive and exhibit power-law dependence on drive amplitude.

## Contribution

It introduces a model for recombination dynamics under strong ac drive without the rotating wave approximation, highlighting the impact on decay rates and spin state mixing.

## Key findings

- Decay rates are dominated by short intervals at drive zero-crossings
- Fast recombination in singlet states leads to slow decay in triplet states
- Decay rate decreases as a power law with increasing drive amplitude

## Abstract

We study theoretically the recombination within a pair of two polarons in magnetic field subject to a strong linearly polarized ac drive. Strong drive implies that the Zeeman frequencies of the pair-partners are much smaller than the Rabi frequency, so that the rotating wave approximation does not apply. What makes the recombination dynamics nontrivial, is that the partners recombine only when they form a singlet, S. By admixing singlet to triplets, the drive induces the triplet recombination as well. We calculate the effective decay rate of all four spin modes. Our main finding is that, under the strong drive, the major contribution to the decay of the modes comes from short time intervals when the driving field passes through zero. When the recombination time in the absence of drive is short, fast recombination from S leads to anomalously slow recombination from the other spin states of the pair. We show that, with strong drive, this recombination becomes even slower. The corresponding decay rate falls off as a power law with the amplitude of the drive.