Theoretical Description of Coherent Doublon Creation via Lattice Modulation Spectroscopy
A. Dirks, K. Mikelsons, H.R. Krishnamurthy, J.K. Freericks
TL;DR
This paper develops a comprehensive strong-coupling theoretical framework for doublon creation in ultracold fermionic atoms in optical lattices, aligning well with experimental data and predicting nonlinear two-photon excitations at high modulation amplitudes.
Contribution
It introduces a new strong-coupling theoretical method for describing doublon production in lattice modulation spectroscopy of ultracold atoms.
Findings
The theory matches experimental doublon production time traces.
Predicts nonlinear two-photon excitation at high modulation amplitudes.
Provides quantitative predictions for experimental conditions.
Abstract
Using a recently developed strong-coupling method, we present a comprehensive theory for doublon production processes in modulation spectroscopy of a three-dimensional system of ultracold fermionic atoms in an optical lattice with a trap. The theoretical predictions compare well to the experimental time traces of doublon production. For experimentally feasible conditions, we provide a quantitative prediction for the presence of a nonlinear "two-photon" excitation at strong modulation amplitudes.
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