Systematic investigation of THz-induced excitonic Rabi splitting

TL;DR

This study explores how terahertz and near-infrared excitations affect excitonic Rabi splitting in quantum wells, revealing complex behaviors like asymmetry and broadening that require advanced theoretical models.

Contribution

It provides the first systematic experimental investigation of THz-induced excitonic Rabi splitting in quantum wells, highlighting the need for microscopic theories and the role of higher excitonic states.

Findings

Pronounced anticrossing behavior observed

Splitting becomes asymmetric at high fields

Higher excitonic states are significant at elevated excitations

Abstract

Weak near-infrared and strong terahertz excitation are applied to study excitonic Rabi splitting in (GaIn)As/GaAs quantum wells. Pronounced anticrossing behavior of the split peaks is observed for different terahertz intensities and detunings relative to the intraexcitonic heavy-hole 1s-2p-transition. At intermediate to high electric fields the splitting becomes highly asymmetric and exhibits significant broadening. A fully microscopic theory is needed to explain the experimental results. Comparisons with a two-level model reveal the increasing importance of higher excitonic states at elevated excitation levels.