Two-dimensional Fourier transform spectroscopy of exciton-polaritons and their interactions

Abstract

We investigate polariton-polariton interactions in a semiconductor microcavity through two-dimensional Fourier transform (2DFT) spectroscopy. We observe, in addition to the lower-lower and the upper-upper polariton self-interactions, a lower-upper cross interaction. This appears as separated peaks in the on-diagonal and off-diagonal parts of 2DFT spectra. Moreover, we elucidate the role of the polariton dispersion through a fine structure in the 2DFT spectrum. Simulations, based on lower-upper polariton basis Gross-Pitaevskii equations including both self-and cross interactions, result in a 2DFT spectra in qualitative agreement with experiments.

Two-dimensional infrared spectroscopy of vibrational polaritons of molecules in an optical cavity

“…Multidimensional spectroscopic studies for electronically excited states in semiconductor cavity for nano-particles like In 0.04 Ga 0.96 As has been demonstrated 12,27 . Similarly, electronic exciton-polariton interactions of quantum wells in microcavity 28 has also been reported. Bipolaritons generated using four wave mixing techniques have been used as efficient entangled photon source 29,30 .…”

Spatial multistability induced by cross interactions of confined polariton modes

“…To derive our mean field coupled equation system, we start with the usual exciton-photon Hamiltonian [63][64][65]:…”

Dephasing effects on coherent exciton-polaritons and the breakdown of the strong coupling regime

“…The polariton interactions, mediated by their excitonic part, make semiconductor microcavities a suitable platform for investigating a wide range of physical phenomena where coherence is a major issue, including Bose-Einstein condensation [2,3] or collective quantum fluid effects [4][5][6]. Experimentally, the coherent dynamics of polaritons have been investigated using four-wave mixing [5][6][7][8][9] and pumpprobe techniques [10][11][12][13], where the excitonic nonlinearity is evidenced through the changes in the optical response of the system. Theoretically, the coherent dynamics of polaritons are usually modeled using a nonlinear Schrödinger equation, which is formally equivalent to a Gross-Pitaevskii equations (GPE), often used for describing the coherent ground state of Bose condensed dilute atoms.…”