Energy renormalization and binding energy of the biexciton

Abstract

We deduce the energy renormalization of the biexciton resonance in ZnSe quantum wells from polarization and intensity dependent pump-probe spectroscopy in the coherent regime. We confirm that the biexciton renormalization is exactly what one would expect from a compound particle of two excitons in opposite circular polarization states. Since the biexciton binding is measured with respect to the exciton resonance one has to consider the renormalization of the latter resonance as well. We present an exact method to determine the real biexciton binding energy using the low-excitation extrapolation of the exciton-to-biexciton transition energy.

Biexcitons in two-dimensional systems with spatially separated electrons and holes

“…Turning to the experimental implications of our theory, observations of biexcitons in single quantum well systems have been reported by many experimental groups. [9][10][11][12][13][14][15][16] In contrast, no biexciton signatures have ever been detected in electron-hole bilayers. Let us discuss how this can be understood based on our results.…”

Controllable amplification, absorption, and dispersion in double‐cascade‐type four‐level system of multiple quantum wells

“…Our studies to realize the double‐cascade four‐level system in semiconductor MQWs have exploited the use of exciton spin coherence 1–6, 15–24. For semiconductors such as a GaAs MQWs, the electron–hole pair is promoted by an electron from the valence band to the conduction band, the excitons are electron–hole pairs bound by their Coulomb attraction.…”

“…The quantum properties of these nanostructures such as the transition energies and dipole moments can be well manipulated by accurately tailoring their shapes and sizes or adjusting the external fields. In the proposed scheme, all parameters are from realistic experimental conditions 1, 6, 14–22.…”

Noise induced re-entrant transitions in exciton bistable system

“…The exciton-density dependence of the exciton resonance position has been intensely investigated by spectrally resolved four-wave mixing [7,8]. Furthermore, a sophisticated case of the energy renormalization of the biexciton resonance in ZnSe quantum wells takes place [9]. These examples indicate the importance of taking into consideration the dependence of the resonance frequency on the concentration of excitations in various systems.…”