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2000•Modern Physics Letters BRequires access

BINDING ENERGY OF BIEXCITONS IN A QUANTUM DISK

Wenfang Xie, D. L. Lin

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Abstract

The method of few-body physics is applied to treat a system of two excitons in a quantum disk. The binding energy of a biexciton is calculated for various confinements. It is found that the biexciton binding energy drops sharply to zero, i.e. there exists a critical radius RC, such that if R>RC (R C), the biexciton configuration is stable (unstable). From [Formula: see text], we obtain RC~0.5[Formula: see text], indicating the existence of a repulsive core of interaction between the two neutral excitons. The dependence of the ratio of biexciton binding energy to that of the exciton on the disk thickness is also investigated.

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What this paper is about

The method of few-body physics is applied to treat a system of two excitons in a quantum disk. The binding energy of a biexciton is calculated for various confinements. It is found that the biexciton binding energy drops sharply to zero, i.e. there exists a critical radius RC, such that if R>RC (R C), the biexciton configuration is stable (unstable). From [Formula: see text], we obtain RC~0.5[Formula: see text], indicating the existence of a repulsive core of interaction between the two neutral excitons. The dependence of the ratio of biexciton binding energy to that of the exciton on the disk thickness is also investigated.

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Available abstract

The method of few-body physics is applied to treat a system of two excitons in a quantum disk. The binding energy of a biexciton is calculated for various confinements. It is found that the biexciton binding energy drops sharply to zero, i.e. there exists a critical radius RC, such that if R>RC (R C), the biexciton configuration is stable (unstable). From [Formula: see text], we obtain RC~0.5[Formula: see text], indicating the existence of a repulsive core of interaction between the two neutral excitons. The dependence of the ratio of biexciton binding energy to that of the exciton on the disk thickness is also investigated.

Key concepts: Biexciton, Binding energy, Exciton, Physics, RADIUS, Energy (signal processing), Atomic physics, Quantum

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