Abstract
The surface polarization instabilities of a Coulomb-interacting electron-hole pair in a spherical semiconductor quantum dot inside a dielectric medium are studied. Two independent numerical solutions for the ground state are presented which are based on a direct integration of the pair Schrödinger equation or on a diagonalization of the Hamiltonian matrix. For decreasing confinement potential at fixed dot radius, and for decreasing dot radius at fixed confinement potential, it is found that the electron-hole-pair state changes from a volume state, in which both particles are mostly inside the dot, to a surface trapped state, in which the surface polarization causes the carriers to be self-trapped at the surface of the dot. The transition from volume to surface trapped states occurs for parameters which are very close to those of II-VI semiconductors in a glass matrix or in a liquid.
Original language | English (US) |
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Pages (from-to) | 14136-14142 |
Number of pages | 7 |
Journal | Physical Review B |
Volume | 45 |
Issue number | 24 |
DOIs | |
State | Published - 1992 |
ASJC Scopus subject areas
- Condensed Matter Physics