Excitons and Biexcitons in Spheroidal Quantum Dots A{sub 2}B{sub 6}

Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783418080073· OSTI ID:22771061

Semina, M. A.; Rodina, A. V.; Shubina, T. V. ^[1]

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1. Ioffe Institute (Russian Federation)

In the limit of strong quantum confinement the lower energy states of excitons and biexcitons in spheroidal quantum dots of semiconductors with a fourfold degenerate vertex of the valence band, which are active in the dipole approximation at one- and two-photon excitation, have been considered. The comparative analysis of the order of energy levels of the hole in the potentials of the infinitely deep quantum well and a three-dimensional harmonic oscillator taking into account the axial anisotropy of the quantum dot (QD) shape is carried out. It is shown that the anisotropy of the QD shape can lead to the opposite sign of splitting with respect to angular momentum projection ±3/2, ±1/2 for spatially odd (1P{sub 3/2}) and even (1S{sub 3/2}) levels of the hole. At the same time, in the case of the potential of an infinitely deep quantum well, an inversion of the order of 1S{sub 3/2} and 1P{sub 3/2} levels can be observed at values of the ratio of the effective masses of the light and heavy holes β = m{sub lh}/m{sub hh} ≈ 0.14. The type of the trial wave functions of the hole for the state 1P{sub 3/2} in the potential of an isotropic three-dimensional harmonic oscillator depending on β is proposed. The dependence of the binding energy of excitons in the considered potentials on β is presented and the possibility of formation of various biexcitonic states is considered.

• OSTI ID: 22771061
• Journal Information: Physics of the Solid State, Vol. 60, Issue 8; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ANISOTROPY
APPROXIMATIONS
BINDING ENERGY
DIPOLES
EXCITATION
EXCITONS
HARMONIC OSCILLATORS
MASS
OSCILLATORS
PHOTONS
QUANTUM DOTS
QUANTUM WELLS
S STATES
SEMICONDUCTOR MATERIALS
SIMULATION
THREE-DIMENSIONAL LATTICES
VALENCE
WAVE FUNCTIONS