Fine structure of two-electron states in single and double quantum dots

Abstract

Energy spectrum fine structure of triplet two-electron states is investigated theoretically. Spin-orbit interaction induced terms in the effective Hamiltonian of electron-electron interaction are derived for zinc-blende lattice semiconductor nanostructures: quantum wells and quantum dots. The effects of bulk and structural inversion asymmetry are taken into account. Simple analytical expressions describing the splittings of the two-electron states localized in a single quantum dot and in a lateral double quantum dot are derived. The spin degeneracy of triplet states is shown to be completely lifted by the spin-orbit interaction. An interplay of the conduction band spin splitting and the spin-orbit terms in electron-electron interaction is discussed. The photoluminescence spectra of hot trions and of doubly charged excitons are calculated and are shown to reveal the fine structure of two-electron states.

9 pages, 6 figures

References in corpus (3)

• Spin-orbit mediated anisotropic spin interaction in interacting electron systems
• Fine structure and optical pumping of spins in individual semiconductor quantum dots
• Spin-orbit effect on electron-electron interaction and fine structure of electron complexes in quantum dots

Cited by in corpus (5)

• Spin relaxation in multiple (110) quantum wells
• Valley and spin accumulation in ballistic and hydrodynamic channels
• Magneto-spectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots
• Spin current generation from Coulomb-Rashba interaction in semiconductor bilayers
• Spin-Orbit Interaction Enabled High-Fidelity Two-Qubit Gates