Spin and energy transfer in nanocrystals without transport of charge

Abstract

We describe a mechanism of spin transfer between individual quantum dots that does not require tunneling. Incident circularly-polarized photons create inter-band excitons with non-zero electron spin in the first quantum dot. When the quantum-dot pair is properly designed, this excitation can be transferred to the neighboring dot via the Coulomb interaction with either {\it conservation} or {\it flipping} of the electron spin. The second dot can radiate circularly-polarized photons at lower energy. Selection rules for spin transfer are determined by the resonant conditions and by the strong spin-orbit interaction in the valence band of nanocrystals. Coulomb-induced energy and spin transfer in pairs and chains of dots can become very efficient under resonant conditions. The electron can preserve its spin orientation even in randomly-oriented nanocrystals.

13 pages, 3 figures

References in corpus (1)

• Detecting Spin-Polarized Currents in Ballistic Nanostructures

Cited by in corpus (18)

• Theory of plasmon-enhanced Foerster energy transfer in optically-excited semiconductor and metal nanoparticles
• Long-range radiative interaction between semiconductor quantum dots
• Spin-Forster transfer in optically excited quantum dots
• A solid state source of photon triplets based on quantum dot molecules
• Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity
• Molecular spintronics: Coherent spin transfer in coupled quantum dots
• Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules
• Radiative coupling of quantum dots in photonic crystal structures
• Coherent control of indirect excitonic qubits in optically driven quantum dot molecules
• Interplay of coupling and superradiant emmision in the optical response of a double quantum dot
• Phonon effects on the radiative recombination of excitons in double quantum dots
• Theory of nonlinear optical response of ensembles of double quantum dots
• Mass-profile quantum dots in graphene
• Forster energy transfer signatures in optically driven quantum dot molecules
• Coherent State Monitoring in Quantum Dots
• Decay and persistence of spatial coherence during phonon-assisted relaxation in double quantum dots
• Atomistic Theory of Coherent Spin Transfer between Molecularly Bridged Quantum Dots
• Radiative and phonon-induced dephasing in double quantum dots