6533b860fe1ef96bd12c2e98

RESEARCH PRODUCT

Unavoidable decoherence in semiconductor quantum dots

Lucjan JacakPaweł MachnikowskiWitold JacakRyszard GonczarekJ. Krasnyj

subject

PhysicsQuantum decoherenceCondensed matter physicsDephasingQuantum point contactCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCondensed Matter::Materials Sciencesymbols.namesakePauli exclusion principleQuantum dot laserQuantum dotQuantum mechanicsPrincipal quantum numbersymbolsCondensed Matter::Strongly Correlated ElectronsQuantum dissipation

description

Phonon-induced unavoidable decoherence of orbital degrees of freedom in quantum dots is studied and the relevant time scales are estimated. Dephasing of excitons due to acoustic phonons and, in a polar medium, to optical phonons, including anharmonic effects and enhancement of the effective Fr\"ohlich constant due to localization, is assessed for typical self-assembled quantum dots. Temporal inefficiency of Pauli blocking due to lattice inertia is predicted. For quantum dots placed in a diluted magnetic semiconductor medium a magnon-induced dephasing of a spin is also estimated in accordance with experimental results.

yearjournalcountryeditionlanguage
2005-12-07Physical Review B
https://doi.org/10.1103/physrevb.72.245309