6533b837fe1ef96bd12a293d

RESEARCH PRODUCT

Electron-hole bilayer quantum dots: Phase diagram and exciton localization

M KoskinenStephanie ReimannK. KarkkainenM. Manninen

subject

Strongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsChemistryBilayerExcitonJahn–Teller effectFOS: Physical sciencesGeneral ChemistryElectron holeElectronCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter - Strongly Correlated ElectronsQuantum dotMesoscale and Nanoscale Physics (cond-mat.mes-hall)Materials ChemistryGround statePhase diagram

description

We studied a vertical ``quantum dot molecule'', where one of the dots is occupied with electrons and the other with holes. We find that different phases occur in the ground state, depending on the carrier density and the interdot distance. When the system is dominated by shell structure, orbital degeneracies can be removed either by Hund's rule, or by Jahn-Teller deformation. Both mechanisms can lead to a maximum of the addition energy at mid-shell. At low densities and large interdot distances, bound electron-hole pairs are formed.

yearjournalcountryeditionlanguage
2003-10-15
10.1016/j.ssc.2004.02.003http://arxiv.org/abs/cond-mat/0310338