Effect of strain and variable mass on the formation of antibonding hole ground states in InAs quantum dot molecules
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Otros documentos de la autoría: Planelles, Josep; Climente, Juan I.; Rajadell Viciano, Fernando; Doty, Matthew F.; Bracker, Allan S.; Gammon, Daniel
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Título
Effect of strain and variable mass on the formation of antibonding hole ground states in InAs quantum dot moleculesAutoría
Fecha de publicación
2010-10-04Editor
American Physical SocietyISSN
1098-0121; 1550-235XCita bibliográfica
Physical Review B (2010) vol. 82, no. 15Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://prb.aps.org/abstract/PRB/v82/i15/e155307Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Using four-band k·p Hamiltonians, we study how biaxial strain and position-dependent effective masses influence hole tunneling in vertically coupled InAs/GaAs quantum dots. Strain reduces the tunneling and hence the ... [+]
Using four-band k·p Hamiltonians, we study how biaxial strain and position-dependent effective masses influence hole tunneling in vertically coupled InAs/GaAs quantum dots. Strain reduces the tunneling and hence the critical interdot distance required for the ground state to change from bonding to antibonding. The reduced spin-orbit interaction in the GaAs matrix, which we account for using position-dependent Luttinger parameters, has the opposite effect. This compensation results in the critical distance being little affected. The possibility to induce the bonding-to-antibonding transition using longitudinal magnetic fields is also investigated. Luttinger- Kohn Hamiltonian predicts a magnetic enhancement of the heavy hole-light hole coupling which, in turn, leads to such transition. No such effect is, however, observed in magnetophotoluminescence experiments. An alter- native implementation of the magnetic field in the envelope function Hamiltonian is given which retrieves the experimental behavior. [-]
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© American Physical Society
info:eu-repo/semantics/openAccess
© American Physical Society
info:eu-repo/semantics/openAccess
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