ListarQFA_Articles por tema "Quantum dots"

Mostrando ítems 1-15 de 15

    • openAccess   Charge control in laterally coupled double quantum dots 

      Muñoz Matutano, G.; Royo Valls, Miguel; Climente, Juan I.; Canet Ferrer, J.; Fuster, D.; Alonso-Jordá, Pedro; Fernández Martínez, Iván; Martínez-Pastor, Juan P.; González Diez, Yolanda; González Sotos, Luisa; Briones, Fernando; Alen Millán, B. American Physical Society (2011-07-27)
      We investigate the electronic and optical properties of InAs double quantum dots grown on GaAs (001) and laterally aligned along the [110] crystal direction. The emission spectrum has been investigated as a function of a ...

    • openAccess   Coupled donors in quantum dots: quantum size and dielectric mismatch effects 

      Movilla, Jose L.; Ballester Caudet, Ana; Planelles, Josep American Physical Society (2009)
      Spatial and dielectric confinement modulations of the spontaneous emission rates, transition energies, and charge-density distributions of a singly ionized double donor system (D2+) in a spherical quantum dot are calculated ...

    • openAccess   Dielectric confinement in quantum dots of arbitrary shape within the local spin density approximation: Diluted regimes in elongated quantum dots 

      Movilla, Jose L.; Pi, Martí; Planelles, Josep American Institute of Physics (2010)
      We propose a simplified and computationally feasible model accounting for the dielectric confinement in arbitrarily shaped many-electron quantum dots, within the local spin density approximation. The model yields quite ...

    • openAccess   Dielectric control of spin in semiconductor spherical quantum dots 

      Royo Valls, Miguel; Rajadell Viciano, Fernando; Planelles, Josep American Institute of Physics (2008)
      The ground state electronic configuration of semiconductor spherical quantum dots populated with different numbers of excess electrons, for different radii and dielectric constants of the embedding medium is calculated ...

    • openAccess   Dominant channels of exciton spin relaxation in photoexcited self-assembled (In,Ga)As quantum dots 

      Liao, Yu-Huai; Climente, Juan I.; Cheng, Shun-Jen American Physical Society (2011-04-22)
      We present a comprehensive theoretical investigation of spin relaxation processes of excitons in photoexcited self-assembled quantum dots. The exciton spin relaxations are considered between dark- and bright-exciton states ...

    • openAccess   Electrons, holes, and excitons in GaAs polytype quantum dots 

      Climente, Juan I.; Segarra, Carlos; Rajadell Viciano, Fernando; Planelles, Josep American Institute of Physics (2016)
      Single and multi-band k⋅p Hamiltonians for GaAs crystal phase quantum dots are used to assess ongoing experimental activity on the role of such factors as quantum confinement, spontaneous polarization,valence band mixing, ...

    • openAccess   Emission spectrum of quasiresonant laterally coupled quantum dots 

      Royo Valls, Miguel; Climente, Juan I.; Planelles, Josep American Physical Society (2011-12-21)
      We calculate the emission spectrum of neutral and charged excitons in a pair of laterally coupled InGaAs quantum dots with nearly degenerate energy levels. As the interdot distance decreases, a number of changes take place ...

    • openAccess   Exciton storage in type-ll quantum dots using the optical Aharonov-Bohm effect 

      Climente, Juan I.; Planelles, Josep AIP Publishing (2014-05-12)
      We investigate the bright-to-dark exciton conversion efficiency in type-II quantum dots subject to a perpendicular magnetic field. To this end, we take the exciton storage protocol recently proposed by Simonin and ...

    • openAccess   From quantum dots to quantum wires: electronic structure of semiconductor nanorods 

      Planelles, Josep; Royo Valls, Miguel; Ballester Caudet, Ana; Pi, Martí American Physical Society (2009)
      The transition bridge between zero-dimensional quantum dots and one-dimensional quantum wires is explored theoretically by means of the construction of the addition energy spectra of nanorods with different lengths. Spin ...

    • openAccess   Hole spin mixing in InAs Quantum Dot Molecules 

      Doty, Matthew F.; Climente, Juan I.; Greilich, A.; Yakes, Michael; Bracker, Allan S.; Gammon, Daniel American Physical Society (2010)
      The spin state of holes confined in single InAs quantum dots have recently emerged as a promising system for the storage or manipulation of quantum information. These holes are often assumed to have no mixing between ...

    • openAccess   Large hole spin anticrossings in InAs/GaAs double quantum dots 

      Rajadell Viciano, Fernando; Planelles, Josep; Climente, Juan I. AIP Publishing (2013-09-23)
      We show that hole states in InAs/GaAs double quantum dots can exhibit spin anticrossings of up to 1 meV, according to simulations with a three dimensional Burt-Foreman Hamiltonian including strain and piezoelectric fields. ...

    • openAccess   Mixed correlation phases in elongated quantum dots 

      Ballester Caudet, Ana; Escartín, J. M.; Movilla, Jose L.; Pi, Martí; Planelles, Josep American Physical Society (2010-09-07)
      It is theoretically shown, within the local spin-density-functional theory framework, that inhomogeneous confining potentials in elongated, diluted N-electron quantum dots may lead to the formation of mixed phases in which ...

    • openAccess   Strong configuration mixing due to dielectric confinement in semiconductor nanorods 

      Climente, Juan I.; Royo Valls, Miguel; Movilla, Jose L.; Planelles, Josep American Physical Society (2009)
      The interaction between electron-electron and electron-hole pairs in semiconductor nanorods embedded in dielectric media is investigated using a configuration-interaction method. Contrary to spherical quantum dots of similar ...

    • openAccess   Temperature dependence of the spectral band shape of CdSe nanodots and nanorods 

      Climente, Juan I.; Planelles, Josep; Rajadell Viciano, Fernando American Physical Society (2009)
      We study theoretically the effect of thermal population on the emission spectrum of single CdSe nanocrystals. Quantum confinement leads to nonsimple emission band shapes, which have different characteristics for excitons, ...

    • openAccess   Two-Photon Induced Blue Shift of Core and Shell Optical Transitions in Colloidal CdSe/CdS quasi-type II Quantum Rods 

      Allione, Marco; Ballester Caudet, Ana; Li, Hongbo; Comin, Alberto; Movilla, Jose L.; Climente, Juan I.; Manna, Liberato; Moreels, Iwan American Chemical Society (2013-03)
      The spectral dependence of the two-photon absorption in CdSe/CdS core/shell nanocrystal heterorods has been studied via two-photon-induced luminescence excitation spectroscopy. We verified that the two-photon absorption ...