Listar QFA_Articles por autoría "1d710bd6-53b0-4209-88a1-b849973ef67d"
Mostrando ítems 1-20 de 62
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A simple variational quantum Monte Carlo-effective mass approach for excitons and trions in quantum dots
Planelles, Josep; Climente, Juan I. Elsevier (2021)A computational model is presented to calculate the ground state energy of neutral and charged excitons confined in semiconductor quantum dots. The model is based on the variational Quantum Monte Carlo method and effective ... -
Aharonov-Bohm oscillations and electron gas transitions in hexagonal core-shell nanowires with an axial magnetic field
Royo Valls, Miguel; Segarra, Carlos; Bertoni, Andrea; Goldoni, Guido; Planelles, Josep American Physical Society (2015)We use spin-density-functional theory within an envelope function approach to calculate electronic states in a GaAs/InAs core-shell nanowire pierced by an axial magnetic field. Our fully three-dimensional quantum modeling ... -
Anisotropy of spin–orbit induced electron spin relaxation in [001] and [111] grown GaAs quantum dots
Segarra, Carlos; Planelles, Josep; Climente, Juan I.; Rajadell Viciano, Fernando IOP Publishing (2015)We report a systematic study of the spin relaxation anisotropy between single electron Zeeman sublevels in three-dimensional cuboidal GaAs quantum dots (QDs). The QDs are subject to an in-plane magnetic field. As the field ... -
Auger Recombination Suppression in Nanocrystals with Asymmetric Electron–Hole Confinement
Climente, Juan I.; Movilla, Jose L.; Planelles, Josep WILEY-VCH Verlag (2012)Type II and quasi-type II nanocrystals with thick shells exhibit reduced blinking. However, after a number of monolayers, the influence of the shell thickness is found to vanish. Using a two-band Kane Hamiltonian, it is ... -
Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals
Christodoulou, Sotirios; Rajadell Viciano, Fernando; Casu, Alberto; Vaccaro, Gianfranco; Grim, Joel Q.; Genovese, Alessandro; Manna, Liberato; Climente, Juan I.; Meinardi, Francesco; Rainò, Gabriele; Stöferle, Thilo; Mahrt, Rainer F.; Planelles, Josep; Brovelli, Sergio; Moreels, Iwan Nature Publishing Group (2015)Strain in colloidal heteronanocrystals with non-centrosymmetric lattices presents a unique opportunity for controlling optoelectronic properties and adds a new degree of freedom to existing wavefunction engineering and ... -
Beyond universal volume scaling: tailoring two-photon absorption in nanomaterials by heterostructure design
Alo, Arthur; Barros, Leonardo; Nagamine, Gabriel; Cotrino Lemus, Jonathan; Planelles, Josep; Movilla, Jose L.; Climente, Juan I.; Lee, Hak June; Bae, Wan Ki; Padilha, Lazaro ACS Publications (American Chemical Society) (2023-07-28)Colloidal semiconductor nanomaterials present broadband, with large cross-section, two-photon absorption (2PA) spectra, which turn them into an important platform for applications that benefit from a high nonlinear optical ... -
CdSe/CdS/CdTe Core/Barrier/Crown Nanoplatelets: Synthesis, Optoelectronic Properties, and Multiphoton Fluorescence Upconversion
Khan, Ali Hossain; Bertrand, Guillaume H. V.; Teitelboim, Ayelet; M, Chandra Sekhar; Polovitsyn, Anatolii; Brescia, Rosaria; Planelles, Josep; Climente, Juan I.; Oron, Dan; Moreels, Iwan American Chemical Society (2020-04-10)Colloidal two-dimensional (2D) nanoplatelet heterostructures are particularly interesting as they combine strong confinement of excitons in 2D materials with a wide range of possible semiconductor junctions due to a ... -
Characteristic molecular properties of one-electron double quantum rings under magnetic fields
Climente, Juan I.; Planelles, Josep Institute of Physics (2008)The molecular states of conduction electrons in laterally coupled quantum rings are investigated theoretically. The states are shown to have a distinct magnetic field dependence, which gives rise to periodic fluctuations ... -
Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded Quantum Dots
Masi, Sofia; Echeverría-Arrondo, Carlos; muhammed, kunnummal; Ngo, Thi Tuyen; Mendez, Perla F.; López-Fraguas, Eduardo; Macias-Pinilla, David F.; Planelles, Josep; Climente, Juan I.; Mora-Sero, Ivan American Chemical Society (2020-01-6)The approaches to stabilize the perovskite structure of formamidinium lead iodide (FAPI) commonly result in a blue shift of the band gap, which limits the maximum photoconversion efficiency. Here, we report the use of PbS ... -
Chloride-Induced Thickness Control in CdSe Nanoplatelets
Christodoulou, Sotirios; Climente, Juan I.; Planelles, Josep; Brescia, Rosaria; Prato, Mirko; Martín García, Beatriz; Khan, Ali Hossain; Moreels, Iwan ACS Publications (2018)Current colloidal synthesis methods for CdSe nanoplatelets (NPLs) routinely yield samples that emit, in discrete steps, from 460 to 550 nm. A significant challenge lies with obtaining thicker NPLs, to further widen the ... -
Comparison between Trion and Exciton Electronic Properties in CdSe and PbS Nanoplatelets
Macias-Pinilla, David F.; Planelles, Josep; Mora-Sero, Ivan; Climente, Juan I. American Chemical Society (2021-07-07)The optoelectronic properties of metal chalcogenide colloidal nanoplatelets are often interpreted in terms of excitonic states. However, recent spectroscopic experiments evidence the presence of trion states, enabled ... -
Configuration interaction approach to Fermi liquid-Wigner crystal mixed phases in semiconductor nanodumbbells
Planelles, Josep; Movilla, Jose L.; Ballester Caudet, Ana; Escartín, J. M.; Pi, Martí American Institute of Physics (AIP) (2012)Full configuration interaction calculations demonstrate the existence of mixed correlation phases in truly three-dimensional elongated nanocrystals subject to inhomogeneous spatial confining potentials. In such phases, the ... -
Correlation in narrow nanorods: a variational potential–configuration interaction scheme
Planelles, Josep; Climente, Juan I.; Royo Valls, Miguel; Movilla, Jose L. Institute of Physics (2009)Abstract. Full configuration interaction calculations of two electrons in narrow semiconductor nanorods are carried out employing different orbital basis sets. It is shown that the usual configurations built from ... -
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 ... -
Delocalized image surface states in defects free SiO2 hollow nanospheres
Movilla, Jose L.; Rajadell Viciano, Fernando; Planelles, Josep American Institute of Physics (2008)Delocalized image surface states in free-standing hollow silica nanospheres populated with one or two electrons or an exciton are theoretically predicted for a wide range of internal radii and shell thicknesses. The ... -
Dielectric Confinement Enables Molecular Coupling in Stacked Colloidal Nanoplatelets
Movilla, Jose L.; Planelles, Josep; Climente, Juan I. American Chemical Society (2020-04-09)We show theoretically that carriers confined in semiconductor colloidal nanoplatelets (NPLs) sense the presence of neighbor, cofacially stacked NPLs in their energy spectrum. When approaching identical NPLs, the otherwise ... -
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 ... -
Dielectric confinement of excitons in type-I and type-II semiconductor nanorods
Royo Valls, Miguel; Climente, Juan I.; Movilla, Jose L.; Planelles, Josep Institute of Physics (2011-01-12)We theoretically study the effect of the dielectric environment on the exciton ground state of CdSe and CdTe/CdSe/CdTe nanorods. We show that insulating environments enhance the exciton recombination rate and blueshift the ... -
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 ... -
Dielectric polarization in axially-symmetric nanostructures: A computational approach
Movilla, Jose L.; Climente, Juan I.; Planelles, Josep Elsevier (2010)A computational scheme to evaluate exactly the effects of the dielectric mismatch in semiconductor nanostructures with axial symmetry is presented. It is based on the numerical computation of the image charges induced by ...