Listar por autoría "88694efd-397f-4218-8a50-621b64f30adf"

Mostrando ítems 1-20 de 70

    • closedAccess   A parallel solver for huge dense linear systems  

      Badía, José; Movilla, Jose L.; Climente, Juan I.; Castillo Catalán, María Isabel; Marqués-Andrés, Mercedes; Mayo, Rafael; Quintana-Orti, Enrique S.; Planelles, Josep Elsevier (2011-11)
      HDSS (Huge Dense Linear System Solver) is a Fortran Application Programming Interface (API) to facilitate the parallel solution of very large dense systems to scientists and engineers. The API makes use of parallelism to ...

    • openAccess   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 ...

    • openAccess   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 ...

    • closedAccess   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 ...

    • openAccess   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 ...

    • openAccess   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 ...

    • openAccess   Biexcitons in CdSe nanoplatelets: geometry, binding energy and radiative rate 

      Macias-Pinilla, David F.; Planelles, Josep; Climente, Juan I. Royal Society of Chemistry (2022-05-13)
      Biexciton properties in semiconductor nanostructures are highly sensitive to quantum confinement, relative electron–hole masses, dielectric environment and Coulomb correlations. Here we present a variational Quantum Monte ...

    • openAccess   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 ...

    • openAccess   Changing spin and orbital ground state symmetries in colloidal nanoplatelets with magnetic fields 

      Llusar, Jordi; Climente, Juan I. Wiley (2022-04-01)
      The symmetry of the electronic ground state is of paramount importance in determining the magnetic, optical and electrical properties of semiconductor nanostructures. Here it is shown theoretically that non-trivial spin ...

    • openAccess   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 ...

    • 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   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 ...

    • closedAccess   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 ...

    • openAccess   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 ...

    • openAccess   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 ...

    • openAccess   Coulomb interaction signatures in self-assembled lateral quantum dot molecules 

      Zhou, Xinran R.; Lee, Jihoon H.; Salamo, Gregory J.; Royo, Miquel; Climente, Juan I.; Doty, Matthew F. American Physical Society (2013)
      We use photoluminescence spectroscopy to investigate the ground state of single self-assembled InGaAs lateral quantum dot molecules. We apply a voltage along the growth direction that allows us to control the total ...

    • openAccess   Diamagnetic and paramagnetic shifts in self-assembled InAs lateral quantum dot molecules 

      Zhou, Xinran R.; Royo Valls, Miguel; Liu, Weiwen; Lee, Jihoon H.; Salamo, Gregory J.; Climente, Juan I.; Doty, Matthew F. American Physical Society (2015)
      We uncover the underlying physics that explains the energy shifts of discrete states of individual InAs lateral quantum dot molecules (LQDMs) as a function of magnetic fields applied in the Faraday geometry. We observe that ...

    • openAccess   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 ...

    • openAccess   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 ...

    • closedAccess   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 ...