Visualitza QFA_Articles per autoria "1d710bd6-53b0-4209-88a1-b849973ef67d"
Ara mostrant els elements 21-40 d 62
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Effect of interface alloying and band-alignment on the Auger recombination of heteronanocrystals
Planelles, Josep; Movilla, Jose L.; Climente, Juan I. American Institute of Physics (AIP) (2012)We report a numerical study of the effect of interface alloying and band alignment on the Auger recombination processes of core/shell nanocrystals. Smooth interfaces are found to suppress Auger recombination, the strength ... -
Effect of strain and variable mass on the formation of antibonding hole ground states in InAs quantum dot molecules
Planelles, Josep; Climente, Juan I.; Rajadell Viciano, Fernando; Doty, Matthew F.; Bracker, Allan S.; Gammon, Daniel American Physical Society (2010-10-04)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 ... -
Electronic Origin of Linearly Polarized Emission in CdSe/CdS Dot-in-Rod Heterostructures
Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I. American Chemical Society (2016-11)Seeded CdSe/CdS nanorods exhibit intense polarized emission along the rod main axis. The degree of linear polarization cannot be explained by dielectric effects alone; an additional electronic contribution is present whose ... -
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, ... -
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 ... -
Emission State Structure and Linewidth Broadening Mechanisms in Type-II CdSe/CdTe Core–Crown Nanoplatelets: A Combined Theoretical–Single Nanocrystal Optical Study
Steinmetz, Violette; Climente, Juan I.; Pandya, Raj; Planelles, Josep; Margaillan, Florent; Puttisong, Yuttapoom; Dufour, Marion; Ithurria, Sandrine; Sharma, Ashish; Lakhwani, Girish; LEGRAND, Laurent; Bernardot, Frédérick; TESTELIN, Christophe; Chamarro, Maria; Chin, Alex W.; Rao, Akshay; Barisien, Thierry American Chemical Society (2020-07-10)Type-II heterostructures are key elementary components in optoelectronic, photovoltaic, and quantum devices. The staggered band alignment of materials leads to the stabilization of indirect excitons (IXs), i.e., correlated ... -
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 ... -
Excitonic Resonance in Semiconductor–Metal Nanohybrids
Climente, Juan I.; Movilla, Jose L.; Goldoni, Guido; Planelles, Josep ACS (2011-07)We use a configuration interaction approach within the envelope function approximation to study the nature of the excitonic resonance in nanohybrids, composite nanoparticles (NPs) combining a semiconducting and a metallic ... -
Excitons in core-only, core-shell and core-crown CdSe nanoplatelets: Interplay between in-plane electron-hole correlation, spatial confinement, and dielectric confinement
Rajadell Viciano, Fernando; Climente, Juan I.; Planelles, Josep American Physical Society (2017)Using semianalytical models we calculate the energy, effective Bohr radius, and radiative lifetime of neutral excitons confined in CdSe colloidal nanoplatelets (NPLs). The excitonic properties are largely governed by ... -
Excitons in metal halide perovskite nanoplatelets: an effective mass description of polaronic, dielectric and quantum confinement effects
Movilla, Jose L.; Planelles, Josep; Climente, Juan I. Royal Society of Chemistry (2023)A theoretical model for excitons confined in metal halide perovskite nanoplatelets is presented. The model accounts for quantum confinement, dielectric confinement, short and long range polaron interactions by means of ... -
Excitons, Biexcitons, and Trions in CdSe Nanorods
Rajadell Viciano, Fernando; Climente, Juan I.; Planelles, Josep; Bertoni, Andrea American Chemical Society (2009)We calculate the recombination energies and probabilities of neutral excitons (X), singly charged excitons (X±), and biexcitons (XX) in CdSe quantum dots of variable length. For spherical dots the relative position of the ... -
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 ... -
Generalized method of image dyons for quasi-two dimensional slabs with ordinary - topological insulator interfaces
Movilla, Jose L.; Climente, Juan I.; Planelles, Josep Elsevier (2023-06-16)Electrostatic charges near the interface between topological (TI) and ordinary (OI) insulators induce magnetic fields in the medium that can be described through the so-called method of image dyons (electric charge - ... -
Hole Band Mixing in CdS and CdSe Quantum Dots and Quantum Rods
Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I. American Chemical Society (2010)Using a six-band k·p Hamiltonian for wurtzite lattice, we study the hole ground state symmetry and composition in spherical quantum dots and elongated quantum rods made of CdS and CdSe. The ground state crossovers which ... -
Hole spin relaxation in InAS/GaAs quantum dot molecules
Segarra, Carlos; Climente, Juan I.; Rajadell Viciano, Fernando; Planelles, Josep IOP Publishing Ltd (2015-09)We calculate the spin–orbit induced hole spin relaxation between Zeeman sublevels of vertically stacked InAs quantum dots. The widely used Luttinger–Kohn Hamiltonian, which considers coupling of heavy- and light-holes, ... -
Influence of Polytypism on the Electronic Structure of CdSe/CdS and CdSe/CdSe Core/Shell Nanocrystals
Segarra, Carlos; Rajadell Viciano, Fernando; Climente, Juan I.; Planelles, Josep American Chemical Society (2017-03)We address theoretically differences and similarities on the electronic structure of CdSe/CdS dot-in-dot nanocrystals (NCs) with wurtzite/wurtzite (WZ/WZ), zinc-blende/zinc-blende (ZB/ZB) and polytype ZB/WZ crystalline ... -
Isospin phases of vertically coupled double quantum rings under the influence
Planelles, Josep; Pi, Martí; Barranco, Manuel; Malet, Francesc; Royo Valls, Miguel American Physical Society (2008)Vertically coupled double quantum rings submitted to a perpendicular magnetic field B are addressed within the local spin-density-functional theory. We describe the structure of quantum ring molecules containing up to 40 ... -
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. ... -
Magnetic field implementation in multiband k⋅p Hamiltonians of holes in semiconductor heterostructures
Planelles, Josep; Climente, Juan I. IOP Publishing (2013) -
Magnetic modulation of the tunneling between defects states in antidot superlattices
Movilla, Jose L.; Planelles, Josep IOP Publishing (2012)We show theoretically that the tunnelling between properly designed defects in periodic antidot lattices can be strongly modulated by applied magnetic fields. Further, transport channels made up of linear arrangements of ...