Listar por autoría "88694efd-397f-4218-8a50-621b64f30adf"
Mostrando ítems 21-40 de 70
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Directed emission of CdSe nanoplatelets originating from strongly anisotropic 2D electronic structure
Scott, Riccardo; Heckmann, Jan; Prudnikau, Anatol V.; Antanovich, Artsiom; Mikhailov, Aleksandr; Owschimikow, Nina; Artemyev, Mikhail V.; Climente, Juan I.; Woggon, Ulrike; Grosse, Nicolai B.; Achtstein, Alexander W. Nature Publishing Group (2017)ntrinsically directional light emitters are potentially important for applications in photonics including lasing and energy-efficient display technology. Here, we propose a new route to overcome intrinsic efficiency ... -
Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k‑Space Spectroscopy
Heckmann, Jan; Scott, Riccardo; Prudnikau, Anatol V.; Antanovich, Artsiom; Owschimikow, Nina; Artemyev, Mikhail V.; Climente, Juan I.; Woggon, Ulrike; Grosse, Nicolai B.; Achtstein, Alexander W. American Chemical Society (2017)We show that two-photon absorption (TPA) is highly anisotropic in CdSe nanoplatelets, thus promoting them as a new class of directional two-photon absorbers with large cross sections. Comparing two-dimensional k-space ... -
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 ... -
Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission
Dabard, Corentin; Guilloux, Victor; Gréboval, Charlie; Po, Hong; Makke, Lina; FU, Ningyuan; Xu, Xiang Zhen; Silly, Mathieu G.; Patriarche, Gilles; lhuillier, emmanuel; Barisien, Thierry; Climente, Juan I.; Diroll, Benjamin T.; Ithurria, Sandrine Springer Nature (2022)Nanocrystals (NCs) are now established building blocks for optoelectronics and their use as down converters for large gamut displays has been their first mass market. NC integration relies on a combination of green and red ... -
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 ... -
Electronic Structure and Optical Spectrum of Thick HgTe Colloidal Nanoplatelets
Climente, Juan I.; Szafran, Bartłomiej American Chemical Society (2023-10-18)The electronic structure and optical transitions of HgTe nanoplatelets (NPLs) are calculated by means of an 8-band k·p Hamiltonian. We show that, for NPL thickness between the limits of strong confinement (∼1 nm) and that ... -
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 ... -
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 - ... -
Highly Charged Excitons and Biexcitons in Type-II Core/Crown Colloidal Nanoplatelets
Llusar, Jordi; Climente, Juan I. American Chemical Society (2022-04-28)The optoelectronic properties of type-II CdSe/CdTe colloidal nanoplatelets (NPLs) charged with neutral excitons (X0) have been intensively investigated in the last years. Motivated by the recent experimental progress, here ... -
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 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 ...