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

Mostrando ítems 41-60 de 70

    • openAccess   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, ...

    • openAccess   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 ...

    • 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. ...

    • closedAccess   Large-scale linear system solver using secondary storage: self-energy in hybrid nanostructures 

      Badía, José; Movilla, Jose L.; Climente, Juan I.; Castillo Catalán, María Isabel; Marqués-Andrés, Mercedes; Mayo, Rafael; Quintana-Orti, Enrique S.; Planelles, Josep Elsevier (2011-02)
      We present a Fortran library which can be used to solve large-scale dense linear systems, Ax=b. The library is based on the LU decomposition included in the parallel linear algebra library PLAPACK and on its out-of-core ...

    • openAccess   Magnetic field implementation in multiband k⋅p Hamiltonians of holes in semiconductor heterostructures 

      Planelles, Josep; Climente, Juan I. IOP Publishing (2013)

    • openAccess   Morphology and Band Structure of Orthorhombic PbS Nanoplatelets: An Indirect Band Gap Material 

      Macias-Pinilla, David F.; Echeverría-Arrondo, Carlos; Gualdrón Reyes, Andrés Fabián; Agouram, Said; Muñoz-Sanjosé, Vicente; Planelles, Josep; Mora-Sero, Ivan; Climente, Juan I. American Chemical Society (2021-01-12)
      PbS quantum dots and nanoplatelets (NPLs) are of enormous interest in the development of optoelectronic devices. However, some important aspects of their nature remain unclear. Recent studies have revealed that colloidal ...

    • openAccess   Nature and Control of Shakeup Processes in Colloidal Nanoplatelets 

      Llusar, Jordi; Climente, Juan I. American Chemical Society (2020-10-29)
      Recent experiments suggest that the photoluminescence line width of CdSe nanoplatelets (NPLs) and core/shell CdSe/CdS NPLs may be broadened by the presence of shakeup (SU) lines from negatively charged trions. We carry ...

    • closedAccess   One- and Two-Photon Absorption in CdS Nanodots and Wires: The Role of Dimensionality in the One- and Two-Photon Luminescence Excitation Spectrum 

      Achtstein, Alexander W.; Ballester Caudet, Ana; Movilla, Jose L.; Hennig, Jonas; Climente, Juan I.; Prudnikau, Anatol V.; Antanovich, Artsiom; Scott, Riccardo; Artemyev, Mikhail V.; Planelles, Josep; Woggon, Ulrike American Chemical Society (2014-12)
      We investigate the spectral dependence of the linear and two-photon absorption of wurtzite CdS nanoparticles (dots and rods) by means of quantitative one- and two-photon photoluminescence excitation spectroscopy and effective ...

    • openAccess   Optimized Cation Exchange for Mercury Chalcogenide 2D Nanoplatelets and Its Application for Alloys 

      Dabard, Corentin; Planelles, Josep; Po, Hong; Izquierdo, Eva; Makke, Lina; Gréboval, Charlie; Moghaddam, Nicolas; Khalili Lazarjani, Adrien; Dang Huu, Tung; Chu, Audrey; Pierini, Stefano; Abadie, Claire; Cavallo, Mariarosa; Bossavit, Erwan; Xu, XiangXiang Zhen; Hollander, Philippe; Silly, Mathieu; Lhuillier, Emmanuel; Climente, Juan I.; Ithurria, Sandrine American Chemical Society (2021-11-29)
      II–VI two-dimensional (2D) nanoplatelets (NPLs) exhibit the narrowest optical features among nanocrystals (NCs). This property remains true for Hg-based NPLs, despite a cation exchange procedure to obtain them from Cd-based ...

    • openAccess   Origin of electron spin-orbit anisotropy in pyramidal InAs quantum dots 

      Segarra, Carlos; Planelles, Josep; Climente, Juan I. Elsevier (2015)
      We investigate the electron spin–orbit interaction anisotropy of pyramidal InAs quantum dots using a fully three-dimensional Hamiltonian. The dependence of the spin–orbit interaction strength on the orientation of externally ...

    • openAccess   Origin of two-hole triplet splitting in circular quantum dots 

      Climente, Juan I. Elsevier (2012-05)
      Recent photoluminescence spectra of positively charged excitons in InAs/GaAs quantum dots have revealed the existence of large splittings between the View the MathML sourcep-shell triplet sublevels of holes. We provide an ...

    • openAccess   Photoluminescence spectroscopy of trions in quantum dots: A theoretical description 

      Goldoni, Guido; Bertoni, Andrea; Climente, Juan I. American Physical Society (2008)
      We present a full configuration-interaction study of the spontaneous recombination of neutral and singly charged excitons trions in semiconductor quantum dots from weak- to strong-coupling regimes. We find that the ...

    • openAccess   Piezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS Nanocrystals 

      Segarra, Carlos; Climente, Juan I.; Polovitsyn, Anatolii; Rajadell Viciano, Fernando; Moreels, Iwan; Planelles, Josep American Chemical Society (2016-05-25)
      Using multiband k·p calculations, we show that strain-engineered piezoelectricity is a powerful tool to modulate the electron−hole spatial separation in a wide class of wurtzite CdSe/CdS nanocrystals. The inherent ...

    • openAccess   Role of alternance symmetry in magnetoconductance 

      Planelles, Josep; Climente, Juan I. American Physical Society (2014)
      We show that the direction of coherent electron transport across a cyclic system of quantum dots or a cyclic molecule can be modulated by an external magnetic field if the cycle has an odd number of hopping sites, but the ...

    • openAccess   Role of thermally occupied hole states in room-temperature broadband gain in CdSe/CdS giant-shell nanocrystals 

      Tanghe, Ivo; Llusar, Jordi; Climente, Juan I.; Barker, Alex J.; Paternò, Giuseppe Maria; Scotognella, Francesco; Polovitsyn, Anatolii; Khan, Ali Hossain; hens, zeger; Van Thourhout, Dries; Geiregat, Pieter; Moreels, Iwan Wiley (2022)
      Growing CdSe/CdS nanocrystals from a large CdSe core, and employing a giant CdS shell, a continuous, broadband gain spectrum, covering the spectral range between the CdSe and the CdS band edge, is induced. As revealed by ...

    • openAccess   Scalable qubit architecture based on holes in quantum dot molecules 

      Economou, Sophia E.; Climente, Juan I.; Badolato, Antonio; Bracker, Allan S.; Gammon, Daniel; Doty, Matthew F. American Physical Society (2012)
      Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently controlled by optical pulses. There are, however, many challenges to developing a scalable multibit information ...

    • openAccess   Shell filling and paramagnetism in few-electron colloidal nanoplatelets 

      Llusar, Jordi; Climente, Juan I. American Physical Society (2022-08-05)
      Colloidal semiconductor nanoplatelets are excellent optical emitters, which combine a quasi-2D structure with strong in-plane Coulomb interactions. Here, we go beyond the photoexcitation regime and investigate theoretically ...

    • openAccess   Spin–orbit-induced hole spin relaxation in InAs and GaAs quantum dots 

      Climente, Juan I.; Segarra, Carlos; Planelles, Josep Institute of Physics (2013)
      We study the effect of valence band spin–orbit interactions (SOI) on the acoustic phonon-assisted spin relaxation of holes confined in quantum dots (QDs). Heavy hole–light hole (hh–lh) mixing and all the spin–orbit terms ...

    • openAccess   Strain in Lattice-Mismatched CdSe-Based Core/Shell Nanoplatelets 

      Llusar, Jordi; Planelles, Josep; Climente, Juan I. American Chemical Society (2019-08-05)
      We investigate the role of stress arising between core and shell materials in colloidal CdSe/X hetero-nanoplatelets (X = ZnS, CdS, CdTe). The resulting strain distribution is calculated within the linear elastic regime and ...

    • 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 ...