Navegando Teses e dissertações por assunto "Quantum dots"

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    • Platforms based on semiconductors for application in quantum computing 

      Cunha, Iann (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 02/06/2023)
      This thesis is composed of three parts. In the first part, a study of transport in semiconductor nanowires is carried out, in which the multichannel scattering occurs in a certain finite region, providing a reentrance in ...

    • Polarização de spin em heteroestruturas semicondutoras contendo pontos quânticos de InAs 

      Santos, Ednilson Carlos dos (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 07/05/2010)
      In this work, we have studied spin polarization of carriers in a resonant tunneling diode GaAs/AlGaAs with InAs quantum dots in the center of the quantum well. We have observed that the photoluminescence of quantum dots ...

    • Propriedades de sistemas de pontos quânticos semicondutores acoplados e sua resposta óptica 

      Cabral, Luís Antônio (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 31/10/2017)
      The study of doped semiconductor quantum dots with magnetic impurities has been a challenging task when adding spin-orbit coupling and exchange interaction with asymmetry effects. The combination of all these factors within ...

    • Efeito da modulação da topologia do confinamento em sistemas quase zero-dimensionais induzida por campo elétrico 

      Oliveira, Edson Rafael Cardozo de (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 01/04/2015)
      Quantum dots grown by epitaxial techniques for optical and transport studies are usually capped by a layer of the same material on which the QDs were grown. Recently, several studies have shown how the growth parameters ...

    • Magneto luminescência em diodos de tunelamento ressonante contendo pontos quânticos de InAs 

      Nóbrega, Jaldair Araújo e (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 15/03/2011)
      In this work, we have studied the spin polarization of carriers in n-type resonant tunneling diodes (RTDs) of GaAs/AlGaAs which incorporates a single layer of InAs selfassembled quantum dots in the center of the GaAs quantum ...

    • Optimal quantum control applied to quantum dots 

      Ruiz, Carlos Mario Rivera (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 03/10/2019)
      In the present study, we review the one-qubit dynamics and we offer a new unifying interpretation of the Landau-Zenner and the Rabi dynamics, by indicating the physical elements responsible for the manifestation of one ...

    • Carrier dynamics of low-dimensional semiconductors: from quantum wells and quantum dots to resonant tunneling devices 

      Naranjo Lopez, Andrea (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 22/07/2021)
      This thesis aims to study heterostructures and devices that play a fundamental role in modern nanoelectronic technologies, focusing on group III-V semiconductor materials, especially arsenide-based systems, for photodetection ...