• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
10.11606/D.76.2000.tde-19092013-110033
Document
Author
Full name
Fernando Graciano de Brito
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2000
Supervisor
Committee
Menezes, Jose Carlos Egues de (President)
Hai, Guo Qiang
Koiller, Belita
Title in Portuguese
Shot Noise dependente de spin em sistemas com tunelamento: modelo semiclássico
Keywords in Portuguese
Espalhamento dependente de spin
Flutuações de spin
Semicondutores magnéticos
Abstract in Portuguese
Neste trabalho investigamos pela primeira vez flutuações dependentes de spin em correntes eletrônicas polarizadas através de estruturas magnéticas. Nosso sistema físico consiste de uma heteroestrutura com tunelamento ressonante formada por um poço ou "ponto" quântico contendo Mn, confinado entre duas barreiras de potencial. Usamos um modelo semiclássico baseado em equações de taxa para calcular as ocupações dos estados ressonantes up e down. Estas equações são derivadas de uma equação mestra que descreve a probabilidade de ocupação dos estados de spin em um dado tempo. Funções correlação corrente-corrente são expressas em termos das funções correlação hop-hop (associadas à transições entre os níveis ressonantes up e down) e o shot noise dependente de spin é determinado em termos da matriz variância do sistema, também derivada da equação mestra. Quando consideramos um feixe polarizado e tempos distintos (τ ↑ ↓ ≠ τ ↓ ↑), podemos obter ambas "correlações positivas" (‹ Δ ↑ Δ ↓ › ≥ 0) e/ou "negativas" (‹ Δ ↑ Δ ↓ › ≤ 0) no nosso modelo. A generalização e reinterpretação do modelo de ilhas nos possibilitou (i) investigar flutuações dependentes de spin em correntes polarizadas; (ii) observar aumento e atenuação do shot noise; (iii) verificar que processos de "spin-flip" com (τ ↑ ↓ ≠ τ ↓ ↑) são relevantes na atenuação do shot noise e (iv) verificar que o ruído contém informações sobre o processo de "spin-flip"
Title in English
Spin-dependent shot noise in systems with scattering: semiclassical model
Keywords in English
Magnetic semiconductors
Spin-dependent fluctuations
Spin-dependent scattering
Abstract in English
In this work we investigate for the first time spin-dependent fluctuations in spin-polarized electronic currents through magnetic structures. Our physical model consists of a resonant-tunneling heterostructure formed by a Mn-based quantum well or "point", confined between a double-barrier potential. We used a semiclassical model based on rate equations to calculate the occupations of the spin-up and spindown resonant states. These equations are derived from a master equation describing the probability of occupation of the spin states at a given time. Current-current correlation functions are expressed in terms of hop-hop correlation functions (for hops between islands representing the up and down states) and the spin-dependent shoi noise is determined in terms of the variance matrix of the system; also derived from the master equation. When we consider a polarized beam and distinctive times (τ ↑ ↓ ≠ τ ↓ ↑), we can obtain both "positive correlations" (‹ Δ ↑ Δ ↓ › ≥ 0) and "negative correlations" (‹ Δ ↑ Δ ↓ › ≤ 0) in our model. The generalization and reinterpretation of the island model allowed us (i) to investigate spin-dependent fluctuations in spinpolarized electronic currents; (ii) to observe enhancement and suppression of shot noise; (iii) to verify that spin-flip processes with (τ ↑ ↓ ≠ τ ↓ ↑) are relevant to shotnoise suppression and (iv) to verify that noise contains information about spin-flip processes
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2013-10-11
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2022. All rights reserved.