Exciton quasiparticles : theory, dynamics, and applications / Randy M. Bergin, editor.

Format:

Book

Contributor:

Bergin, Randy M.

Series:

Physics Research and Technology

Physics research and technology

Language:

English

Subjects (All):

Exciton theory.

Quasiparticles (Physics).

Physical Description:

1 online resource (425 p.)

Edition:

1st ed.

Place of Publication:

New York : Nova Science Publishers, c2011.

Language Note:

English

Summary:

Exciton can be regarded as an elementary excitation of condensed matter which can transport energy without transporting net electric charge. This book presents research in the study of exciton quasiparticles, including exciton polariton dispersion in multinary compounds; exciton relaxation dynamics in colloidal core and core/shell CdSe nanorods; solitons and excitons in seismotectonic problems; exciton diffusion length measured by surface photovoltage method; and excitons in CdO parabolic quantum dots.

Contents:

Intro

EXCITON QUASIPARTICLES: THEORY, DYNAMICS AND APPLICATIONS

CONTENTS

PREFACE

Chapter 1 EXCITON POLARITON DISPERSION IN MULTINARY COMPOUNDS

ABSTRACT

1. STRONG AND WEAK POLARITON EFFECTS IN THE REGION OF EXCITON RESONANCES IN MULTINARY COMPOUNDS

2. EXCITON SPECTRA IN CRYSTALS WITH STRONG POLARITON EFFECT (ωLT &gt

&gt

Γ)

2.1. Intraband and Interband Relaxation of Exciton Polaritons. Determination of Parameters of Polariton Disperssion

2.2. Spectral-Spatial Diffusion of Polaritons

2.3. Relative Contribution to the Emission of Upper and Lower Polariton Branches

3. BREWSTER EFFECTS IN EXCITON REFLECTIVITY SPECTRA

3.1. Brewster Effect in the Model of the "Dead" Layer

3.2. Approximation of Normal Incidence at the Layer-Crystal Interface

3.3. Brewster Effect in the Amplitude and Phase Spectra of Exciton Reflectivity in ZnP2 Crystals

4. EXCITON SPECTRA IN CRYSTALS WITH WEAK POLARITON EFFECT (ωLT ≤ Γ)

4.1. Free Exciton Spectra in CuGaS2 Crystals

4.2. Free Exciton Spectra in CuAlS2 Crystals

4.3. Free Exciton Spectra in CuGaSe2 Crystals

4.4. Free Exciton Spectra in CuAlSe2 Crystals

5. POLARITON MODES AT OBLIQUE INCIDENCE OF THE LIGHT ON THE CRYSTAL SURFACE

5.1. The Effective Index of Refraction

5.2. Calculated Reflectivity Spectra of CdS

5.3. Spectra of Oblique Reflectance in Crystals with Weak Polariton Effect ( ωLT &lt

)

5.4. Interference of Additional Waves in the Case of Weak Exciton Polaritons

5.5. Interference in Luminescence Spectra of Exciton Polaritons

6. EXCITON-PHONON LUMINESCENCE SPECTRA WITH EXCITON-POLARITON ANNIHILATION

6.1. Energy Exchange between the Upper and Lower Modes of Polariton Branches

7. BOUND EXCITONS IN MULTINARY COMPOUNDS.

7.1. Resonance Impurity Emission in CuGaS2 Crystals

8. WAVELENGTH MODULATED EXCITON REFLECTIVITY SPECTRA IN CUALSE2 CRYSTALS

8.1. Calculation of the Contour of Wavelength Modulated Reflectivity Spectra in the Case of Weak Polariton Effect

9. RESONANCE RAMAN SCATTERING AND OPTICAL ORIENTATION OF EXCITONS IN СUGAXAL1-XS2 CRYSTALS

10. RESONANCE RAMAN SCATTERING IN CUGAXIN1-XS2 SOLID SOLUTIONS

CONCLUDING REMARKS

REFERENCES

Chapter 2 EXCITON RELAXATION DYNAMICS IN COLLOIDAL CORE AND CORE/SHELL CDSE NANORODS

1. INTRODUCTION

1.a. Colloidal Nanocrystals

1.b. Core/Shell Nanostructures

1.c. Exciton Relaxation Processes

2. EXPERIMENTAL

2.a. Samples: Core and Core/Shell Nanorods

2.b. Theoretical Model

2.c. Spectroscopic Methods

3. EXCITON RELAXATION PROCESSES: ROLE OF SURFACE AND INTERFACE DEFECT STATES

3.a. Differential Transmission Spectra

3.b. Bleaching Dynamics

3.b.1. Intraband relaxation

3.b.2. Trapping mechanism

3.b.3. Auger processes

3.c. Stimulated Emission and Photo-Absorption Processes

3.c.1. Core sample

3.c.2. Core/shell sample

4. SHELL THICKNESS EFFECTS ON DEFECT STATES DISTRIBUTION

4.a. Differential Transmission Spectra

4.b. Bleaching Dynamics

4.c. Stimulated Emission and Photo-Absorption Processes

5. ROLE OF THE SHELL THICKNESS ON EXCITON EMISSION PROCESS

5.a. Experimental Results

5.b. Discussion

6. EXCITON RELAXATION PROCESSES AT RESONANT PUMP ENERGY

6.a Differential Transmission Spectra

6.b. Bleaching Dynamics

6.b.1. Role of defect states on Auger processes and competition with SE

6.b.2. Confined acoustic phonons

7. CONCLUSION

ACKNOWLEDGMENTS

Chapter 3 RADIATION-ASSISTED PREPARATION OF POWDER MATERIALS AND THEIR EXCITON LUMINESCENCE

ABSTRACT.

1. INTRODUCTION - EXCITON LUMINESCENCE IN NANOPOWDERS

2. PREPARATION OF NANOPOWDER MATERIALS USING IONIZING AND UV RADIATION

3. PREPARATION OF ZNO BASED MATERIALS USING RADIATION METHODS

3.1. Preparation Methods Using Visible Light, Ultraviolet and Ionizing Radiation

3.2. Preparation and Excitonic Luminescence of Powder ZnO Prepared under UV-VIS and Ionizing Radiation

Irradiation of solutions and characterization of solid phase

Luminescence properties

4. PREPARATION OF YAG BASED MATERIALS WITH EXCITON LUMINESCENCE

4.1. Preparation and Excitonic Luminescence of Powder YAG Prepared under UV-VIS and Ionizing Radiation

5. CONCLUSION

ACKNOWLEDGMENT

6. REFERENCES

Chapter 4 THE SEMICLASSICAL MOLECULAR EXCITON: PATH/TIME ORDERED PROPAGATORS VS. STOCHASTIC DYNAMICS

INTRODUCTION - THE TRANSITION DENSITY AND SECOND QUANTIZATION

THEORY

A. The Exciton Propagator

B. The Gauge-Theoretic Picture

DISCUSSION

A. Loop Theory vs. Platt's Ring Theory, M.O. Theory

B. The Keldysh Contour and the Argument Principle

CONCLUSION

APPENDIX

Chapter 5 SOLITONS AND EXITONS IN SEISMOTECTONIC PROBLEMS

INTRODUCTION

PROBLEM FORMULATION

PROBLEM SOLUTION

ACTION-AT-A-DISTANCE OF THE ROTATION ELASTIC FIELD

EARTHQUAKE MIGRATION

CONCLUSIONS

ACNOWLEDGMENTS

Chapter 6 EXCITON DYNAMICS STUDY OF InAs/GaAs QUANTUM DOT HETEROSTRUCTURES

EXPERIMENTS

RESULTS AND DISCUSSION

Chapter 7 EXCITON DIFFUSION LENGTH IN TITANYL PHTHALOCYANINE THIN FILMS AS DETERMINED BY THE SURFACE PHOTOVOLTAGE METHOD

PRINCIPLES OF THE SURFACE PHOTOVOLTAGE METHOD

EXPERIMENT

Preparation of the Layers.

The Transmittance and Reflectance Spectra Measurements Optimized for Thin Films

Surface Photovoltage Spectra

RESULTS

Chapter 8 ACCURACY OF THE COHERENT POTENTIAL APPROXIMATION FOR FRENKEL EXCITONS IN ONE-DIMENSIONAL ARRAYS WITH GAUSSIAN DIAGONAL DISORDER AND NEAREST-NEIGHBOR TRANSFER

MACROSCOPIC DISORDER AND THE COHERENT POTENTIAL APPROXIMATION

Chapter9EXCITONFANORESONANCEINSEMICONDUCTORHETEROSTRUCTURESANDITSRELATEDPHENOMENA

Abstract

1.Introduction

2.TheoreticalFramework

2.1.AdiabaticExpansion

2.2.R-MatrixPropagation

2.3.TimeDelay

3.ExcitonicFRinSemiconductorHeterostructures

3.1.LinearExcitonicFR

3.1.1.QWs

3.1.2.WSLs

3.2.Non-LinearExcitonicFR

3.2.1.Introduction

3.2.2.Theory

3.2.3.AnalyticModelwithoutCoulombExchange

3.2.4.SBEResultswithCoulombExchange

3.3.DynamicExcitonicFR

3.3.1.Introduction

3.3.2.Formulation

3.3.3.DynamicEX-FRSpectra

4.RelatedPhenomenaofDynamicFR

4.1.DynamicFRinDynamicWannier-StarkLadder

4.1.1.Introduction

4.1.2.R-MatrixFloquetTheory

4.1.3.PonderomotiveInteractions

4.1.4.ExcessDOS

4.2.DynamicFRinCoherentPhononGeneration

5.Conclusion

Acknowledgments

References

Chapter10MAGNETOEXCITONBINDINGENERGYINPOLARCRYSTALS,QUANTUMWELLSANDGRAPHENEBILAYERS

2.MagnetoexcitonsinPolarSemiconductors

2.1.BulkMagnetoexcitons

2.2.Quantum-wellMagnetoexcitons

3.MagnetoexcitonDispersioninGrapheneBilayersEmbeddedinaDielectric

3.1.RelativisticBethe-SalpeterEquation

4.Conclusion

Chapter11WANNIER-MOTT-FRENKELHYBRIDEXCITONINSEMICONDUCTOR-ORGANICSYSTEMSCONTAININGQUANTUMDOTS

2.SemiconductorQuantumDotArrayinanOrganicMedium.

2.1.TotalHamiltonianoftheSystem

2.2.TheHybridExcitonState

2.3.NonlinearOpticalResponse

3.HybridExcitonStateinaQuantumDot-DendriteSystem

3.1.AQuantumDot-DendriteModel

3.2.EffectiveInteractionCoefficientsBetweenDendrimerGenerations

3.3.DiagramTechniquesforGreenFunctioninOrbitalRepresentation

3.4.TheQuantumDot-DendronLigand

4.HybridExcitonunderElectricandMagneticFields

Short Communication EXCITONS IN CDO PARABOLIC QUANTUM DOTS

2. THEORY

3. CONCLUSION

INDEX.

Notes:

Description based upon print version of record.

Includes bibliographical references and index.

Description based on print version record; title from PDF title page, viewed (08/05/2020).

ISBN:

1-61209-040-0

OCLC:

777548842