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Preface | |
Acknowledgements | |
About the author | |
About the book | |
Introduction | |
Semiconductors and heterostructures | |
The mechanics of waves | |
Crystal structure | |
The effective mass approximation | |
Band theory | |
Heterojunctions | |
Heterostructures | |
The envelope function approximation | |
The reciprocal lattice | |
Solutions to Schrödinger's equation | |
The infinite well | |
In-plane dispersion | |
Density of states | |
Subband populations | |
Finite well with constant mass | |
Effective mass mismatch at heterojunctions | |
The infinite barrier height and mass limits | |
Hermiticity and the kinetic energy operator | |
Alternative kinetic energy operators | |
Extension to multiple-well systems | |
The asymmetric single quantum well | |
Addition of an electric field | |
The infinite superlattice | |
The single barrier | |
The double barrier | |
Extension to include electric field | |
Magnetic fields and Landau quantisation | |
In summary | |
Numerical solutions | |
Shooting method | |
Generalised initial conditions | |
Practical implementation of the shooting method | |
Heterojunction boundary conditions | |
The parabolic potential well | |
The Pöschl-Teller potential hole | |
Convergence tests | |
Extension to variable effective mass | |
The double quantum well | |
Multiple quantum wells and finite superlattices | |
Addition of electric field | |
Quantum confined Stark effect | |
Field-induced anti-crossings | |
Symmetry and selection rules | |
The Heisenberg uncertainty principle | |
Extension to include band non-parabolicity | |
Poisson's equation | |
Self-consistent Schrödinger-Poisson solution | |
Computational implementation | |
Modulation doping | |
The high-electron-mobility transistor | |
Band filling | |
Diffusion | |
Introduction | |
Theory | |
Boundary conditions | |
Convergence tests | |
Constant diffusion coefficients | |
Concentration dependent diffusion coefficient | |
Depth dependent diffusion coefficient | |
Time dependent diffusion coefficient | |
!-doped quantum wells | |
Extension to higher dimensions | |
Impurities | |
Donors and acceptors in bulk material | |
Binding energy in a heterostructure | |
Two-dimensional trial wave function | |
Three-dimensional trial wave function | |
Variable-symmetry trial wave function | |
Inclusion of a central cell correction | |
Special considerations for acceptors | |
Effective mass and dielectric mismatch | |
Band non-parabolicity | |
Excited states | |
Application to spin-flip Raman spectroscopy | |
Alternative approach to excited impurity states | |
The ground state | |
Position dependence | |
Excited States | |
Impurity occupancy statistics | |
Excitons | |
Excitons in bulk | |
Excitons in heterostructures | |
Exciton binding energies | |
1s exciton | |
The two-dimensional and three-dimensional limits | |
Excitons in single quantum wells | |
Excitons in multiple quantum wells | |
Stark Ladders | |
Self-consistent effects | |
Spontaneous symmetry breaking | |
2s exciton | |
Strained quantum wells, V. D. Jovanovíc | |
Stress and strain in bulk crystals | |
Strain in quantum wells | |
Strain balancing | |
Effect on the band profile of quantum wells | |
The piezoelectric effect | |
Induced piezoelectric fields in quantum wells | |
Effect of piezoelectric fields on quantum wells | |
Simple models of quantum wires and dots | |
Further confinement | |
Schrödinger's equation in quantum wires | |
Infinitely deep rectangular wires | |
Simple approximation to a finite rectangular wire | |
Circular cross-section wire | |
Quantum boxes | |
Spherical quantum dots | |
Non-zero angular momentum states | |
Approaches to pyramidal dots | |
Matrix approaches | |
Finite difference expansions | |
Density of states | |
Quantum dots, M. Califano | |
0-dimensional systems and their experimental realisation | |
Cuboidal dots | |
Dots of arbitrary shape | |
Application to real problems | |
A more complex model is not always a better model | |
Carrier scattering | |
Fermi's Golden Rule | |
Phonons | |
Longitudinal optic phonon scattering of bulk carriers | |
LO phonon scattering of two-dimensional carriers | |
Application to conduction subbands | |
Averaging over carrier distributions | |
Ratio of emission to absorption | |
Screening of the LO phonon interaction | |
Acoustic deformation potential scattering | |
Application to conduction subbands | |
Optical deformation potential scattering | |
Confined and interface phonon modes | |
Carrier-carrier scattering | |
Addition of screening | |
Averaging over an initial state population | |
Intrasubband versus intersubband | |
Thermalised distributions | |
Auger-type intersubband processes | |
Asymmetric intrasubband processes | |
Empirical relationships | |
Carrier-photon scattering | |
Carrier scattering in quantum wires and dots | |
Electron transport | |
Introduction | |
Mid-infrared quantum cascade lasers | |
Realistic quantum cascade laser | |
Rate equations | |
Self-consistent solution of the rate equations | |
Calculation of the current density | |
Phonon and carrier-carrier scattering transport | |
Electron temperature | |
Calculation of the gain | |
QCLs, QWIPs, QDIPs and other methods | |
Optical properties of quantum wells, D. Indjin | |
Intersubband absorption in quantum wells | |
Bound-bound transitions | |
Bound-free transitions | |
Fermi level | |
Rectangular quantum well | |
Intersubband optical non-linearities | |
Electric polarisation | |
Intersubband second harmonic generation | |
Maximization of resonant susceptibility | |
Optical waveguides, C. A. Evans | |
Introduction to optical waveguides | |
Optical waveguide analysis | |
Optical properties of materials | |
Application to waveguides of laser devices | |
Multiband envelope function (k.p) method, Z. Ikoníc | |
Symmetry, basis states and band structure | |
Valence band structure and the 6 × 6 Hamiltonian | |
4 × 4 valence band Hamiltonian | |
Complex band structure | |
Block-diagonalisation of the Hamiltonian | |
The valence band in strained cubic semiconductors | |
Hole subbands in heterostructures | |
Valence band offset | |
The layer (transfer matrix) method | |
Quantum well subbands | |
The influence of strain | |
Strained quantum well subbands | |
Direct numerical methods | |
Empirical pseudopotential theory | |
Principles and Approximations | |
Elemental Band Structure Calculation | |
Spin-orbit coupling | |
Compound Semiconductors | |
Charge densities | |
Calculating the effective mass | |
Alloys | |
Atomic form factors | |
Generalisation to a large basis | |
Spin-orbit coupling within the large basis approach | |
Computational implementation | |
Deducing the parameters and application | |
Isoelectronic impurities in bulk | |
The electronic structure around point defects | |
Microscopic electronic properties of heterostructures | |
The superlattice unit cell | |
Application of large basis method to superlattices | |
Comparison with envelope-function approximation | |
In-plane dispersion | |
Interface coordination | |
Strain-layered superlattices | |
The superlattice as a perturbation | |
Application to GaAs/AlAs superlattices | |
Inclusion of remote bands | |
The valence band | |
Computational effort | |
Superlattice dispersion and the interminiband laser | |
Addition of electric field | |
Application to quantum wires and dots | |
Recent progress | |
The quantum-wire unit cell | |
Confined states | |
V-grooved quantum wires | |
Along-axis dispersion | |
Tiny quantum dots | |
Pyramidal quantum dots | |
Transport through dot arrays | |
Anti-wires and anti-dots | |
Concluding Remarks | |
Materials parameters | |
References | |
Topic Index | |
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