Optoelectronics

• Multi-QWs
  Intersubband transitions in InGaAs/AlInAs multiple quantum well systems
• QCSE
  Quantum Confined Stark Effect
• pn
  pn-junction
• bulk GaN
  k.p dispersion in bulk unstrained, compressively and tensilely strained GaN (wurtzite)
• GaN/AlGaN QW
  k.p dispersion of an unstrained GaN QW embedded between strained AlGaN layers
• Absorption in QWs
  Optical absorption of an InGaAs quantum well
• Interband
  Optical interband transitions in a quantum well - Matrix elements and selection rules
• Intraband transitions
  Optical intersubband transitions in a quantum well - Intraband matrix elements and selection rules
• Superlattices
  Dispersion in infinite superlattices: Minibands
• type-II heterostructures
  InAs / GaSb broken gap quantum well (BGQW)
  InAs / In_0.4Ga_0.6Sb superlattice dispersion with 8x8 k.p
  (type-II band alignment)
• QWRs / CEO
  Electron and hole wavefunctions in a T-shaped quantum wire grown by CEO (2D)
  (cleaved edge overgrowth)
  Electron and hole wavefunctions in a T-shaped strained quantum wire grown by CEO (2D)
  Cleaved edge overgrowth quantum dots (CEO QDs) (3D)
• Lifetime
  Scattering times for electrons in unbiased and biased single and multiple quantum wells
• Nanowires
  Energy dispersion of a cylindrically shaped GaN nanowire (2D)
  Exciton correction in quantum wires (2D)
• Magnetic field
  Fock-Darwin states of a 2D parabolic potential in a magnetic field (2D)
  Vertically coupled quantum wires in a longitudinal magnetic field (2D)

• Nanocrystals (spherical quantum dots)
• Energy levels in idealistic 3D cubic and cuboidal shaped quantum dots
• Exciton and biexciton correction in idealistic 3D cubic quantum dots
• Energy levels in a pyramidal shaped InAs/GaAs quantum dot including strain and piezoelectric fields
• Hexagonal shaped GaN quantum dot embedded in AlN (wurtzite)

InGaAs Laser Diode

What you can learn:

• drift-diffusion current based on quantum density, pn junction, quaternaries, emission spectrum
• self-consistent Schrödinger-Poisson-Current equation in 1D

Band gap of strained AlGaInP on GaAs substrate

What you can learn:

• alloys, linearly graded alloys, bowing, strain, band gaps
• strain equation

GaN/AlN wurtzite structure: Strain, piezo and pyroelectric charges in wurtzite

What you can learn:

• wurtzite, strain, piezoelectricity, pyroelectricity
• strain equation, Poisson equation

1. Schrödinger equation of a two-dimensional core-shell structure
2. Hexagonal 2DEG - Two-dimensional electron gas in a delta-doped hexagonal shaped GaAs/AlGaAs nanowire heterostructure

What you can learn:

• 2D simulations, circular and hexagonal quantum confinement, core-shell nanowires, sweep over alloy concentrations and core radius, interband transitions (spatial overlap matrix elements)
• Schrödinger equation in 2D, self-consistent Schrödinger-Poisson equation in 2D

Energy levels in a pyramidal shaped InAs/GaAs quantum dot including strain and piezoelectric fields

What you can learn:

• 3D simulation, quantum dot, strain, piezoelectric fields
• Strain equation, Poisson equation, Schrödinger equation in 3D

Growth of layers on strained (or stressed) substrates (biaxial and uniaxial)

What you can learn:

• uniaxial and biaxial strain, stress
• strain equation

InAs / GaSb broken gap quantum well (BGQW) (type-II band alignment)

What you can learn:

• 1D simulation, 8-band k·p, broken gap, type-II band alignment
• 8-band k·p equation

Optical absorption of a quantum well - Diploma thesis documentation available

What you can learn:

• 8-band k·p, optical absorption
• 8-band k·p equation