Tutorials

On this website, you can download a selection of our tutorial input files, namely

• Double quantum well
• Triangular quantum well
• Quantum well (Interband transitions)
• Schottky barrier
• pn junction
• Cascade Solar Cell
• Schrödinger-Poisson
• HEMT
• Inverted HEMT
• Si/SiGe MODQW
• AlGaInP on GaAs
• Capacitance-Voltage (MIS)
• Wurtzite
• AlGaN/GaN FET
• InGaAs multiple quantum well
• Core-shell nanowires
• Quantum dot molecule
• Quantum dot (pyramid)
• Spherical Si Quantum Dot (Artificial Atom)
• Laser Diode (InGaAs)
• Ultrathin-body Double Gate FET - DG MOSFET
• Strained substrate
• Dispersion in infinite superlattices: Minibands (Kronig-Penney model)
• Broken gap quantum well
• Optical absorption
• Tight-binding (sp3s*)

If you need input files not listed here, please contact stefan.birner [at] nextnano.com.

Complete list of all tutorials

Double quantum well

What you can learn:

• Energy levels and wave functions of a double quantum well as a function of quantum well separation (barrier width)
• Schrödinger equation
• Template feature of nextnanomat

Input files for: 1D / nextnano++, nextnano³ / Date: 2018-06-25

Triangular well

What you can learn:

• Energy levels and wave functions of a triangular quantum well
• Schrödinger equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2016-09-22

Optical interband transitions in a quantum well - Matrix elements and selection rules

What you can learn:

• Energy levels and wave functions of an infinite and finite quantum well, interband transition matrix elements (spatial wave function overlap), selection rules
• Schrödinger equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2018-06-25

Schottky Barrier

What you can learn:

• Metal-semiconductor interface: Fermi-level pinning; Ohmic contact vs. Schottky contact vs. Surface charge density vs. Surface doping
• Poisson equation

Input files for: 1D, 2D / nextnano++, nextnano³ / Date: 2016-07-20

Example 1: GaAs pn junction (forward bias)

What you can learn:

• doping
• Poisson equation
• apply a bias, drift-diffusion calculation, recombination
• Current-Poisson equation

Input files for: 1D, 2D, 3D / nextnano++, nextnano³ / Date: 2019-05-09

Cascade Solar Cell (Tandem Solar Cell)

What you can learn:

• pn junction, heterostructure, doping
• strain equation, Poisson equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2016-07-20

Schrödinger-Poisson - A comparison to the tutorial file of Greg Snider's code (AlGaAs/GaAs HEMT)

What you can learn:

• heterostructure, doping, 2DEG, AlGaAs/GaAs, user-defined function for the doping profile
• self-consistent Schrödinger-Poisson equation

Input files for: 1D, 2D / nextnano³ / Date: 2017-05-30

InGaAs/AlInAs HEMT structure (High Electron Mobility Transistor)

What you can learn:

• heterostructure, doping, 2DEG, InGaAs/AlInAs
• strain equation, self-consistent Schrödinger-Poisson equation

Input files for: 1D, 2D, 3D / nextnano++, nextnano³ / Date: 2016-07-20

AlGaAs/GaAs inverted HEMT structure (High Electron Mobility Transistor) - no online documentation available

What you can learn:

• heterostructure, doping, 2DEG, AlGaAs/GaAs, variables in input file
• self-consistent Schrödinger-Poisson equation

Input files for: 1D / nextnano³ / Date: 2016-07-20

Si/SiGe MODQW (Modulation Doped Quantum Well)

What you can learn:

• heterostructure, doping, 2DEG, Si/SiGe, strain, Delta band edge
• strain equation, self-consistent Schrödinger-Poisson equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2016-07-20

Band gap of strained AlGaInP on GaAs substrate

What you can learn:

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

Input files for: 1D / nextnano++ / nextnano³ / Date: 2016-10-25

Capacitance-Voltage curve of a “metal”-insulator-semiconductor (MIS) structure

What you can learn:

• apply a bias
• self-consistent Schrödinger-Poisson equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2017-07-03

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

What you can learn:

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

Input files for: 1D / nextnano++, nextnano³ / Date: 2018-10-17

- Two-dimensional electron gas in an AlGaN/GaN field effect transistor (FET)
   (nextnano++ tutorial)
- Two-dimensional electron gas in an AlGaN/GaN field effect transistor (FET)
   (nextnano³ tutorial)

What you can learn:

• wurtzite, strain, piezoelectricity, pyroelectricity, electron energy levels and wave functions, 2DEG, variables in input file
• strain equation, self-consistent Schrödinger-Poisson equation

Input files for: 1D, 2D / nextnano++, nextnano³ / Date: 2019-04-18

Intersubband transitions in InGaAs/AlInAs multiple quantum well systems

What you can learn:

• single-band effective mass vs. 8-band k·p, InGaAs/AlInAs
• self-consistent Schrödinger-Poisson equation, 8-band k·p Schrödinger equation

Input files for: 1D / nextnano++, nextnano³ / Date: 2018-09-18

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

Input files for: 2D / nextnano++, nextnano³ / Date: 2016-07-20

Quantum dot molecule

What you can learn:

• 3D simulation, quantum dot, applying an electric field, performing an electric field sweep
• Schrödinger equation in 3D

Input files for: 3D / nextnano++, nextnano³ / Date: 2016-07-20

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

Input files for: 3D / nextnano++, nextnano³ / Date: 2016-07-20

Hole energy levels of an "artificial atom" - Spherical Si Quantum Dot (6-band k.p)

What you can learn:

• 3D simulation, quantum dot, spin-orbit splitting, artificial atom
• 6-band k.p Schrödinger equation in 3D

Input files for: 3D / nextnano++, nextnano³ / Date: 2017-01-27

InGaAs Laser Diode - no online documentation available

What you can learn:

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

Input files for: 1D / nextnano++ / Date: 2017-07-03

Double Gate MOSFET (Metal Oxide Semiconductor Field Effect Transistor)

What you can learn:

• 2D and 3D simulations, drift-diffusion, mobility models
• self-consistent Current-Poisson equation in 2D and 3D

Input files for: 2D / nextnano++, nextnano³ / Date: 2019-03-08

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

What you can learn:

• uniaxial and biaxial strain, stress
• strain equation

Input files for: 1D / nextnano³ / Date: 2016-07-20

Dispersion in infinite superlattices: Minibands (Kronig-Penney model)

What you can learn:

• Schrödinger equation in 1D with periodic boundary conditions
• superlattice dispersion
• band structure of an artificial crystal (quantum well crystal)

Input files for: 1D / nextnano++, nextnano³ / Date: 2017-11-30

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

Input files for: 1D / nextnano++, nextnano³ / Date: 2019-11-21

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

Input files for: 1D / nextnano++ / Date: 2019-03-08

Empirical tight-binding (sp³s^*) band structure of GaAs, GaP, AlAs, InAs, C (diamond) and Si

What you can learn:

• tight-binding band structure of bulk semiconductors

Input files for: nextnano³ / Date: 2019-02-27

(for 2015-08-18 version of nextnano)

(for updates of nextnano)