2. nextnano++

The nextnano++ tool is a Schrödinger-Poisson-current solver and simulates quantum wells, quantum wires, quantum dots, … The nextnano++ tool (written in C++) is the successor of the nextnano³ code (written in Fortran).

Features of nextnano++ include:

• includes group IV materials (Si, Ge, SiGe) and all III-V materials, its ternaries and quaternaries;

• the nitrides are available in the zinc blende and wurtzite crystal structure

• flexible structures and geometries (1D, 2D and 3D)

• fully quantum mechanical electronic structure, based on the 8-band $\mathbf{k}\cdot \mathbf{p}$ model

• strain, piezo- and pyroelectric charges

• growth directions along [001], [011], [111], [211], … in short along any crystallographic direction

• equilibrium and non-equilibrium, calculation of current close to equilibrium (semi-classical)

• magnetic fields

This tool is documented in following sections:

• 2.1. Overview
  • Running
  • Input file
  • Output
  • Examples
  • Material database
• 2.2. Models
  • Crystal coordinate systems
  • Introduction to strain calculation
  • Piezoelectricity in wurtzite
  • Electrostatic potential
  • Charge densities
  • Doping
  • Incomplete ionization
  • Carrier transport
  • Generation and recombination rates
  • Mobility
  • Hamiltonian: 8-band model for zincblende
  • Interface Hamiltonian 8-band Zinc-Blende
  • Optical spectra
  • Optoelectronic characterization
• 2.3. Material Database
  • Introduction to Material Database
  • Defining New Materials
  • Interpolation Schemes
  • Default Materials and Alloys
  • Definition of Band Offsets (zincblende)
• 2.4. Tutorials
  • Introduction
  • Basics
  • p-n Junctions & Solar Cells
  • Light-Emitting Diodes
  • Quantum Mechanics
  • Quantum Wells
  • Quantum Wires
  • Quantum Dots
  • Electronic Band Structures
  • Superlattices
  • Cascade Structures
  • Optical Spectra and Transitions
  • 2-Dimensional Electron Gases (2DEGs)
  • Transmission and Conductance (CBR method)
  • Transistors
  • Magnetic Effects
  • Numerics
  • Tricks and Hacks
• 2.5. Art Simulations
  • Christmas HEMT (2021/12)
• 2.6. Keywords
  • postprocessor{ }
  • import{ }
  • output{ }
  • run{ }
  • global{ }
  • impurities{ }
  • contacts{ }
  • structure{ }
  • grid{ }
  • classical{ }
  • strain{ }
  • poisson{ }
  • currents{ }
  • quantum{ }
  • optics{ }
  • database{ }
• 2.7. Input Syntax
  • General
  • Variables
  • Comments
  • Conditional Statements
  • Data section
  • Operators and functions
  • Debug statements
  • Groups and attributes
  • XML Tags
  • Additional Examples and Remarks
• 2.8. Simulation Output
  • Basic information
  • Diagnostic information and error handling with log file
  • Visualization - VTK and AVS
• 2.9. Command Line
• 2.10. Maximizing Performance
• 2.11. Release Notes
  • 1.24.x.a (2025-04-04)
  • 1.22.18.b (2024-12-18)
  • 1.20.8.b (2024-08-22)
  • 1.19.61.a (2024-06-28)
  • 1.19.49.a (2024-06-17)
  • 1.19.22.a (2024-05-14)
  • 1.19.17.a (2024-04-28)
  • 1.18.63.b (2024-03-24)
  • 1.17.20 (2023-08-07)
  • 1.14.33 (2023-05-12)
  • 1.13.0 (2023-02-19)
  • 1.12.35 (2022-12-17)
  • 1.10.19 (2022-08-09)
  • 1.9.92 (2022-06-08)
  • EARLIER
• 2.12. FAQs
  • Features and Functionalities
  • Error Messages

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Last update: 25/10/2024