Frequently Asked Questions (FAQ)

• 1. FAQ - General
  • 1.1. Copyright Statement
  • 1.2. Are there any video tutorials available?
  • 1.3. Hardware requirements for nextnano? I want to buy a new computer. What shall I buy?
  • 1.4. How shall I cite the nextnano software in publications?
• 2. FAQ - Simulation
  • 2.1. nextnano Product related
    • Which features have been implemented recently?
    • What is the difference between nextnano³ and nextnano++?
    • Can I convert nextnano³ input files into nextnano++ input files?
    • How can I track how much memory is used during the simulations?
    • Can I pass additional command line arguments to the executable?
    • How can I speed up my calculations with respect to CPU time?
    • Can I take advantage of parallelization of the nextnano software on multi-core CPUs?
    • Dirichlet vs. Neumann boundary conditions
    • Quasi-Fermi level
    • I don’t understand the \(\mathbf{k} \cdot \mathbf{p}\) parameters
    • Can I add new materials to the database?
  • 2.2. GUI nextnanomat related
    • How do I produce 1D slices through the 2D plots in the GUI?
    • Is there a way to produce a 1D (or 2D) plot of some result, for example the probability density with the conduction band edge superimposed?
    • In other words, can the GUI show multiple plots at once?
    • What is the difference between “List view” and “Tree view”?
• 3. FAQ - Licensing
  • 3.1. Which types of licenses exist?
  • 3.2. How many people can use the software simultaneously?
  • 3.3. Which license do I need for Cluster computing
• 4. FAQ - Error messages and handling
  • 4.1. Where to find simulation LOG file
  • 4.2. How to add additional debug information to the LOG file
  • 4.3. ERROR when loading input file “File format is not valid”
  • 4.4. Error while starting simulation (“The specified executable is not a valid application for this OS platform.”)
  • 4.5. No Dirichlet points for Fermi levels found
  • 4.6. Quantum-Current-Poisson fails to converge