Our Products

nextnano++

nextnano++ forms the backbone of the nextnano++ package, a state-of-the-art program that enables solving the Schrödinger, Poisson, and Current equations self-consistently for arbitrary device designs. The algorithms incorporated in nextnano++ have been meticulously crafted to deliver dependable solutions, even for extreme designs under applied bias when used appropriately. As a result, nextnano++ facilitates modeling of systems in equilibrium and quasi-equilibrium states, providing accurate information on current densities, energy profiles, wavefunctions, and electronic band structures while considering the effects of strain, piezo- and pyroelectric charges, and magnetic fields. Additionally, nextnano++ can also compute various optical spectra or electron transport directly based on solutions obtained from the Schrödinger equation.

One of the key advantages of nextnano++ is its exceptional versatility, accommodating a wide range of materials, including group-IV semiconductors and all III-V and II-VI semiconductor binary compounds, as well as their ternaries, quaternaries, and quinternaries. The software supports both zincblende and wurtzite crystal symmetries and arbitrary structure geometries in 1D, 2D, and 3D, defined along any crystallographic direction. Moreover, the syntax of input files used by nextnano++ is continually evolving to keep pace with the increasingly complex demands of modern device design and analysis, while maintaining user-friendliness.

nextnano³

nextnano³, the predecessor of nextnano++, shares many similarities with its successor. It offers the same core functionality and design versatility as nextnano++, with the addition of materials such as graphene and electrolytes.

While nextnano³ is not as actively developed as nextnano++, it still offers unique functionalities not available in nextnano++. In fact, it’s often the first platform where new implementations are tested before being carefully integrated into nextnano++. For example, nextnano³ features the 30-band model for bulk crystals, tight-binding model, k.p interface model, and classical avalanche effect.

We recognize that some of our customers may still prefer nextnano³ as it provides a range of tutorials that are not available yet in nextnano++. However, we recommend using nextnano++ wherever possible as it benefits from ongoing development and improvements, which enhances its convergence stability and speed. Our customer support and consulting services prioritize nextnano++ as the primary tool. Furthermore, nextnano++ features a more user-friendly input file syntax, enhancing usability.

nextnano.MSB

Since 2021, nextnano.MSB has been integrated into nextnano++, enhancing user accessibility to its advanced capabilities.

This tool offers the Multi-Scattering Büttiker (MSB) probe model, a simplified version of the Non-Equilibrium Green’s Function (NEGF) method covering longitudinal polar-optical phonon scattering and acoustic phonon scattering.

Despite its simplified framework, the MSB model delivers realistic quantum transport calculation, as it contains the two most relevant scattering mechanisms. In comparison to the standard NEGF model, this tool is orders of magnitude more efficient while still accurately reproducing results obtained with the NEGF method. It is especially useful for modeling quantum transport in Resonant Tunneling Diodes (RTDs), where it produces current-voltage characteristics. Furthermore, for Quantum Cascade Lasers (QCLs), it computes optical gain spectra. However, our code has not undergone extensive testing for QCL simulations. Therefore, if you are interested in QCLs, we strongly recommend using the nextnano.NEGF software, where we have achieved excellent agreement between experimental data and theoretical predictions over many years of experience.

nextnanomat

nextnanomat is a user-friendly graphical interface, designed to simplify the simulation process and streamline your experience with our suite of tools.

With nextnanomat, users can easily visualize computed 1D, 2D, and 3D results, and run any nextnano tools, while maintaining an overview of generated output files.

This feature-rich tool also provides a versatile workflow manager, enabling users to edit input files in ASCII or XML formats, organize simulations, and submit jobs directly or via a batch list.

nextnanomat also supports parallel job execution on multi-core CPUs and cloud computing through the free HTCondor software. This allows for the efficient and flexible simulation of complex quantum devices, making it an indispensable tool for researchers and developers alike.

nextnanopy

nextnanopy is a Python package designed to automate and postprocess simulations withnextnano suite of software including nextnano++, nextnano³ and nextnano.NEGF.

With nextnanopy, users can easily run multiple simulations with varying parameters, plot publication-quality figures, calculate additional quantities using output data, and even define geometries in the input files based on importing GDSII files.

The nextnanopy package is maintained on Github as well as the Python Package Index (PyPI) repository, providing you with an accessible and comprehensive tool for automating and optimizing your nextnano simulations.