Valyte

Valyte is a comprehensive CLI tool for VASP workflows, providing both pre-processing and post-processing capabilities with a focus on clean, publication-quality outputs and modern aesthetics.

Features

Pre-processing

• Supercell Creation: Generate supercells from POSCAR files.
• Interactive K-Point Generation: Create KPOINTS files with automatic grid calculation based on K-spacing.
• Band KPOINTS Generation: Automatic high-symmetry path detection for band structure calculations.

Post-processing

• DOS Plotting:
  • Smart Plotting: Automatically handles total DOS and Projected DOS (PDOS).
  • Orbital-Resolved: Plots individual orbitals (s, p, d, f) by default.
  • Adaptive Legend: Intelligently hides the legend if PDOS contributions are low.
  • Gradient Fill: Aesthetically pleasing gradient fills for DOS peaks.
• Band Structure Plotting:
  • VBM alignment to 0 eV.
  • Color-coded bands (Purple for VB, Teal for CB).
  • High-symmetry path labels from KPOINTS.
• Publication Quality: Clean aesthetics, custom fonts (Arial, Helvetica, Times New Roman), high DPI output.

Installation

Install Valyte directly from PyPI:

pip install valyte

Or install from source:

git clone https://github.com/nikyadav002/Valyte-Project
cd Valyte-Project
pip install -e .

Examples

Updating Valyte

To update to the latest version:

pip install --upgrade valyte

Usage

The main command is valyte.

Click to view detailed usage instructions

🧊 Create Supercell

Generate a supercell from a POSCAR file:

valyte supercell nx ny nz [options]

Example:

# Create a 2×2×2 supercell
valyte supercell 2 2 2

# Specify input and output files
valyte supercell 3 3 1 -i POSCAR_primitive -o POSCAR_3x3x1

Options:

• -i, --input: Input POSCAR file (default: POSCAR).
• -o, --output: Output filename (default: POSCAR_supercell).

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📉 Band Structure

1. Generate KPOINTS

Automatically generate a KPOINTS file with high-symmetry paths for band structure calculations.

valyte band kpt-gen [options]

Options:

• -i, --input: Input POSCAR file (default: POSCAR).
• -n, --npoints: Points per segment (default: 40).
• -o, --output: Output filename (default: KPOINTS).

Example:

valyte band kpt-gen -n 60 -i POSCAR_relaxed -o KPOINTS_band

🕸️ Generate K-Points (Interactive)

Generate a KPOINTS file for SCF calculations interactively.

valyte kpt

This command will prompt you for:

1. K-Mesh Scheme: Monkhorst-Pack or Gamma.
2. K-Spacing: Value in $2\pi/\AA$ (e.g., 0.04).

It automatically calculates the optimal grid based on your POSCAR structure.

2. Plot Band Structure

Plot the electronic band structure from vasprun.xml.

valyte band [options]

Options:

• --vasprun: Path to vasprun.xml (default: current directory).
• --kpoints: Path to KPOINTS file for path labels (default: looks for KPOINTS in same dir).
• --ylim: Energy range, e.g., --ylim -4 4.
• -o, --output: Output filename (default: valyte_band.png).

Example:

valyte band --ylim -3 3 -o my_bands.png

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📊 Plot DOS

valyte dos [path/to/vasprun.xml] [options]

You can provide the path as a positional argument, use the --vasprun flag, or omit it to use the current directory.

Examples:

# Plot all orbitals for all elements (Default)
valyte dos

# Plot specific elements (Total PDOS)
valyte dos -e Fe O

# Plot specific orbitals
valyte dos -e "Fe(d)" "O(p)"

# Plot mixed (Fe Total and Fe d-orbital)
valyte dos -e Fe "Fe(d)"

Options:

• -e, --elements: Specific elements or orbitals to plot.
  • Example: -e Fe O (Plots Total PDOS for Fe and O).
  • Example: -e Fe(d) O(p) (Plots Fe d-orbital and O p-orbital).
  • Example: -e Fe Fe(d) (Plots Fe Total and Fe d-orbital).
• --xlim: Energy range (default: -6 6).
• --ylim: DOS range (e.g., --ylim 0 10).
• --scale: Scaling factor for Y-axis (e.g., --scale 3 divides DOS by 3).
• --fermi: Draw a dashed line at the Fermi level (E=0). Default is OFF.
• --pdos: Plot only Projected DOS (hide Total DOS).
• --legend-cutoff: Threshold for legend visibility (default: 0.10 = 10%).
• -o, --output: Output filename (default: valyte_dos.png).
• --font: Font family (default: Arial).

Example:

valyte dos ./vasp_data --xlim -5 5 -o my_dos.png