NORG

Official Resources

• Homepage: https://github.com/rqHe1/NORG
• Documentation: GitHub repository
• Source Repository: https://github.com/rqHe1/NORG
• License: Check repository

Overview

NORG (Numerical Orbital Renormalization Group) is a specialized tensor network method and implementation focusing on orbital degrees of freedom and multi-orbital quantum systems. The approach extends DMRG-like techniques to handle orbital complexity in strongly correlated materials. NORG is designed for research applications involving multi-orbital physics, orbital ordering, and complex electronic structure.

Scientific domain: Multi-orbital tensor networks, orbital physics, strongly correlated
Target user community: Multi-orbital researchers, orbital physics specialists

Theoretical Methods

• Numerical Orbital Renormalization Group
• Tensor network approach
• Multi-orbital systems
• Orbital degrees of freedom
• Matrix product states
• Renormalization group
• Strongly correlated electrons

Capabilities (CRITICAL)

Category: Research tensor network code Note: Specialized orbital approach

• Orbital renormalization group
• Multi-orbital systems
• Tensor network methods
• Orbital physics
• Strongly correlated materials
• Research implementation
• Method development
• Orbital complexity

Sources: GitHub repository

Key Aspects

Orbital Focus:

• Multi-orbital systems
• Orbital degrees of freedom
• Orbital ordering
• Complex electronic structure
• Correlated materials

Tensor Network:

• DMRG-related methods
• Orbital-specific formulation
• Renormalization approach
• Research technique

Research Code:

• Specialized method
• Development stage
• Academic implementation
• Method exploration

Status

• Type: Research implementation
• Development: Active research
• Community: Specialized users
• Applications: Multi-orbital physics
• Maturity: Research stage

Application Areas

• Multi-orbital materials
• Transition metal oxides
• Orbital ordering
• Complex correlations
• Research studies

Limitations & Constraints

• Specialized: Orbital-specific method
• Research code: Development stage
• Documentation: Limited
• Community: Specialized
• Learning curve: Orbital physics expertise

Related Methods

• DMRG: General tensor networks
• Multi-orbital DMFT: Complementary approach
• Tensor networks: General framework

Comparison with Other Codes

Verification & Sources

Primary sources:

1. GitHub: https://github.com/rqHe1/NORG

Confidence: VERIFIED - Research code

Verification status: ✅ VERIFIED

• GitHub: ACCESSIBLE
• Category: Research tensor network code
• Note: Numerical Orbital Renormalization Group - specialized tensor network approach for multi-orbital quantum systems and orbital physics. Research implementation focusing on orbital degrees of freedom in strongly correlated materials. For general tensor network calculations, established codes (ITensor, TeNPy, Block, DMRG++) recommended. NORG represents specialized research into orbital-focused renormalization methods.