Mapping a channel mixing bath to a Wilson chain

A versaltile mapping scheme starting from hybridization function, mapping a general multi-orbital non-interacting channel mixing bath to a Wilson chain model. The motivation is to transform the impurity problems to a real space chain, thus can be solved using NRG and VMPS.

To use this program

Please install the following numerical packages for python(pip install -r requirements.txt)

• numpy
• scipy
• matplotlib
• gmpy2(optional)

or Anaconda all in one pack: https://store.continuum.io/cshop/anaconda/

To run an example.

```
$ cd source/
$ python quickmap.py
```

Program will use the default configuration file 'config-sample.ini' as input. Also, you can specify your own configuration file by $ python quickmap.py <your-config>.ini. The input hybridization is specified by a data file('sample_hybridization_func.dat' above), it will be interpolated as a continuous function, thus choosing a good omega mesh(like a logarithmic one) is important.

Documentation

• Paper:

    Quantum impurities in channel mixing baths
    Jin-Guo Liu, Da Wang, and Qiang-Hua Wang
    Phys. Rev. B 93, 035102 – Published 4 January 2016
  
    Its Arxiv version: doc/1509.01461v2.pdf, doc/SupplMater.pdf
  

• Technical Details: doc/technical.pdf

• Program documentation: doc/program_manual.pdf

Information

• Author: Jinguo Leo, NanJing University.
• Date: 2015/09/07
• Contact: [email protected]