implement patch, trimer and trimer chain potential shapes.

code/finite_well.ipynb

code/kwant_chain.py

code/modules/.ipynb_checkpoints/diamond_chain-checkpoint.py

code/modules/diamond_chain.py

code/modules/potentials.py

code/patches_forHelene.ipynb

code/potentials_chain.py

code/testing_ground.py

notes/Plan_Diamond_chain.pdf

notes/diamond_chain.pptx