Chern nubmer calculation

We implemented four kinds of methods to calculate Chern number for two dimenional disorder systems.

The details of methods are illustrated in the pdf file.

Simple useage:

Name		Name	Last commit message	Last commit date
Makefile		Makefile
README.md		README.md
calculate chern number using different method.pdf		calculate chern number using different method.pdf
chern.f90		chern.f90
chernrealspace.f90		chernrealspace.f90
detmatrix.f90		detmatrix.f90
disorder.f90		disorder.f90
eigen.f90		eigen.f90
ek_bulk.f90		ek_bulk.f90
ham_bulk.f90		ham_bulk.f90
ham_haldane.f90		ham_haldane.f90
ham_qlayer2qlayer.f90		ham_qlayer2qlayer.f90
ham_twist.f90		ham_twist.f90
input.dat		input.dat
inverse.f90		inverse.f90
main.f90		main.f90
mat_mul.f90		mat_mul.f90
module.f90		module.f90
readHmnR.f90		readHmnR.f90
readHmnR2.f90		readHmnR2.f90
readHmnR2bak.f90		readHmnR2bak.f90
readinput.f90		readinput.f90

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