Do you know a basic reference to introduce an undergraduate student with more physical rather than mathematical background to De Rham cohomology?
The Student (from a Bachelors program in material science) should work on a summer project aiming to understand some of the mathematics behind the quantum hall efect, explained with chern numbers. The student has previously helped on experiments with some materials relevant to the quantum hall efect.
I do know the mathematical ellaborations on this ranging von Bellisard, Schulz-Baldes, collaborators and Connes'approach on the topic in the noncommutative geometry book. This will be certanily too advanced from the point of view of mathematics.