Formulation and grammar.

Hello . I am writing a letter of motivation to a summerschool in England.
I am trying to say that that i think the topic it is about is interesting (statistical physics). How do I express that in a good way? Under is the start of the paragraph about this. Is that a grammatically correct way of saying that? I feel that something is wrong with this sentence when i read it.

"The main reason why I want to apply for the summer school in mathematics this year is because I find the topic to be very interesting"

thank you.