Does the word literature has capital letter?
The sentence is
"In the field of literature"

Question

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So in your sentence it would be 'in the field of literature' without a capital letter.

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Not normally, no. For example:

I really like literature.
I love French literature.
Make sure you read the literature.

The only time you would capitalise literature is if it is a proper noun e.g. the name of a degree.

I have a degree in English Literature.

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In that sentence, no. Only if literature is part of the name of something: "I am taking English Literature this semester"

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*have