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Our simple device demonstrates the feasibility of high - contrast , low - power , and frequency - selective electro - optic modulators in graphene - integrated silicon photonic integrated circuits .
 Chemical: graphene; Chemical: silicon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: graphene; Chemical: silicon