12771
Tuning the Fermi energy of the graphene layer to 0 . 85 eV enables strong control of its optical conductivity at telecom wavelengths , which allows modulation of cavity reflection in excess of 10 dB for a swing voltage of only 1 . 5 V .
 Chemical: graphene
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