26802
Measurements of rotational - anisotropy SHG revealed that the current - induced SHG from the current - biased graphene / SiO2 / Si ( 001 ) structure undergoes a phase inversion as the measurement location on graphene is shifted laterally along the current flow direction .
 Chemical: graphene; Chemical: SiO2; Chemical: Si; 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; Chemical: SiO2; Chemical: Si; Chemical: graphene