23299
The bandgap opens in the GALs with ( n - m ) mod3 = 0 but remains closed in those with ( n - m ) mod3 = +/- 1 , reminiscent of the gap - chirality rule in carbon nanotubes .
 Chemical: carbon
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: carbon