<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>hello<br data-mce-bogus="1"></div><div>i want to calculate dielectric constant of few layer graphene with apply of electric field(saw-tooth potential).is every body to help me?<br data-mce-bogus="1"></div></div></body></html>