<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>i want to apply external electric field (saw-tooth like potential)to few layer graphene.do every body have examples for it?<br data-mce-bogus="1"></div><div>please help me<br data-mce-bogus="1"></div></div></body></html>