Sir I want to ask that when so ever I offer prayer behind emam just like in esha prayer so in first 2 rakat I remain silent because emam is reciting srah fatiha loudly but in second 2 rakat after attayat emam is in silent so we should recite sureh fatiha or not

Assalamu alaikum,

Islam Question and Answer - Reciting a soorah after al-Faatihah is not obligatory (http://www.islam-qa.com/en/ref/6422/surah fatiha in second rakah)