When is dowry (Haq-Meh'r) farz?

Assalam-0-Alaikum, I want to know **(with references to authentic sources)** that is the dowry amount (Haq-Meh'r) still payable to bride if the couple only did the Nikkah (then the bride went to another country) and they didn't live together for even one night and didn't even consummated the marriage and then they got divorced? I have heard that dowry is not applicable until the bride spends the night with the groom. Is this true?