layout of igraph

Dear R users, 

I am trying to draw a network using igraph package. I intend to place the
hub nodes (the ones with the relatively more connection with other nodes) in
the center of the graph.  Also, the graph need to be in the fashion that the
higher the correlation between two nodes is , the closer the two nodes will
be.  Is there any layout that can help or any other way to do this?  

Thanks in advance. 
Shukai

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