I had thought about this sometime ago but did not come up with the calculations on this problem, basically i did not get time to do that. Now i'm glad that some people have done this. See the following:
1. http://prb.aps.org/abstract/PRB/v80/i24/e245406
2. http://prb.aps.org/abstract/PRB/v82/i15/e155459
3. http://benasque.org/2011qfext/talks_contr/2021_Sernelius.pdf
4.http://arxiv.org/abs/1102.1757
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