Dear Bipul Can you try passivating the bottom side of the slab using pseudohydrogens? You can read about this on many internet resources. Also I am sending the link of one article where the authors have used Gaussian broadening. http://journals.aps.org/prb/abstract/10.1103/PhysRevB.67.035403 Hope this helps.
Thanks & regards Manjusha Research Scholar IIT Kanpur India
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