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<p>Then one of the 3 acustic branches ( probably the one you gave
problems with ) should be flat. <br>
</p>
<p>I don't know how this phononpy works, maybe there is a way to
deal directly with 2D systems, otherwise just find a way to set to
0 all the interatomic force constants that correspond to
interactions between atoms staying in different periodic images of
the slab.</p>
<p><br>
</p>
<p>pietro <br>
</p>
<br>
<br>
<div class="moz-cite-prefix">On 05/12/2016 09:33, Mohammed Ghadiyali
wrote:<br>
</div>
<blockquote
cite="mid:BN6PR06MB3042981603DD5690DB6E983ECD830@BN6PR06MB3042.namprd06.prod.outlook.com"
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<p>Hi,</p>
<p><br>
</p>
<p>The structure is two dimensional similar to bi-layer
graphene. </p>
<p><br>
</p>
<p>Regards,</p>
<p><br>
</p>
<p>Ghadiyali Mohammed Kader</p>
<p><br>
</p>
<p>Research Scholar</p>
<p><br>
</p>
<p>University of Mumbai.</p>
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