<div dir="ltr">Your system may be 2-d (eg. surface), but you are doing the calculations in a three dimensional space.<br>Therefore you get (2x3=) 6 phonon modes.<br><br><div class="gmail_quote">> I have confusion that in 2 dimension there should be only 4 optical phonons <div>
<br> For a 2-d system with 2 atoms per unit cell, there will be (2x2=) 4 phonon modes, out of which 2 should be acoustic and 2 optical.<br><br>Prasenjit.<br><br><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
and corresponding 4 no. of raman<br>
tensor matrices, but i am getting 6 tensors matrices.<br>
Please help me..<br>
Thanks,<br>
Arun<br>
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PhD Student<br>
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India<br>
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