<div dir="ltr"><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Dear Giuseppe</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">I really appreciate your response but unfolding the BS of supercell was not my problem as</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">I have installed BandUP and tried to unfold but i faced few problems.</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">1. I put the high symmetry K-path points(from seek-path website suitable for R3m symmetry) and unfolded but the band structures are completely different for FCC unit cell and my supercell(1x1x2)</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">2. I used the FCC high symmetry path which gives me similar band structure as of unit cell but one impurity band above the bandgap so Is this method correct or whether i should go for 576 atoms supercell(4x4x4) and then calculate EBS for supercell</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">@ dear Stefano <br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"> I couldn't understand your purpose behind this "if “energy bands” makes any </pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">sense in the presence of impurities..." Could you be so kind to elaborate?</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Thanks </pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Priya</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">IITB,India</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">This being said, I doubt that the very concept if “energy bands” makes any
sense in the presence of impurities... SB</pre><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">--
Stefano Baroni, Trieste -- swift message written and sent on the go
> On 28 Sep 2018, at 10:46, Giuseppe Mattioli <<a href="mailto:giuseppe.matti...@ism.cnr.it">giuseppe.matti...@ism.cnr.it</a>>
> wrote:
>
>
> Dear Priya
>
> Google is a good starting point for solving general-purpose problems:
> Supercells fold the unit cell band structure and make it difficult to compare
> with undoped band structures. If you type "unfolding supercell band
> structure" you find a lot of interesting tutorials. This one (among many
> other) might be useful to you
>
> <a rel="nofollow" href="https://www.ifm.liu.se/theomod/compphys/band-unfolding/" style="color:rgb(160,30,30)">https://www.ifm.liu.se/theomod/compphys/band-unfolding/</a>
>
> HTH
> Giuseppe
>
> Priya Shrivastava <<a href="mailto:priyashrivastav...@gmail.com">priyashrivastav...@gmail.com</a>> ha scritto:
>
>> Dear all ,
>>
>> Please bear with me ( i m newbie) .I try to dope an fcc unit cell by making
>> supercell of 1x1x2. So the symmetry of supercell becomes R3m while unit
>> cell has fm-3m symmetry so is it correct that BZ would change for my
>> supercell and i can no longer use the k path that is provided for fcc unit
>> cell.
>>
>> if this is true what should i do because i would like to compare the band
>> structure of unitcell with supercell to see impurity effect.
>>
>> I tried to read kittel and several other things but i couldn't come to any
>> conclusion.please help.
>>
>> Thanks,
>> Priya
>
>
>
> GIUSEPPE MATTIOLI
> CNR - ISTITUTO DI STRUTTURA DELLA MATERIA
> Via Salaria Km 29,300 - C.P. 10
> I-00015 - Monterotondo Scalo (RM)
> Mob (*preferred*) +39 373 7305625
> Tel + 39 06 90672342 - Fax +39 06 90672316
> E-mail: <<a href="mailto:giuseppe.matti...@ism.cnr.it">giuseppe.matti...@ism.cnr.it</a>>
>
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