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<div class="" style="word-wrap:break-word">Dear all,
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<div class="">I know there have been loads of posts about this topic before and I looked through them for the past 2 weeks.</div>
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<div class="">In the course of my PhD (which I just started) I am looking at band gap tuning in graphene. So I just benchmarked graphene (cutoff energy, k-point,</div>
<div class="">optimisation of lattice parameter etc) and now attempt to calculate the band structure.</div>
<div class="">However, I constantly obtain a band gap when I should see the characteristic Dirac point in K. So I checked if I use enough vacuum space, enough k-points, how the pseudopotential influences the band structure, which unit cell/lattice vectors quantum
espresso is using so that I give the high symmetry points in the correct positions (I tried different positions for the high symmetry points) and also used the k-point path generator of xcrysden (the k-point path obtained with that is used in the input files
I attached).</div>
<div class="">I should mention that I use the following script for the generation of band structures and have successfully used it before on Au(111) surfaces:</div>
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<div class=""><a href="http://www.tcm.phy.cam.ac.uk/~jry20/bands.html" class="">http://www.tcm.phy.cam.ac.uk/~jry20/bands.html</a></div>
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<div class="">As already mentioned, please find my latest in and output files as well as the script and README file for the script I am using to generate band structures with quantum espresso in the following shared dropbox folder:</div>
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<div><a href="https://www.dropbox.com/sh/gtq8djtsew5h573/AABTzcqWMJ5iR9UMiTzEDFUYa?dl=0" class="">https://www.dropbox.com/sh/gtq8djtsew5h573/AABTzcqWMJ5iR9UMiTzEDFUYa?dl=0</a></div>
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<div class="">Best wishes,</div>
<div class="">Mariana Hildebrand.</div>
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