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quanshengwu / wannier_tools

WannierTools: An open-source software package for novel topological materials. Full documentation:
http://www.wanniertools.org
GNU General Public License v3.0
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Query about Topological invariants in 2D materials #67

Open arnmaj opened 4 years ago

arnmaj commented 4 years ago

Dear Dr. Wu,

I am a postdoctoral researcher at Uppsala University, Sweden, and have been using Wanniertools for a project. I am very new to the field of topological insulators, etc.

However, I have a question. I was studying an allotrope of graphene. So, I generated the TB parameters using Wannier90 and plotted the band structure using Wanniertools. It matched identically with my standard PBE calculations, both showing identical Dirac cones. But, when I am trying to calculate Z2 and Chern number, they are both coming to 1 for k3=0.0 and k3=0.5 while for the other planes its 0.

This is not possible as it can either be a Chern insulator or topological. Am I correct? How can I solve this problem?

Is there any special tag I need to use to 2D? because in the manual its written Z2 and Chern number for 3D. Really looking forward to a solution. Please let me know if any other information is needed from me.

Best Regards, Arnab

anoopmd05 commented 4 years ago

could you brief me, how you actually installed this software? I could only install the prerequisites...