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<p>Dear Surasree,</p>
<p>For computing the Chern number, you can use the
"z2pack.invariant.chern" function (<a moz-do-not-send="true"
href="https://z2pack.greschd.ch/en/latest/reference/invariant.html#z2pack.invariant.chern">https://z2pack.greschd.ch/en/latest/reference/invariant.html#z2pack.invariant.chern</a>)
instead of "z2pack.invariant.z2".</p>
<p>In terms of the surface used, you should use a surface that is
completely closed, as opposed to the Z2 calculation where it only
covers half the Brillouin zone.</p>
<p>So, for example: `lamba s, t: [0, s, t]`. The value of "X" in
your example can be freely chosen for Chern number calculations.
If the band structure has a direct gap everywhere the value should
be the same for all X, if there are band gap closures it can
change when crossing them.</p>
<p>Best regards,</p>
<p>Dominik<br>
</p>
<div class="moz-cite-prefix">On 02.04.21 09:50, Surasree Sadhukhan
wrote:<br>
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<blockquote type="cite"
cite="mid:CAPQT7yZqcMf-=ri8ZBK6D5LFgsag84sNuQCZHakqu96n173vzA@mail.gmail.com">
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<div>Is it like [1, s / 2, t] instead of [0.5, s / 2, t] for
chern number??</div>
<div>I want to say <br>
</div>
<div> [X, s / 2, t]</div>
<div>X=0.5 for z2-number</div>
<div>X=1.0 for Chern number.</div>
<div>Please let me know<br>
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<div dir="ltr"><span><font color="#888888">Thanks &
Regards
<div><br>
</div>
<div>Surasree Sadhukhan<br>
</div>
<div>Research Scholar</div>
<div>School Of Physical Sciences</div>
<div>IIT GOA</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Apr 2, 2021 at 1:15 PM
Surasree Sadhukhan <<a
href="mailto:surasree183212004@iitgoa.ac.in"
moz-do-not-send="true">surasree183212004@iitgoa.ac.in</a>>
wrote:<br>
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0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>Dear Sir,</div>
<div>Are there any extra tags to calculate the Chern number
of a system in Z2-pack software? I don't find any tags
related to chern number in run.py.<br>
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<div>
<div dir="ltr">
<div dir="ltr"><span><font color="#888888">Thanks
& Regards
<div><br>
</div>
<div>Surasree Sadhukhan<br>
</div>
<div>Research Scholar</div>
<div>School Of Physical Sciences</div>
<div>IIT GOA</div>
</font></span></div>
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