[Pw_forum] Z2 Indes

[Riemann Derakhshan]

Dear all'

I'm calculating the Z2 Topological  Index for Bi2Se3 using Quantum Espresso
By means of  a  Z2-package.

Z2-package is a Post processing tool for computing the Z2 invariant using
the output of first-principles packages,

which Quantum Espresso application was developed by Davide Ceresoli.

After finishing calculation It gives this Message,

       The parity for the current TRS surface is:    -1.000
       The Z2 invariant for the current TRS surface is: -1

       [A. A. Soluyanov and D. Vanderbilt, Phys Rev B 83, 235401 (2011)]

I've checked the Subroutine "z2_c_phase.f90" which calculates the Z2 index
but I haven't  found any comment about the output of this subroutine.

So I've decided to ask my question from  Dear QE Users. I'll appreciate if
anyone can give me a guidance about this topic.

My question is : I want to know That does this message means  "system in in
Nontrivial Topological phase?"

-- 
PhD. student of Physics
Physics Department of Damghan University
Tel : +98 938 903 6759
P.O.Box:36716-41167
Damghan, Iran
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