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 Different Z2 Invariants with and without Band.dispersion 'on' Date: 2021/06/03 22:11 Name: Simba   Dear Taisuke Ozaki,I am getting different Z2 invariants with and without Band.dispersion 'on'. For Band.dispersion being on it is (1, 1, 0, o) while with including Band.dispersion and k-path it is (1, 0, 1, 1). Could you please explain why it is so? And one more thing, my system is 2D, then why I am getting these 2 and more Z2 invariants. What am I missing? Thank you
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 Re: Different Z2 Invariants with and without Band.dispersion 'on' ( No.1 ) Date: 2021/06/04 08:32 Name: T. Ozaki Hi, Could you show us your input file?Then, we may have a more chance to respond your question properly. Regards, TO Re: Different Z2 Invariants with and without Band.dispersion 'on' ( No.2 ) Date: 2021/06/04 17:11 Name: Simba  How should I share input files with you?Should I copy-paste here? There is no attachment option here? Re: Different Z2 Invariants with and without Band.dispersion 'on' ( No.3 ) Date: 2021/06/04 17:56 Name: Simba  Okay, I found the source of the error. There was a slight change in my atomic positions.I got the Z2= (1, 1, 0, 0) for both cases.But now my question is that if my system is 2D what does it mean by (1; 1, 0, 0)?If it was (1; 0, 0, 0) we say it is a strong topological Insulator and if it is (0; 0, 0, 1) we say it is weak TI in 3D while strong in 2D.But it is (1, 1, 0, 0), what do we call this one. In literature, it is only written Z2=1 (just single 1) which is also correct for 2D systems. But I am getting two 1. Please explain this and correct me if I am wrong?sincerelyThank you Re: Different Z2 Invariants with and without Band.dispersion 'on' ( No.4 ) Date: 2021/06/09 22:48 Name: T. Ozaki Hi, By the definition of Z2, (1; 1, 0, 0) implies x0=0, x_pi=1, y_0=1, y_pi=0, z_0=1, and z_pi=0. I guess that the k-path perpendicular to the 2D plane may not have physical meaning, but we see that Z2=1 appears along the other two directions, respectively. So, we may be able to call it strong topological Insulator. Regards, TO

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