Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $Z_2$ topology of bismuth   While first-principles calculations with different levels of sophistication
predict a topologically trivial $Z_2$ state for bulk bismuth, some
photoemission experiments show surface states consistent with the
interpretation of bismuth being in a topologically non-trivial $Z_2$ state. We
resolve this contradiction between theory and experiment by showing, based on
quasiparticle self-consistent $GW$ calculations, that the experimental surface
states interpreted as supporting a non-trivial phase are actually consistent
with a trivial $Z_2$ invariant. We identify this contradiction as the result of
a crosstalk effect arising from the extreme penetration depth of the surface
states into the bulk of Bi. A film of Bi can be considered bulk-like only for
thicknesses of about 1000 bilayers ($\approx$ 400 nm) and more.

20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn