Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topologically Protected Helical States in Minimally Twisted Bilayer
  Graphene   In minimally twisted bilayer graphene, a moir{\'e} pattern consisting of AB
and BA stacking regions separated by domain walls forms. These domain walls are
predicted to support counterpropogating topologically protected helical (TPH)
edge states when the AB and BA regions are gapped. We fabricate designer
moir{\'e} crystals with wavelengths longer than 50 nm and demonstrate the
emergence of TPH states on the domain wall network by scanning tunneling
spectroscopy measurements. We observe a double-line profile of the TPH states
on the domain walls, only occurring when the AB and BA regions are gapped. Our
results demonstrate a practical and flexible method for TPH state network
construction.

23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc