Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Klein tunneling of the electronic states in the gate voltage modulated
  skyrmion crystal   As a result of the Hund's coupling, the band structure of the conducting
electrons in the skyrmion crystal (SkX) shares similar topological properties
with that of graphene, such as its cone-like shape, nonzero band Chern number,
edge states, and etc. In this work, we rigorously demonstrate that the Klein
tunneling phenomena is also shared by these two. We use the Green's function
technique and calculated the transmission probability of the electrons
tunneling through an electrostatic barrier in the SkX expressed by the double
exchange model. Numerical results of the SkX reproduced the Dirac model
obtained by linear fitting the two-dimensional band structure of the SkX.

3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
19
The categories of this paper are: eess
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The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom