Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant effective damping of octupole oscillation in an antiferromagnetic
  Weyl semimetal   A magnetic Weyl semimetal is a recent focus of extensive research as it may
exhibit large and robust transport phenomena associated with topologically
protected Weyl points in momentum space. Since a magnetic texture provides a
handle for the configuration of the Weyl points and its transport response,
understanding of magnetic dynamics should form a basis of future control of a
topological magnet. Mn3Sn is an example of an antiferromagnetic Weyl semimetal
that exhibits a large response comparable to the one observed in ferromagnets
despite a vanishingly small magnetization. The non-collinear spin order in
Mn3Sn can be viewed as a ferroic order of cluster magnetic octupole and breaks
the time-reversal symmetry, stabilizing Weyl points and the significantly
enhanced Berry curvature near the Fermi energy. Here we report our first
observation of time-resolved octupole oscillation in Mn3Sn. In particular, we
find the giant effective damping of the octupole dynamics, and it is feasible
to conduct an ultrafast switching at < 10 ps, a hundred times faster than the
case of spin-magnetization in a ferromagnet. Moreover, high domain wall
velocity over 10 km/s is theoretically predicted. Our work paves the path
towards realizing ultrafast electronic devices using the topological
antiferromagnet.

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The categories of this paper are: hep-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an