Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for Magnetic Weyl Fermions in a Correlated Metal   Recent discovery of both gapped and gapless topological phases in weakly
correlated electron systems has introduced various relativistic particles and a
number of exotic phenomena in condensed matter physics. The Weyl fermion is a
prominent example of three dimensional (3D), gapless topological excitation,
which has been experimentally identified in inversion symmetry breaking
semimetals. However, their realization in spontaneously time reversal symmetry
(TRS) breaking magnetically ordered states of correlated materials has so far
remained hypothetical. Here, we report a set of experimental evidence for
elusive magnetic Weyl fermions in Mn$_3$Sn, a non-collinear antiferromagnet
that exhibits a large anomalous Hall effect even at room temperature. Detailed
comparison between our angle resolved photoemission spectroscopy (ARPES)
measurements and density functional theory (DFT) calculations reveals
significant bandwidth renormalization and damping effects due to the strong
correlation among Mn 3$d$ electrons. Moreover, our transport measurements have
unveiled strong evidence for the chiral anomaly of Weyl fermions, namely, the
emergence of positive magnetoconductance only in the presence of parallel
electric and magnetic fields. The magnetic Weyl fermions of Mn$_3$Sn have a
significant technological potential, since a weak field ($\sim$ 10 mT) is
adequate for controlling the distribution of Weyl points and the large
fictitious field ($\sim$ a few 100 T) in the momentum space. Our discovery thus
lays the foundation for a new field of science and technology involving the
magnetic Weyl excitations of strongly correlated electron systems.

8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs