Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic exchange induced Weyl state in a semimetal EuCd2Sb2   Magnetic Weyl semimetals (WSMs) bearing long-time pursuing are still very
rare. We herein identified magnetic exchange induced Weyl state in EuCd2Sb2, a
semimetal in type IV magnetic space group, via performing high magnetic field
(B) magneto-transport measurements and ab initio calculations. For the A-type
antiferromagnetic (AFM) structure of EuCd2Sb2, external B larger than 3.2 T can
align Eu spins to be fully polarized along the c-axis and consequently drive
the system into a ferromagnetic (FM) state. Measurements up to B ~ 55 T
revealed a striking Shubnikov-de Hass oscillation imposed by a nontrivial Berry
phase. We unveiled a phase transition from a small-gap AFM topological
insulator into a FM WSM in which Weyl points emerged along the {\Gamma}-Z path.
Fermi arcs on (100) and (010) surfaces are also revealed. The results pave a
way towards realization of various topological states in a single material
through magnetic exchange manipulation.

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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys