Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Progress on Layered Topological Semimetals   We review recent experimental progresses on layered topological materials,
mainly focusing on transitional metal dichalcogenides with various lattice
types including 1T, Td and 1T' structural phases. Their electronic quantum
states are interestingly rich, and many appear to be topological nontrivial,
such as Dirac/Weyl semimetallic phase in multilayers and quantum spin hall
insulator phase in monolayers. The content covers recent major advances from
material synthesis, basic characterizations, angle-resolved photoemission
spectroscopy measurements, transport and optical responses. Following those, we
outlook the exciting future possibilities enabled by the marriage of
topological physics and two dimensional van der Waals layered heterostructures.

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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex