Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Valley Phenomena in the Candidate Phase Change Material
  WSe$_{2(1-x)}$Te$_{2x}$   Alloyed transition metal dichalcogenides provide an opportunity for coupling
band engineering with valleytronic phenomena in an atomically-thin platform.
However, valley properties in alloys remain largely unexplored. We investigate
the valley degree of freedom in monolayer alloys of the phase change candidate
material WSe$_{2(1-x)}$Te$_{2x}$. Low temperature Raman measurements track the
alloy-induced transition from the semiconducting 1H phase of WSe$_2$ to the
semimetallic 1T$_d$ phase of WTe$_2$. We correlate these observations with
density functional theory calculations and identify new Raman modes from W-Te
vibrations in the 1H alloy phase. Photoluminescence measurements show ultra-low
energy emission features that highlight alloy disorder arising from the large
W-Te bond lengths. Interestingly, valley polarization and coherence in alloys
survive at high Te compositions and are more robust against temperature than in
WSe$_2$. These findings illustrate the persistence of valley properties in
alloys with highly dissimilar parent compounds and suggest band engineering can
be utilized for valleytronic devices.

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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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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: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: q-fin