Direct observation of electronic structures in WTe<sub>2</sub> flakes with a small number of layers by micro-focused laser-based angle-resolved photoemission spectroscopy

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  • 顕微レーザー角度分解光電子分光による原子層WTe<sub>2</sub>フレークの電子状態の観測
  • 顕微レーザー角度分解光電子分光による原子層WTe₂フレークの電子状態の観測
  • ケンビレーザー カクド ブンカイ コウデンシ ブンコウ ニ ヨル ゲンシソウ WTe ₂ フレーク ノ デンシ ジョウタイ ノ カンソク

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<p>When a crystal becomes thin at the atomic level, peculiar phenomena discretely depending on its layer-numbers (n) start to appear. Multilayer WTe2 is one such example, exhibiting unique ferroelectricity and non-linear transport properties related to the antiphase stacking and Berry-curvature dipole. Here we investigate the electronic band dispersions of multilayer WTe2 (2-5 layers), by performing laser-based micro-focused angle-resolved photoelectron spectroscopy on exfoliated-flakes strictly sorted by n. We observed the insulator-semimetal transition occurring between 2 and 3-layers, as well as the 30-70 meV spin-splitting of valence bands manifesting in even n as a signature of stronger structural asymmetry. Our results fully demonstrate the possibility of a large energy-scale band and spin manipulation through the finite n stacking procedure.</p>

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  • Oyo Buturi

    Oyo Buturi 90 (11), 679-683, 2021-11-01

    The Japan Society of Applied Physics

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