Polarity-dependent twist-controlled resonant tunneling device based on few-layer 
<math>
  <mrow>
    <mi>W</mi>
    <msub>
      <mi>Se</mi>
      <mn>2</mn>
    </msub>
  </mrow>
</math>

Kei Kinoshita; Rai Moriya; Shota Okazaki; Yijin Zhang; Satoru Masubuchi; Kenji Watanabe; Takashi Taniguchi; Takao Sasagawa; Tomoki Machida

doi:10.1103/physrevresearch.5.043292

Article Polarity-dependent twist-controlled resonant tunneling device based on few-layer

W {Se}_{2}

Kei Kinoshita ; Rai Moriya ; Shota Okazaki ; Yijin Zhang ; Satoru Masubuchi ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Takao Sasagawa ; Tomoki Machida

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Kei Kinoshita, Rai Moriya, Shota Okazaki, Yijin Zhang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Takao Sasagawa, Tomoki Machida. Polarity-dependent twist-controlled resonant tunneling device based on few-layer

W {Se}_{2}

. Physical Review Research. 2023, 5 (4), 043292. https://doi.org/10.1103/physrevresearch.5.043292

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Few-layer-thick transition metal dichalcogenides have recently been found to exhibit discrete subbands, called van der Waals quantum well (vdW-QW) states, owing to the out-of-plane quantum confinement. The vdW-QW in the conduction band (CB) remained unelucidated due to the difficulty to access these states with conventional methods. Here we investigate the vdW-QW in the CB of 3- layer (3L) WSe2 using resonant tunneling in 3L WSe2/h-BN/3L WSe2 junction under the control of inter-layer twist angle θint between two WSe2 layers. Measured current–voltage characteristics exhibit multiple resonant tunneling peaks, and their positions are continuously modulated in the broad range of θint from 0 to 60°. The results showed good agreement with calculated angular dispersion of the CB, including a crossing of spin-polarized subbands and a presence of saddle point. Our twist-controlled resonant tunneling overcome difficulties in measuring the momentum-resolved electronic structure and unveil the unique vdW-QW structure in the CB of 3L-WSe2.

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