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Ultrafast non-excitonic valley Hall effect in MoS2/WTe2 heterobilayers

Author

Listed:
  • Jekwan Lee

    (Seoul National University
    Seoul National University)

  • Wonhyeok Heo

    (Seoul National University)

  • Myungjun Cha

    (Seoul National University
    Seoul National University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Jehyun Kim

    (Seoul National University)

  • Soonyoung Cha

    (Institute for Basic Science)

  • Dohun Kim

    (Seoul National University)

  • Moon-Ho Jo

    (Institute for Basic Science)

  • Hyunyong Choi

    (Seoul National University
    Seoul National University)

Abstract

The valley Hall effect (VHE) in two-dimensional (2D) van der Waals (vdW) crystals is a promising approach to study the valley pseudospin. Most experiments so far have used bound electron-hole pairs (excitons) through local photoexcitation. However, the valley depolarization of such excitons is fast, so that several challenges remain to be resolved. We address this issue by exploiting a unipolar VHE using a heterobilayer made of monolayer MoS2/WTe2 to exhibit a long valley-polarized lifetime due to the absence of electron-hole exchange interaction. The unipolar VHE is manifested by reduced photoluminescence at the MoS2 A exciton energy. Furthermore, we provide quantitative information on the time-dependent valley Hall dynamics by performing the spatially-resolved ultrafast Kerr-rotation microscopy; we find that the valley-polarized electrons persist for more than 4 nanoseconds and the valley Hall mobility exceeds 4.49 × 103 cm2/Vs, which is orders of magnitude larger than previous reports.

Suggested Citation

  • Jekwan Lee & Wonhyeok Heo & Myungjun Cha & Kenji Watanabe & Takashi Taniguchi & Jehyun Kim & Soonyoung Cha & Dohun Kim & Moon-Ho Jo & Hyunyong Choi, 2021. "Ultrafast non-excitonic valley Hall effect in MoS2/WTe2 heterobilayers," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21013-w
    DOI: 10.1038/s41467-021-21013-w
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