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Showing 1–6 of 6 results
Advanced filters: Author: Jekwan Lee Clear advanced filters

  • The standard topological insulator is characterized by an insulating bulk and a conducting boundary, so a three dimensional insulating bulk of a topological insulator has a conducting surface. Recently, this idea was extended to the edges of the surfaces of the three dimensional material as a new topological phase, referred to as a higher-order topological insulator. Here, the authors find evidence of such higher order topological insulator states in tungsten ditelluride using heterostructures composed of tungsten ditelluride and graphene.

    • Jekwan Lee
    • Jaehyeon Kwon
    • Hyunyong Choi
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-6

  • The valley Hall effect in 2D materials is a promising approach for future valleytronic applications, but it is usually based on excitons with short lifetimes. Here, spin polarized electrons are injected from WTe2 into MoS2, leading to a unipolar valley Hall effect with enhanced lifetimes and mobility.

    • Jekwan Lee
    • Wonhyeok Heo
    • Hyunyong Choi
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-6

  • The authors study the light-driven dynamics of attractive and repulsive Fermi polarons in monolayer WSe2. They show that the resonance shifts of Fermi polarons are valley-selective; the resonance shifts of attractive polarons increase with Fermi-sea density, while those of repulsive polarons decrease.

    • Hyojin Choi
    • Jinjae Kim
    • Hyunyong Choi
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-7

  • Photolithography is an established microfabrication technique but commonly uses costly shortwavelength light sources to achieve high resolution. Here the authors use metal patterns embedded in a flexible elastomer photomask with mechanical robustness for generation of subdiffraction patterns as a cost effective near-field optical printing approach.

    • Sangyoon Paik
    • Gwangmook Kim
    • Wooyoung Shim
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-13

  • Kinetics-controlled van der Waals epitaxy in the near-equilibrium limit by metal–organic chemical vapour deposition enables precise layer-by-layer stacking of dissimilar transition metal dichalcogenides.

    • Gangtae Jin
    • Chang-Soo Lee
    • Moon-Ho Jo
    Research
    Nature Nanotechnology
    Volume: 16, P: 1092-1098