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Deng, Bingchen

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Deng

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Bingchen

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Deng, Bingchen
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    An Inverse-Designed Nanophotonic Interface for Excitons in Atomically Thin Materials
    (American Chemical Society (ACS), 2023-09-11) Gelly, Ryan; White, Alexander; Scuri, Giovanni; Liao, Xing; Geun Ho, Ahn; Deng, Bingchen; Watanabe, Kenji; Taniguchi, Takashi; Vučković, Jelena; Park, Hongkung
    Efficient nanophotonic devices are essential for applications in quantum networking, optical information processing, sensing, and nonlinear optics. Extensive research efforts have focused on integrating two-dimensional (2D) materials into photonic structures, but this integration is often limited by size and material quality. Here, we use hexagonal boron nitride (hBN), a benchmark choice for encapsulating atomically thin materials, as a waveguiding layer while simultaneously improving the optical quality of the embedded films. When combined with photonic inverse design, it becomes a complete nanophotonic platform to interface with optically active 2D materials. Grating couplers and low-loss waveguides provide optical interfacing and routing, tunable cavities provide a large exciton-photon coupling to transition metal dichalcogenides (TMD) monolayers through Purcell enhancement, and metasurfaces enable the efficient detection of TMD dark excitons. This work paves the way for advanced 2D-material nanophotonic structures for classical and quantum nonlinear optics.
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    Epitaxially defined Luttinger liquids on MoS2 bicrystals
    (American Physical Society) Deng, Bingchen; Ahn, Heonsu; Wang, Jue; Moon, Gunho; Han, Cheolhee; Dongre, Ninad; Lei, Chao; Scuri, Giovanni; Sung, Jiho; Brutschea, Elise; Watanabe, Kenji; Taniguchi, Takashi; Zhang, Fan; Jo, Moon-Ho; Park, Hongkun
    A mirror twin boundary (MTB) in a transition metal dichalcogenide (TMD) monolayer can host one-dimensional electron liquid of a topological nature with tunable interactions. Unfortunately, electrical characterization of such boundaries has been challenging due to the paucity of samples with large enough size and high quality. Here, we report the conductance measurements of individual MTBs in epitaxially grown monolayer molybdenum disulfide (MoS2) bicrystals that are tens of micrometers long. These MTBs exhibit power-law behaviors of conductance as a function of temperature and bias voltage up to room temperature, consistent with electrons tunneling into a Luttinger liquid. Transport measurements of two distinct types of MTBs reveal the critical role of the atomic-scale defects. This study demonstrates that MTBs in TMD monolayers provide an exciting new platform for studying the interplay between electronic interactions and topology.