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Sung, Jiho

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Sung

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Jiho

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Sung, Jiho

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2020 - 20254

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Author's Publications: search.filters.isAuthorOfPublication.e3e0eb9e-3896-4418-9480-eeb09fc180ca

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Now showing 1 - 5 of 5
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    Bilayer Wigner crystals in a transition metal dichalcogenide heterostructure
    (Springer Science and Business Media LLC, 2021-06-30) Zhou, You; Sung, Jiho; Brutschea, Elise; Esterlis, Ilya; Wang, Yao; Scuri, Giovanni; Gelly, Ryan J.; Heo, Hoseok; Taniguchi, Takashi; Watanabe, Kenji; Zaránd, Gergely; Lukin, Mikhail D.; Kim, Philip; Demler, Eugene; Park, Hongkun
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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.
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    Correlated insulator and Chern insulators in pentalayer rhombohedral-stacked graphene
    (Springer Science and Business Media LLC, 2023-10-05) Han, Tonghang; Lu, Zhengguang; Scuri, Giovanni; Sung, Jiho; Wang, Jue; Han, Tianyi; Watanabe, Kenji; Taniguchi, Takashi; Park, Hongkun; Ju, Long
    Rhombohedral stacked multilayer graphene hosts a pair of flat bands touching at zero energy, which should give rise to correlated electron phenomena that can be further tuned by an electric field. Furthermore, when electron correlation breaks the isospin symmetry, the valley-dependent Berry phase at zero energy may give rise to topologically non-trivial states. Here, we measure electron transport through hBN-encapsulated pentalayer graphene down to 100 mK. We observed a correlated insulating state with resistance R>MΩ at charge density n=0 and displacement field D=0. Tight-binding calculations predict a metallic ground state under these conditions. By increasing D, we observed a Chern insulator state with C = -5 and two other states with C = -3 at magnetic field around 1 T. At high D and n, we observed isospin-polarized quarter- and half-metals. Hence, rhombohedral stacked pentalayer graphene exhibits two different types of Fermi-surface instabilities, one driven by a pair of flat bands touching at zero energy, and one induced by the Stoner mechanism in a single flat band. Our results establish rhombohedral stacked multilayer graphene as suitable system to explore intertwined electron correlation and topology phenomena in natural graphitic materials without the need for moiré superlattice engineering.
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    An electronic microemulsion phase emerging from a quantum crystal-to-liquid transition
    (Springer Science and Business Media LLC, 2025-01-20) Sung, Jiho; Wang, Jue; Esterlis, Ilya; Volkov, Pavel A.; Scuri, Giovanni; Zhou, You; Brutschea, Elise; Taniguchi, Takashi; Watanabe, Kenji; Yang, Yubo; Morales, Miguel A.; Zhang, Shiwei; Millis, Andrew J.; Lukin, Mikhail D.; Kim, Philip; Demler, Eugene; Park, Hongkun
    Strongly interacting electronic systems often exhibit a complicated phase diagram that results from the competition between different quantum ground states. One feature of these phase diagrams is the emergence of microemulsion phases, where regions of different phases self-organize across multiple length scales. The experimental characterization of these microemulsions can pose significant challenges, as the long-range Coulomb interaction microscopically mingles the competing states. Here, we observe the signatures of the microemulsion between an electronic Wigner crystal and an electron liquid in a MoSe2 monolayer using cryogenic reflectance and magneto-optical spectroscopy. We find that the transition into this microemulsion state is marked by anomalies in exciton reflectance, spin susceptibility, and umklapp scattering, establishing it as a distinct phase of electronic matter.
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    Broken Mirror Symmetry in Excitonic Response of Reconstructed Domains in Twisted MoSe2/MoSe2 Bilayers
    (Springer Science and Business Media LLC, 2020-07-13) Sung, Jiho; Zhou, You; Scuri, Giovanni; Zólyomi, Viktor; Andersen, Trond; Yoo, Hyobin; Wild, Dominik; Joe, Andrew Y.; Gelly, Ryan; Heo, Hoseok; Magorrian, Samuel J.; Berube, Damien; Valdivia, Andrés M. Mier; Taniguchi, Takashi; Watanabe, Kenji; Lukin, Mikhail D.; Kim, Philip; Fal’ko, Vladimir I.; Park, Hongkun
    Van der Waals heterostructures obtained via stacking and twisting have been used to create moiré superlattices, enabling new optical and electronic properties in solid-state systems. Moiré lattices in twisted bilayers of transition metal dichalcogenides (TMDs) result in exciton trapping, host Mott insulating and superconducting states, and act as unique Hubbard systems whose correlated electronic states can be detected and manipulated optically. Structurally, these twisted heterostructures feature atomic reconstruction and domain formation. However, due to the nanoscale sizes of moiré domains, the effects of atomic reconstruction on the electronic and excitonic properties could not be systematically investigated. Here, we use near 0o twist angle MoSe2/MoSe2 bilayers with large rhombohedral AB/BA domains to directly probe excitonic properties of individual domains with far-field optics. We show that this system features broken mirror/inversion symmetry, with the AB and BA domains supporting interlayer excitons with out-of-plane electric dipole moments in opposite directions. The dipole orientation of ground-state Γ-K interlayer excitons can be flipped with electric fields, while higher-energy K-K interlayer excitons undergo field-asymmetric hybridization with intralayer K-K excitons. Our study reveals the impact of crystal symmetry on TMD excitons and points to new avenues for realizing topologically nontrivial systems, exotic metasurfaces, collective excitonic phases, and quantum emitter arrays via domain-pattern engineering.