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Showing 1–12 of 12 results
Advanced filters: Author: Ruishi Qi Clear advanced filters

  • The formation of exciton crystals is challenging because excitons possess short lifetimes and exhibit weaker interactions than electrons. Now, an exciton Wigner crystal is observed in a moiré electron–hole bilayer.

    • Ruishi Qi
    • Qize Li
    • Feng Wang
    Research
    Nature Physics
    Volume: 22, P: 514-520

  • Transition metal dichalcogenide bilayers offer a novel platform for studying correlated electron-hole fluids. Here the authors use optical spectroscopy to probe thermodynamic properties of coupled electron-hole states in MoSe2/hBN/WSe2 heterostructures, providing evidence for an excitonic insulator ground state.

    • Ruishi Qi
    • Andrew Y. Joe
    • Feng Wang
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-9

  • Four-dimensional electron energy-loss spectroscopy measurements of the vibrational spectra and the phonon dispersion at a heterointerface show localized modes that are predicted to affect the thermal conductance and electron mobility.

    • Ruishi Qi
    • Ruochen Shi
    • Peng Gao
    Research
    Nature
    Volume: 599, P: 399-403

  • The authors characterize the phonon modes at the FeSe/SrTiO3 interface with atomically resolved electron energy loss spectroscopy and correlate them with accurate atomic structure in an electron microscope. They find several phonon modes highly localized at the interface, one of which engages in strong interactions with the electrons in FeSe.

    • Ruochen Shi
    • Qize Li
    • Peng Gao
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-7

  • In an application of terahertz phonon engineering, terahertz phonons were generated, detected and manipulated through precise integration of atomically thin layers in van der Waals heterostructures.

    • Yoseob Yoon
    • Zheyu Lu
    • Feng Wang
    Research
    Nature
    Volume: 631, P: 771-776

  • Here, the authors probe the phonon changes across an atomically sharp h-10BN/h-11BN isotope interface with sub-unit-cell spatial resolution and momentum resolution. The observed phonon delocalization suggests strong electron-phonon coupling at isotopic interface.

    • Ning Li
    • Ruochen Shi
    • Peng Gao
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-7

  • Employing a remote Coulomb superlattice formed by twisted bilayer WS2, the authors demonstrate the engineering and on/off switching of a Coulomb superlattice of correlated states in bilayer graphene with period and strength determined by the remote superlattice.

    • Zuocheng Zhang
    • Jingxu Xie
    • Feng Wang
    Research
    Nature Materials
    Volume: 23, P: 189-195