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Showing 1–23 of 23 results
Advanced filters: Author: Mengkun Liu Clear advanced filters

  • Dirac magnetoexcitons with non-trivial nanoscale electrodynamics are formed from the excitation of Landau levels in charge-neutral graphene. Here, the Dirac magnetoexciton dispersion is directly imaged up to 7 T via a magneto cryogenic near-field microscope.

    • Michael Dapolito
    • Makoto Tsuneto
    • Mengkun Liu
    Research
    Nature Nanotechnology
    Volume: 18, P: 1409-1415

  • Understanding the electromagnetic responses at subwavelength scales is important for achieving tunability. Using a combination of the near-field and far-field spectroscopy, the authors demonstrate a heavy fermion metamaterial with tunable dual-band optical responses by selectively and separately modifying the 4f and 5d band electrons.

    • Stephanie N. Gilbert Corder
    • Xinzhong Chen
    • Mengkun Liu
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-7

  • Here, the authors introduce a cryogenic scanning probe photoelectrical sensing technique, termed exciton-resonant microwave impedance microscopy, to measure the excitonic responses in monolayer MoSe2 and identify exciton polarons and their Rydberg states.

    • Zhurun Ji
    • Mark E. Barber
    • Zhixun Shen
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • Silk protein fibres are exceptionally strong, owing to their high β-sheet nanocrystal content. Here, the authors use an electron beam to guide silk β-sheet crystals through structural transitions, and visualize the changes by infrared near-field optics, achieving close to molecular-level resolution.

    • Nan Qin
    • Shaoqing Zhang
    • Tiger H. Tao
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-8

  • Near- and mid-infrared plasmonics are exciting research areas with applications in nanoscale energy concentration, sensing or ultrafast switching for telecommunication. Now, a new efficient way to manipulate plasmon resonances in semiconductor nanoarrays at ultrafast timescales has been found.

    • Martin Wagner
    • Mengkun Liu
    News & Views
    Nature Photonics
    Volume: 10, P: 210-211

  • The optical response of van der Waals layered crystals is strongly anisotropic. Here, the authors develop a nano-imaging technique to determine the in-plane and out-of-plane components of the anisotropic dielectric tensors in MoS2 and hBN, two representative van der Waals crystals.

    • Debo Hu
    • Xiaoxia Yang
    • Qing Dai
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-8

  • Recent experiments have shown the formation of ferroelectric domains in twisted van der Waals bilayers. Here, the authors report near-field infrared nano-imaging and nano-photocurrent measurements to investigate ferroelectricity in minimally twisted WSe2 by visualizing the plasmonic and photo-thermoelectric response of an adjacent graphene monolayer.

    • Shuai Zhang
    • Yang Liu
    • D. N. Basov
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-8

  • Polaritonic topological transitions of the isofrequency dispersion contour are observed in a graphene/α-MoO3 heterostructure by tuning the graphene doping level, which enables partial focusing at deep subwavelength.

    • Hai Hu
    • Na Chen
    • Qing Dai
    ResearchOpen Access
    Nature Nanotechnology
    Volume: 17, P: 940-946

  • Excitons play an important role in the optical properties of 2D semiconductors, but their spatial characterization is usually constrained by the diffraction limit. Here, the authors report near-field optical spectroscopy of 2D transition metal dichalcogenides with 20 nm resolution, revealing their spatially dependent excitonic spectra and complex dielectric function.

    • Shuai Zhang
    • Baichang Li
    • D. N. Basov
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • Moiré engineering has rapidly gained currency as a means to manipulate electronic states of matter in van der Waals heterostructures. Now, the feat is achieved in epitaxially grown oxide heterostructures, thus opening up fresh opportunities for strongly correlated electronic systems.

    • Xinzhong Chen
    • Xiaodong Fan
    • Changgan Zeng
    Research
    Nature Physics
    Volume: 16, P: 631-635

  • Scattering-type scanning near-field optical microscopy (s-SNOM) enables nanoscale imaging and spectroscopy through elastic light scattering at a scanning probe tip. This Review highlights the fundamental principles, applications and recent advancements of s-SNOM across various sample environments.

    • Rainer Hillenbrand
    • Yohannes Abate
    • D. N. Basov
    Reviews
    Nature Reviews Materials
    Volume: 10, P: 285-310

  • Graphene plasmons hold potential for infrared optoelectronic devices, but the interaction with the substrate often degrades their quality. Here, the authors report the characterization of plasmons in suspended graphene with tunable suspension height, showing enhanced quality factors and propagation lengths at room temperature.

    • Hai Hu
    • Renwen Yu
    • Qing Dai
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-9

  • The behaviour of Tungsten ditelluride (WTe2) in few-layer form is not yet fully characterized. Here the authors use a near-field terahertz microscopy technique to observe the electromagnetic responses of WTe2 flakes from one to several layers and to study their semimetallic/ semiconducting behavior.

    • Ran Jing
    • Yinming Shao
    • D. N. Basov
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-9

  • Here, the authors report photon-energy-dependent terahertz emission and ultrafast photocurrents from the Weyl semimetal, TaAs. The polarization control of the emission is achieved by excitation of the photocurrents whose direction and magnitude depend on the polarization of the femtosecond optical pulses.

    • Y. Gao
    • S. Kaushik
    • J. Qi
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-10