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Showing 1–14 of 14 results
Advanced filters: Author: Ioannis Paradisanos Clear advanced filters

  • The authors investigate the interplay between the stacking order and the interlayer coupling in MoS2 homobilayers as well as artificially stacked bilayers grown by chemical vapour deposition, and identify the interlayer exciton absorption and A-B exciton separation as indicators for interlayer coupling.

    • Ioannis Paradisanos
    • Shivangi Shree
    • Bernhard Urbaszek
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-7

  • Interlayer excitons in bilayer MoS2 exhibit both a high oscillator strength and highly tunable energies in an applied electric field.

    • Nadine Leisgang
    • Shivangi Shree
    • Bernhard Urbaszek
    Research
    Nature Nanotechnology
    Volume: 15, P: 901-907

  • Enhancing and tuning light-matter interactions is crucial for the advancement of future technologies; however, to achieve this, it is essential to find materials that are compatible with CMOS technology. In this study, the authors demonstrate that coupling a MoSe2 monolayer with a silicon-based dielectric nanoresonator can enhance and tune the absorption of the former to near-field resonances.

    • Ana Estrada-Real
    • Ioannis Paradisanos
    • Bernhard Urbaszek
    ResearchOpen Access
    Communications Physics
    Volume: 6, P: 1-7

  • Ultrafast laser fields are able to widely tune the physical properties of semiconductors by generating virtual states. Using strong fields at energies below the optical bandgap, control of excitons in two-dimensional semiconductors has now been demonstrated.

    • Ioannis Paradisanos
    • Bernhard Urbaszek
    News & Views
    Nature Physics
    Volume: 19, P: 149-150

  • Here, the authors use tip-enhanced photoluminescence spectroscopy to show a discontinuity of the exciton density distribution on each side of the interface of a MoSe2/WSe2 lateral heterostructure. They introduce the concept of ‘exciton Kapitza resistance’ by analogy with the interfacial thermal resistance known as ‘Kapitza resistance’.

    • Hassan Lamsaadi
    • Dorian Beret
    • Jean-Marie Poumirol
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-8

  • The authors unveil the many-particle processes underpinning the formation of bound charge transfer excitons at the interface of hBN-encapsulated lateral MoSe2-WSe2 heterostructures. The excitons can be tuned via interface (i.e. high quality lateral junction) and dielectric (i.e. hBN encapsulation) engineering.

    • Roberto Rosati
    • Ioannis Paradisanos
    • Ermin Malic
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-9

  • Efficient second-harmonic generation (SHG) occurs for crystals with broken inversion symmetry, such as transition metal dichalcogenide monolayers. Here the authors show SHG tuning in bilayer MoS2 - an inversion-symmetric crystal - mediated by interlayer excitons.

    • Shivangi Shree
    • Delphine Lagarde
    • Ioannis Paradisanos
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-9

  • The primary stages of carrier relaxation in atomically thin transition metal dichalcogenides are hardly accessible due to their fast timescales. Here, the authors measure the first stages of carrier–phonon interaction in monolayer WSe2 via a series of periodic maxima in the hot photoluminescence intensity, assigned to phonon cascades.

    • Ioannis Paradisanos
    • Gang Wang
    • Bernhard Urbaszek
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-7

  • Understanding light–matter interactions in layered materials is crucial for applications in photonics and optoelectronics. This Technical Review discusses the optical spectroscopy techniques to access details of the electronic band structure, crystal quality, crystal orientation and spin–valley polarization, including key aspects of practical set-ups to perform experiments for a broad range of applications.

    • Shivangi Shree
    • Ioannis Paradisanos
    • Bernhard Urbaszek
    Reviews
    Nature Reviews Physics
    Volume: 3, P: 39-54

  • Excitons are quasiparticles consisting of an electron-hole pair and can be used to study many-body phenomenon. Here, the authors demonstrate on-demand quantum confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures deposited on nanopatterned substrates.

    • Alejandro R.-P. Montblanch
    • Dhiren M. Kara
    • Mete Atatüre
    ResearchOpen Access
    Communications Physics
    Volume: 4, P: 1-8