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Determination of band offsets, hybridization, and exciton binding in 2D semiconductor heterostructures

Wilson, Neil R ; Nguyen, Paul V ; Seyler, Kyle ; Rivera, Pasqual ; Marsden, Alexander J ; Laker, Zachary P L ; Constantinescu, Gabriel C ; Kandyba, Viktor ; Barinov, Alexei ; Hine, Nicholas D M ; Xu, Xiaodong ; Cobden, David H

Science advances, 2017-02, Vol.3 (2), p.e1601832-e1601832 [Periódico revisado por pares]

United States: AAAS

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  • Título:
    Determination of band offsets, hybridization, and exciton binding in 2D semiconductor heterostructures
  • Autor: Wilson, Neil R ; Nguyen, Paul V ; Seyler, Kyle ; Rivera, Pasqual ; Marsden, Alexander J ; Laker, Zachary P L ; Constantinescu, Gabriel C ; Kandyba, Viktor ; Barinov, Alexei ; Hine, Nicholas D M ; Xu, Xiaodong ; Cobden, David H
  • Assuntos: 2D semiconductor ; band hybridization ; commensuration ; Condensed Matter Physics ; erelectronic properties ; Graphene ; heterobilay ; linear-scaling DFT ; MATERIALS SCIENCE ; photoluminescence ; SciAdv r-articles ; μ-ARPES
  • É parte de: Science advances, 2017-02, Vol.3 (2), p.e1601832-e1601832
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    SC0002197; SC0008145; SC0012509
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    These authors contributed equally to this work.
  • Descrição: Combining monolayers of different two-dimensional semiconductors into heterostructures creates new phenomena and device possibilities. Understanding and exploiting these phenomena hinge on knowing the electronic structure and the properties of interlayer excitations. We determine the key unknown parameters in MoSe /WSe heterobilayers by using rational device design and submicrometer angle-resolved photoemission spectroscopy (μ-ARPES) in combination with photoluminescence. We find that the bands in the K-point valleys are weakly hybridized, with a valence band offset of 300 meV, implying type II band alignment. We deduce that the binding energy of interlayer excitons is more than 200 meV, an order of magnitude higher than that in analogous GaAs structures. Hybridization strongly modifies the bands at Γ, but the valence band edge remains at the K points. We also find that the spectrum of a rotationally aligned heterobilayer reflects a mixture of commensurate and incommensurate domains. These results directly answer many outstanding questions about the electronic nature of MoSe /WSe heterobilayers and demonstrate a practical approach for high spectral resolution in ARPES of device-scale structures.
  • Editor: United States: AAAS
  • Idioma: Inglês
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