2D layered materials

Two-dimensional (2D) layered materials are crystals with strong intralayer bonds but only weak, van-der-Waals type interlayer bonds, such as graphite, MoS₂, or hexagonal boron nitride (hBN). They can be exfoliated to an atomically thin monolayer and stacked into heterostructures with almost arbitrary choice ofcombinations. Besides graphene, the most famous 2D materials are transition metal dichalcogenides (TMDCs), specifically MoS₂, MoSe₂, WS₂, and WSe₂. These materials have intriguing optical and electronic characteristics. For example, they are indirect semiconductors in the bulk but show strong excitonic emission in the visible range in their monolayer form. We are interested in their optical properties, including exciton-phonon coupling, and in their interactions in heterostructures with other layers.

Projects:

Strong interlayer interactions in two-dimensional pnictogen-based homo- and heterobilayersStrong interlayer interactions in two-dimensional pnictogen-based homo- and heterobilayers

Term: 1. April 2025 - 30. März 2028
Funding source: Deutsche Forschungsgemeinschaft (DFG)
Project leader: Janina Maultzsch

Prof. Dr. Janina Maultzsch

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SFB 1719 S04: Exzitonen und Phononen an vertikalen und lateralen Grenzflächen in ultradünnen HalbleiternSFB 1719 S04: Exzitonen und Phononen an vertikalen und lateralen Grenzflächen in ultradünnen Halbleitern

Term: 1. Oktober 2025 - 30. Juni 2029
Funding source: DFG / Sonderforschungsbereich (SFB)
Acronym: SFB 1719 S04
Project leader: Janina Maultzsch

Prof. Dr. Janina Maultzsch

In project S4,we will investigate the fundamental physicalproperties of novelsolution-grown ultrathin two-dimensional (2D) semiconductors and their verticaland lateral heterostructures by advanced optical spectroscopy. The physicalproperties to be determined include the crystallinestructure and the vibrational, electronic, and optical properties of the 2D semiconductors. In addition, we willexplore the effect of substrate and interfaceinduced strain and the role of defects and grain boundaries o…

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Contact Persons:

• Janina Maultzsch

Participating Scientists:

• Janina Maultzsch
• Roland Gillen

Publications:

• Wolff S., Gillen R., Assebban M., Abellan Saez G., Maultzsch J.:
  Two-Dimensional Antimony Oxide
  In: Physical Review Letters 124 (2020), p. 126101
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.124.126101
• Tornatzky H., Gillen R., Uchiyama H., Maultzsch J.:
  Phonon dispersion of MoS2
  In: Physical Review B 99 (2019), p. 144309
  ISSN: 2469-9950
  DOI: 10.1103/PhysRevB.99.144309
  URL: https://arxiv.org/abs/1809.03381
• Gillen R., Maultzsch J.:
  Interlayer excitons in MoSe2/WSe2 heterostructures from first principles
  In: Physical Review B 97 (2018)
  ISSN: 2469-9950
  DOI: 10.1103/PhysRevB.97.165306
• Gillen R., Maultzsch J.:
  Light-Matter Interactions in Two-Dimensional Transition Metal Dichalcogenides: Dominant Excitonic Transitions in Mono- and Few-Layer MoX2 and Band Nesting
  In: IEEE Journal of Selected Topics in Quantum Electronics 23 (2017)
  ISSN: 1077-260X
  DOI: 10.1109/JSTQE.2016.2604359
• Schneider E., Watanabe K., Taniguchi T., Maultzsch J.:
  Interlayer Raman modes in twisted bilayer transition metal dichalcogenides
  In: Physical Review B 110 (2024), Article No.: 125431
  ISSN: 0163-1829
  DOI: 10.1103/PhysRevB.110.125431