Seminarium Fizyki Politechniki Wrocławskiej
PWr, bud. A1, sala 322
Interlayer excitons in twisted van der Waals heterostructures based on transition metal dichalgogenides
Dr Jens Kunstmann
Theoretical Chemistry, Department of Chemistry, TU Dresden, Germany
The investigation and development of two-dimensional (2D) crystals is currently a focus of research worldwide. Also van der Waals heterostructures, a deterministic stacking of 2D crystals, are currently of great interest because they allow to generate artificial crystals with no limitation on the sequence of 2D materials that are stacked and no limitation on the relative crystallographic orientation (twist angle). The recently found magnetism and superconductivity in bilayer graphene, twisted by a special ("magic") angle, indicates that complex many-body phenomena occur in van der Waals heterostructures. The occurence of so called interlayer-excitons (ILE) in transition metal dichalgogenide (TMD)-based heterostructures is another example of great interest. These charge-separated excitons might have a great potential for photovoltaic applications and could allow the study of exotic states of matter, such as Bose-Einstein condensates.
In my talk I will report about our recent insights on momentum-space indirect interlayer excitons in twisted MoS2/WSe2 heterobilayers and on interlayer exciton dynamics in twist-angle-dependent moiré potentials in WS2-WSe2 heterobilayers [1-4].
related publications:
[1] Chen, … J. Kunstmann et al., Nano Lett. 19, 2464 (2019).
[2] Kunstmann, Mooshammer et al., Nature Physics 14, 801 (2018).
[3] Yeh, Jin, Zaki, Kunstmann et al., Nano Letters 16, 953 (2016).
[4] van der Zande, Kunstmann et al., Nano Letters 14, 3869 (2014).
