Exciton landscape in van der Waals heterostructures
Artikel i vetenskaplig tidskrift, 2021

van der Waals heterostructures consisting of vertically stacked transition-metal dichalcogenides (TMDs) exhibit a rich landscape of bright and dark intra- and interlayer excitons. In spite of a growing literature in this field of research, the type of excitons dominating optical spectra in different van der Waals heterostructures has not yet been well established. The spectral position of exciton states depends strongly on the strength of hybridization and energy renormalization due to the periodic moire potential. Combining exciton density-matrix formalism and density-functional theory, we shed light on the exciton landscape in TMD homo- and heterobilayers at different stackings. This allows us to identify on a microscopic footing the energetically lowest-lying exciton state for each material and stacking. Furthermore, we disentangle the contribution of hybridization and layer polarization-induced alignment shifts of dark and bright excitons in photoluminescence spectra. By revealing the exciton landscape in van der Waals heterostructures, our work provides the basis for further studies of the optical, dynamical, and transport properties of this technologically promising class of nanomaterials.

Författare

Joakim Hagel

Chalmers, Fysik, Kondenserad materie- och materialteori

Samuel Brem

Philipps-Universität Marburg

Christopher Linderälv

Chalmers, Fysik, Kondenserad materie- och materialteori

Paul Erhart

Chalmers, Fysik, Kondenserad materie- och materialteori

Ermin Malic

2D-Tech

Chalmers, Fysik, Kondenserad materie- och materialteori

Philipps-Universität Marburg

Physical Review Research

26431564 (ISSN)

Vol. 3 4 043217

2D material-baserad teknologi för industriella applikationer (2D-TECH)

GKN Aerospace Sweden (2D-tech), 2021-01-01 -- 2024-12-31.

VINNOVA (2019-00068), 2020-05-01 -- 2024-12-31.

Excitondynamik i atomiskt tunna material

Vetenskapsrådet (VR) (2018-00734), 2019-01-01 -- 2024-12-31.

Datorbaserad materialutveckling för transportegenskaper

Knut och Alice Wallenbergs Stiftelse, 2015-07-01 -- 2020-06-30.

Graphene Core Project 3 (Graphene Flagship)

Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.

Styrkeområden

Nanovetenskap och nanoteknik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevResearch.3.043217

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Senast uppdaterat

2024-02-29