Evidence for moiré excitons in van der Waals heterostructures

Kha Tran, Galan Moody, Fengcheng Wu (), Xiaobo Lu, Junho Choi, Kyounghwan Kim, Amritesh Rai, Daniel A. Sanchez, Jiamin Quan, Akshay Singh, Jacob Embley, André Zepeda, Marshall Campbell, Travis Autry, Takashi Taniguchi, Kenji Watanabe, Nanshu Lu, Sanjay K. Banerjee, Kevin L. Silverman, Suenne Kim, Emanuel Tutuc, Li Yang, Allan H. MacDonald and Xiaoqin Li ()
Additional contact information
Kha Tran: The University of Texas at Austin
Galan Moody: National Institute of Standards & Technology
Fengcheng Wu: Argonne National Laboratory
Xiaobo Lu: Washington University in St Louis
Junho Choi: The University of Texas at Austin
Kyounghwan Kim: The University of Texas at Austin
Amritesh Rai: The University of Texas at Austin
Daniel A. Sanchez: The University of Texas at Austin
Jiamin Quan: The University of Texas at Austin
Akshay Singh: The University of Texas at Austin
Jacob Embley: The University of Texas at Austin
André Zepeda: The University of Texas at Austin
Marshall Campbell: The University of Texas at Austin
Travis Autry: National Institute of Standards & Technology
Takashi Taniguchi: National Institute of Material Science
Kenji Watanabe: National Institute of Material Science
Nanshu Lu: The University of Texas at Austin
Sanjay K. Banerjee: The University of Texas at Austin
Kevin L. Silverman: National Institute of Standards & Technology
Suenne Kim: Hanyang University
Emanuel Tutuc: The University of Texas at Austin
Li Yang: Washington University in St Louis
Allan H. MacDonald: The University of Texas at Austin
Xiaoqin Li: The University of Texas at Austin

Nature, 2019, vol. 567, issue 7746, 71-75

Abstract: Abstract Recent advances in the isolation and stacking of monolayers of van der Waals materials have provided approaches for the preparation of quantum materials in the ultimate two-dimensional limit1,2. In van der Waals heterostructures formed by stacking two monolayer semiconductors, lattice mismatch or rotational misalignment introduces an in-plane moiré superlattice3. It is widely recognized that the moiré superlattice can modulate the electronic band structure of the material and lead to transport properties such as unconventional superconductivity4 and insulating behaviour driven by correlations5–7; however, the influence of the moiré superlattice on optical properties has not been investigated experimentally. Here we report the observation of multiple interlayer exciton resonances with either positive or negative circularly polarized emission in a molybdenum diselenide/tungsten diselenide (MoSe2/WSe2) heterobilayer with a small twist angle. We attribute these resonances to excitonic ground and excited states confined within the moiré potential. This interpretation is supported by recombination dynamics and by the dependence of these interlayer exciton resonances on twist angle and temperature. These results suggest the feasibility of engineering artificial excitonic crystals using van der Waals heterostructures for nanophotonics and quantum information applications.

Date: 2019
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DOI: 10.1038/s41586-019-0975-z

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