Interlayer Exciton–Polaron in Atomically Thin Semiconductors

A novel type of exciton–phonon bound state—interlayer polaron—in a double‐layer 2D semiconductor with transition metal dichalcogenides as an example, is predicted. In these systems, the interaction of the interlayer exciton with the soft modes of out‐of‐plane lattice vibrations caused by van der Waa...

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Bibliographic Details
Published in:Annalen der Physik 2020-12, Vol.532 (12), p.n/a
Main Authors: Semina, Marina A., Glazov, Mikhail M., Sherman, Eugene
Format: Article
Language:English
Subjects:
Elementary excitations
Excitons
Interlayers
Lattice vibration
Phonons
polaron
Polarons
Transition metal compounds
transition metal dichalcogenides
Van der Waals forces
van der Waals heterostructures
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Summary:A novel type of exciton–phonon bound state—interlayer polaron—in a double‐layer 2D semiconductor with transition metal dichalcogenides as an example, is predicted. In these systems, the interaction of the interlayer exciton with the soft modes of out‐of‐plane lattice vibrations caused by van der Waals forces and flexural rigidity gives rise to a bound quasiparticle. The energy and effective mass of the formed polaron for weak and strong exciton–phonon coupling regimes are calculated and analyzed. Possible manifestations of these effects in transport‐ and spectroscopy‐related experiments are discussed. A novel exciton–phonon bound state, an interlayer polaron, in double‐layer transition metal dichalcogenides, is predicted. The interaction of the interlayer exciton with the soft out‐of‐plane vibration modes produces a bound quasiparticle. The energy and effective mass of these polarons are calculated and analyzed. Possible experimental consequences for transport and spectroscopy are discussed.
ISSN:0003-3804
1521-3889
DOI:10.1002/andp.202000339