Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers

Wu, Fengcheng; Lovorn, Timothy; MacDonald, A. H.

doi:10.1103/PhysRevB.97.035306

Title: Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers

Journal Article · Mon Jan 22 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.035306· OSTI ID:1419946

Wu, Fengcheng ^[1]; Lovorn, Timothy ^[2]; MacDonald, A. H. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Texas, Austin, TX (United States). Department of Physics

In this paper, we present a theory of optical absorption by interlayer excitons in a heterobilayer formed from transition metal dichalcogenides. The theory accounts for the presence of small relative rotations that produce a momentum shift between electron and hole bands located in different layers, and a moire pattern in real space. Because of the momentum shift, the optically active interlayer excitons are located at the moire Brillouin zone's corners, instead of at its center, and would have elliptical optical selection rules if the individual layers were translationally invariant. We show that the exciton moire potential energy restores circular optical selection rules by coupling excitons with different center of mass momenta. A variety of interlayer excitons with both senses of circular optical activity, and energies that are tunable by twist angle, are present at each valley. The lowest energy exciton states are generally localized near the exciton potential energy minima. Finally, we discuss the possibility of using the moire pattern to achieve scalable two-dimensional arrays of nearly identical quantum dots.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; U.S. Army Research Laboratory - U.S. Army Research Office (ARO); Welch Foundation; USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1419946

Alternate ID(s):: OSTI ID: 1417696

Journal Information:: Physical Review B, Vol. 97, Issue 3; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 159 works

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