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Article: Twist versus heterostrain control of optical properties of moiré exciton minibands
Title | Twist versus heterostrain control of optical properties of moiré exciton minibands |
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Authors | |
Keywords | moire superlattice exciton twistronics strain 2D semiconductors |
Issue Date | 2021 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/ |
Citation | 2D Materials, 2021, v. 8 n. 4, p. article no. 044016 How to Cite? |
Abstract | We investigate the optical properties of interlayer excitons in heterobilayer transition metal dichalcogenides where moiré pattern is introduced by heterostrain, in comparison with that introduced by twisting (and/or lattice mismatch). Besides being a cause of the moiré texture, strain also effectively introduces a constant gauge potential on either electron or hole, which shifts the dispersion of kinetic energy with respect to the excitonic crystal momenta in the moiré superlattices. This leads to distinct exciton mini-band dispersions and light coupling properties from the twisting induced moiré, even if the excitonic moiré superlattice potentials have the similar real-space profile for the two cases. For strain that breaks the three-fold rotational symmetry at the atomic scale, the exciton wave packets trapped at the superlattice potential minima have elliptically polarized valley optical selection rules, in contrast to the circularly polarized ones in the twisting moiré. We investigate the evolution of the excitonic mini-bands and the optical dipoles of the bright states inside the light cones with the decrease of the moiré periodicity, upon which the excitonic wave functions evolve from localized wave packets to the extended Bloch states. Furthermore, moiré exciton properties under the interplay of twisting and heterostrain are also discussed. |
Persistent Identifier | http://hdl.handle.net/10722/307702 |
ISSN | 2023 Impact Factor: 4.5 2023 SCImago Journal Rankings: 1.483 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | ZHENG, H | - |
dc.contributor.author | Zhai, D | - |
dc.contributor.author | Yao, W | - |
dc.date.accessioned | 2021-11-12T13:36:33Z | - |
dc.date.available | 2021-11-12T13:36:33Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | 2D Materials, 2021, v. 8 n. 4, p. article no. 044016 | - |
dc.identifier.issn | 2053-1583 | - |
dc.identifier.uri | http://hdl.handle.net/10722/307702 | - |
dc.description.abstract | We investigate the optical properties of interlayer excitons in heterobilayer transition metal dichalcogenides where moiré pattern is introduced by heterostrain, in comparison with that introduced by twisting (and/or lattice mismatch). Besides being a cause of the moiré texture, strain also effectively introduces a constant gauge potential on either electron or hole, which shifts the dispersion of kinetic energy with respect to the excitonic crystal momenta in the moiré superlattices. This leads to distinct exciton mini-band dispersions and light coupling properties from the twisting induced moiré, even if the excitonic moiré superlattice potentials have the similar real-space profile for the two cases. For strain that breaks the three-fold rotational symmetry at the atomic scale, the exciton wave packets trapped at the superlattice potential minima have elliptically polarized valley optical selection rules, in contrast to the circularly polarized ones in the twisting moiré. We investigate the evolution of the excitonic mini-bands and the optical dipoles of the bright states inside the light cones with the decrease of the moiré periodicity, upon which the excitonic wave functions evolve from localized wave packets to the extended Bloch states. Furthermore, moiré exciton properties under the interplay of twisting and heterostrain are also discussed. | - |
dc.language | eng | - |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/ | - |
dc.relation.ispartof | 2D Materials | - |
dc.rights | 2D Materials. Copyright © Institute of Physics Publishing Ltd. | - |
dc.rights | This is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI]. | - |
dc.subject | moire superlattice | - |
dc.subject | exciton | - |
dc.subject | twistronics | - |
dc.subject | strain | - |
dc.subject | 2D semiconductors | - |
dc.title | Twist versus heterostrain control of optical properties of moiré exciton minibands | - |
dc.type | Article | - |
dc.identifier.email | Zhai, D: dzhai@hku.hk | - |
dc.identifier.email | Yao, W: wangyao@hku.hk | - |
dc.identifier.authority | Yao, W=rp00827 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1088/2053-1583/ac2d16 | - |
dc.identifier.scopus | eid_2-s2.0-85118706449 | - |
dc.identifier.hkuros | 329784 | - |
dc.identifier.volume | 8 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | article no. 044016 | - |
dc.identifier.epage | article no. 044016 | - |
dc.identifier.isi | WOS:000708197200001 | - |
dc.publisher.place | United Kingdom | - |