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Twist-tailoring Coulomb correlations in van der Waals homobilayers

Philipp Merkl, Fabian Mooshammer, Samuel Brem Orcid Logo, Anna Girnghuber, Kai-Qiang Lin Orcid Logo, Leonard Weigl, Marlene Liebich, Chaw-Keong Yong, Roland Gillen Orcid Logo, Janina Maultzsch Orcid Logo, John M. Lupton, Ermin Malic Orcid Logo, Rupert Huber

Nature Communications, Volume: 11, Issue: 1

Swansea University Author: Roland Gillen Orcid Logo

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DOI (Published version): 10.1038/s41467-020-16069-z

Abstract

The recent discovery of artificial phase transitions induced by stacking monolayer materials at magic twist angles represents a paradigm shift for solid state physics. Twist-induced changes of the single-particle band structure have been studied extensively, yet a precise understanding of the underl...

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Published in: Nature Communications
ISSN: 2041-1723
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa66661
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Here we reveal in experiment and theory, how the twist angle alone affects the Coulomb-induced internal structure and mutual interactions of excitons. In homobilayers of WSe2, we trace the internal 1s–2p resonance of excitons with phase-locked mid-infrared pulses as a function of the twist angle. Remarkably, the exciton binding energy is renormalized by up to a factor of two, their lifetime exhibits an enhancement by more than an order of magnitude, and the exciton-exciton interaction is widely tunable. 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This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID, 314695032—SFB 1277 (Subprojects A05 and B03). 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spelling v2 66661 2024-06-11 Twist-tailoring Coulomb correlations in van der Waals homobilayers 8fd99815709ad1e4ae52e27f63257604 0000-0002-7913-0953 Roland Gillen Roland Gillen true false 2024-06-11 ACEM The recent discovery of artificial phase transitions induced by stacking monolayer materials at magic twist angles represents a paradigm shift for solid state physics. Twist-induced changes of the single-particle band structure have been studied extensively, yet a precise understanding of the underlying Coulomb correlations has remained challenging. Here we reveal in experiment and theory, how the twist angle alone affects the Coulomb-induced internal structure and mutual interactions of excitons. In homobilayers of WSe2, we trace the internal 1s–2p resonance of excitons with phase-locked mid-infrared pulses as a function of the twist angle. Remarkably, the exciton binding energy is renormalized by up to a factor of two, their lifetime exhibits an enhancement by more than an order of magnitude, and the exciton-exciton interaction is widely tunable. Our work opens the possibility of tailoring quasiparticles in search of unexplored phases of matter in a broad range of van der Waals heterostructures. Journal Article Nature Communications 11 1 Springer Science and Business Media LLC 2041-1723 1 5 2020 2020-05-01 10.1038/s41467-020-16069-z COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University Another institution paid the OA fee We thank Martin Furthmeier for technical assistance and Jens Kunstmann for fruitful discussions. This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID, 314695032—SFB 1277 (Subprojects A05 and B03). The Chalmers group acknowledges funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 881603 (Graphene Flagship) as well as from the Swedish Research Council (VR, project number 2018-00734). 2024-08-13T17:21:41.7781569 2024-06-11T12:48:37.2075151 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering Philipp Merkl 1 Fabian Mooshammer 2 Samuel Brem 0000-0001-8823-1302 3 Anna Girnghuber 4 Kai-Qiang Lin 0000-0003-3044-457x 5 Leonard Weigl 6 Marlene Liebich 7 Chaw-Keong Yong 8 Roland Gillen 0000-0002-7913-0953 9 Janina Maultzsch 0000-0002-6088-2442 10 John M. Lupton 11 Ermin Malic 0000-0003-1434-9003 12 Rupert Huber 13 66661__31103__5bf7ad288faf4c068e477ce2d71975bc.pdf 66661.VoR.pdf 2024-08-13T17:08:02.9161385 Output 1202929 application/pdf Version of Record true This article is licensed under a Creative Commons Attribution 4.0 International License. true eng http://creativecommons.org/licenses/by/4.0/
title Twist-tailoring Coulomb correlations in van der Waals homobilayers
spellingShingle Twist-tailoring Coulomb correlations in van der Waals homobilayers
Roland Gillen
title_short Twist-tailoring Coulomb correlations in van der Waals homobilayers
title_full Twist-tailoring Coulomb correlations in van der Waals homobilayers
title_fullStr Twist-tailoring Coulomb correlations in van der Waals homobilayers
title_full_unstemmed Twist-tailoring Coulomb correlations in van der Waals homobilayers
title_sort Twist-tailoring Coulomb correlations in van der Waals homobilayers
author_id_str_mv 8fd99815709ad1e4ae52e27f63257604
author_id_fullname_str_mv 8fd99815709ad1e4ae52e27f63257604_***_Roland Gillen
author Roland Gillen
author2 Philipp Merkl
Fabian Mooshammer
Samuel Brem
Anna Girnghuber
Kai-Qiang Lin
Leonard Weigl
Marlene Liebich
Chaw-Keong Yong
Roland Gillen
Janina Maultzsch
John M. Lupton
Ermin Malic
Rupert Huber
format Journal article
container_title Nature Communications
container_volume 11
container_issue 1
publishDate 2020
institution Swansea University
issn 2041-1723
doi_str_mv 10.1038/s41467-020-16069-z
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering
document_store_str 1
active_str 0
description The recent discovery of artificial phase transitions induced by stacking monolayer materials at magic twist angles represents a paradigm shift for solid state physics. Twist-induced changes of the single-particle band structure have been studied extensively, yet a precise understanding of the underlying Coulomb correlations has remained challenging. Here we reveal in experiment and theory, how the twist angle alone affects the Coulomb-induced internal structure and mutual interactions of excitons. In homobilayers of WSe2, we trace the internal 1s–2p resonance of excitons with phase-locked mid-infrared pulses as a function of the twist angle. Remarkably, the exciton binding energy is renormalized by up to a factor of two, their lifetime exhibits an enhancement by more than an order of magnitude, and the exciton-exciton interaction is widely tunable. Our work opens the possibility of tailoring quasiparticles in search of unexplored phases of matter in a broad range of van der Waals heterostructures.
published_date 2020-05-01T17:21:44Z
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