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Twist-tailoring Coulomb correlations in van der Waals homobilayers
Nature Communications, Volume: 11, Issue: 1
Swansea University Author:
Roland Gillen
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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...
Published in: | Nature Communications |
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ISSN: | 2041-1723 |
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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. Our work opens the possibility of tailoring quasiparticles in search of unexplored phases of matter in a broad range of van der Waals heterostructures.</abstract><type>Journal Article</type><journal>Nature Communications</journal><volume>11</volume><journalNumber>1</journalNumber><paginationStart/><paginationEnd/><publisher>Springer Science and Business Media LLC</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic>2041-1723</issnElectronic><keywords/><publishedDay>1</publishedDay><publishedMonth>5</publishedMonth><publishedYear>2020</publishedYear><publishedDate>2020-05-01</publishedDate><doi>10.1038/s41467-020-16069-z</doi><url/><notes/><college>COLLEGE NANME</college><department>Aerospace, Civil, Electrical, and Mechanical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>ACEM</DepartmentCode><institution>Swansea University</institution><apcterm>Another institution paid the OA fee</apcterm><funders>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). 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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 |
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Journal article |
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Nature Communications |
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11 |
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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 |
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Faculty of Science and Engineering |
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Faculty of Science and Engineering |
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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 |
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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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1807290058307272704 |
score |
11.02167 |