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Here we show, based on polarization resolved and low temperature magneto-optical spectroscopy experiments, that the conservation of the total angular momentum in these systems leads to a very efficient exciton-phonon interaction when the coupling is mediated through chiral phonons. We identify these phonons as the \u0393 point E\u201d modes which despite carrying angular momentum \u00b1 1 are able to induce an excitonic spin-flip of <jats:inline-formula>\n                     <jats:tex-math\/>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mo>\u2213<\/mml:mo>\n                        <mml:mn>2<\/mml:mn>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"tdmaba567ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> thanks to the C<jats:sub>3<\/jats:sub> symmetry. These experiments reveal the crucial role of electron-phonon interaction in the carrier dynamics of group 6 transition metal dichalcogenides.<\/jats:p>","DOI":"10.1088\/2053-1583\/aba567","type":"journal-article","created":{"date-parts":[[2020,7,13]],"date-time":"2020-07-13T22:31:20Z","timestamp":1594679480000},"page":"041002","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":38,"title":["Flipping exciton angular momentum with chiral phonons in MoSe<sub>2<\/sub>\/WSe<sub>2<\/sub> heterobilayers"],"prefix":"10.1088","volume":"7","author":[{"given":"A","family":"Delhomme","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D","family":"Vaclavkova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5798-0431","authenticated-orcid":false,"given":"A","family":"Slobodeniuk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Orlita","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Potemski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2302-3099","authenticated-orcid":false,"given":"D M","family":"Basko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3701-8119","authenticated-orcid":false,"given":"K","family":"Watanabe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Taniguchi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D","family":"Mauro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C","family":"Barreteau","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3536-4771","authenticated-orcid":false,"given":"E","family":"Giannini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0974-3620","authenticated-orcid":false,"given":"A F","family":"Morpurgo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1966-4435","authenticated-orcid":false,"given":"N","family":"Ubrig","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9615-8739","authenticated-orcid":false,"given":"C","family":"Faugeras","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2020,8,14]]},"reference":[{"key":"tdmaba567bib1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.90.021001","article-title":"Coll.: Excitons in atomically thin transition metal dichalcogenides","volume":"90","author":"Wang","year":"2018","journal-title":"Rev. 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