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Although h-BN with unique dielectric properties has been widely used as an important substrate for graphene, so far there is no experimental report of plasmarons in graphene\/h-BN yet. Here, we report direct experimental observation of plasmaron dispersion in graphene\/h-BN heterostructures through angle-resolved photoemission spectroscopy (ARPES) measurements upon in situ electron doping. Characteristic diamond-shaped dispersion is observed near the Dirac cone in both 0\u00b0 (aligned) and 13.5\u00b0 (twisted) graphene\/h-BN, and the electron-electron interaction strength <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\alpha }_{ee}^{* }$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msubsup>\n                    <mml:mrow>\n                      <mml:mi>\u03b1<\/mml:mi>\n                    <\/mml:mrow>\n                    <mml:mrow>\n                      <mml:mi>e<\/mml:mi>\n                      <mml:mi>e<\/mml:mi>\n                    <\/mml:mrow>\n                    <mml:mrow>\n                      <mml:mo>*<\/mml:mo>\n                    <\/mml:mrow>\n                  <\/mml:msubsup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> is extracted to be <jats:inline-formula><jats:alternatives><jats:tex-math>$${\\alpha }_{ee}^{* }\\approx 0.9\\pm 0.1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msubsup>\n                      <mml:mrow>\n                        <mml:mi>\u03b1<\/mml:mi>\n                      <\/mml:mrow>\n                      <mml:mrow>\n                        <mml:mi>e<\/mml:mi>\n                        <mml:mi>e<\/mml:mi>\n                      <\/mml:mrow>\n                      <mml:mrow>\n                        <mml:mo>*<\/mml:mo>\n                      <\/mml:mrow>\n                    <\/mml:msubsup>\n                    <mml:mo>\u2248<\/mml:mo>\n                    <mml:mn>0.9<\/mml:mn>\n                    <mml:mo>\u00b1<\/mml:mo>\n                    <mml:mn>0.1<\/mml:mn>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, highlighting the important role of electron-electron interaction. Our results suggest graphene\/h-BN as an ideal platform for investigating strong electron-electron interaction with weak dielectric screening, and lays fundamental physics for gate-tunable nano-electronics and nano-plasmonics.<\/jats:p>","DOI":"10.1038\/s41535-021-00386-7","type":"journal-article","created":{"date-parts":[[2021,10,1]],"date-time":"2021-10-01T11:02:54Z","timestamp":1633086174000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene\/h-BN heterostructure"],"prefix":"10.1038","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0993-8949","authenticated-orcid":false,"given":"Hongyun","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuopei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eryin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaobo","family":"Lu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changhua","family":"Bao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5656-8867","authenticated-orcid":false,"given":"Ke","family":"Deng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoxiong","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4518-3632","authenticated-orcid":false,"given":"Wei","family":"Yao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4919-4796","authenticated-orcid":false,"given":"Guorui","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexei V.","family":"Fedorov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7645-1631","authenticated-orcid":false,"given":"Jonathan D.","family":"Denlinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3701-8119","authenticated-orcid":false,"given":"Kenji","family":"Watanabe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1467-3105","authenticated-orcid":false,"given":"Takashi","family":"Taniguchi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangyu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9841-8610","authenticated-orcid":false,"given":"Shuyun","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,10,1]]},"reference":[{"key":"386_CR1","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1103\/RevModPhys.81.109","volume":"81","author":"AH Castro Neto","year":"2009","unstructured":"Castro Neto, A. 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