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Possessing extraordinary tunability that stems from the intricate interplay of spin, valley, and orbital degrees of freedom, few-layer graphene stands out as an ideal platform for studying the FQH effect. Here we report the observation of the\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mi>\u03bd<\/mml:mi>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>7<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>2<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    FQH state on the hole side of Bernal-stacked trilayer graphene unilaterally encapsulated with hexagonal boron nitride\u2014the first realization of this state on the hole side of pristine trilayer graphene. In contrast to recently reported electron-side even-denominator states hosted in the monolayer-like\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mi>N<\/mml:mi>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>0<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    orbital, the\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mi>\u03bd<\/mml:mi>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>7<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>2<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    state emerges in the bilayer-like\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mrow>\n                            <mml:msub>\n                              <mml:mi>N<\/mml:mi>\n                              <mml:mrow>\n                                <mml:mtext>B<\/mml:mtext>\n                              <\/mml:mrow>\n                            <\/mml:msub>\n                          <\/mml:mrow>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>1<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    orbital near its crossing with the\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mrow>\n                            <mml:msub>\n                              <mml:mi>N<\/mml:mi>\n                              <mml:mrow>\n                                <mml:mtext>B<\/mml:mtext>\n                              <\/mml:mrow>\n                            <\/mml:msub>\n                          <\/mml:mrow>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>0<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    level, and exhibits a transport activation gap of\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mrow>\n                            <mml:msub>\n                              <mml:mi mathvariant=\"normal\">\u0394<\/mml:mi>\n                              <mml:mrow>\n                                <mml:mrow>\n                                  <mml:mtext>tr<\/mml:mtext>\n                                <\/mml:mrow>\n                              <\/mml:mrow>\n                            <\/mml:msub>\n                          <\/mml:mrow>\n                          <mml:mo>=<\/mml:mo>\n                          <mml:mn>45.6<\/mml:mn>\n                          <mml:mo>\u00b1<\/mml:mo>\n                          <mml:mn>8.4<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    K, nearly two orders of magnitude larger than its electron-side counterparts. This value, obtained from Arrhenius analysis of the temperature-dependent residual resistance, is a conservative lower bound, as the analysis is limited by the residual-resistance floor. Our results suggest that few-layer graphene is an ideal platform for studying low-dimensional correlation states.\n                  <\/jats:p>","DOI":"10.1088\/1361-6528\/aeae47","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T22:49:09Z","timestamp":1790808549000},"page":"415001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Observation of a hole-side\n                    <i>v<\/i>\n                    = 7\/2 fractional quantum hall state in trilayer graphene"],"prefix":"10.1088","volume":"37","author":[{"given":"Boyuan","family":"Wei","sequence":"first","affiliation":[{"name":"National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fengyi","family":"Guo","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7582-4096","authenticated-orcid":true,"given":"Zheng","family":"Dai","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2916-3394","authenticated-orcid":true,"given":"Shuai","family":"Zhang","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University"},{"name":"Institute of Atom Manufacturing, Nanjing University"},{"name":"Jiangsu Provincal Key Laboratory of Manufacturing, Nanjing Institute of Atomic Scale Manufacturing"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Ying","sequence":"additional","affiliation":[{"name":"Jiangsu Provincal Key Laboratory of Manufacturing, Nanjing Institute of Atomic Scale Manufacturing"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuanying","family":"Xi","sequence":"additional","affiliation":[{"name":"Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2354-0806","authenticated-orcid":true,"given":"Fengqi","family":"Song","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University"},{"name":"Institute of Atom Manufacturing, Nanjing University"},{"name":"Jiangsu Provincal Key Laboratory of Manufacturing, Nanjing Institute of Atomic Scale Manufacturing"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,10,12]]},"reference":[{"key":"nanoaeae47bib1","doi-asserted-by":"publisher","first-page":"1559","DOI":"10.1103\/PhysRevLett.48.1559","type":"journal-article","volume":"48","author":"Tsui","year":"1982","journal-title":"Phys. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2026-08-02","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-09-30","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-10-12","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}