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Prog. Phys."],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Two-dimensional electron systems (2DESs) confined to wide GaAs quantum wells (QWs) provide a unique platform to study exotic fractional quantum Hall states (FQHSs) because the 2DES has a bilayer charge distribution with significant interlayer tunneling. Precise control over the 2DES density allows the tuning of the interlayer tunneling over a wide range. Here, we present our discovery of new even-denominator FQHSs in the lowest Landau level (orbital index\n                    <jats:italic>N<\/jats:italic>\n                    = 0) at filling factors\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>3<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>4<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    and 5\/4 in an ultrahigh-quality 2DES confined to a 72.5 nm-wide GaAs QW. The ground states at\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>3<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>4<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    and 5\/4 both evolve from composite fermion (CF) Fermi seas to FQHSs as the density is raised so that interlayer tunneling is sufficiently reduced and the 2DES becomes two-component, signaled by the behavior of the FQHSs flanking\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>3<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>4<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    and 5\/4. The two-component nature 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>3<\/mml:mn>\n                          <mml:mrow>\n                            <mml:mo>\/<\/mml:mo>\n                          <\/mml:mrow>\n                          <mml:mn>4<\/mml:mn>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    and 5\/4 FQHSs is also evident from their extreme sensitivity to the bilayer charge distribution symmetry: both states disappear quickly when the charge distribution is made asymmetric by only\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:mo>\u2243<\/mml:mo>\n                          <mml:mn>2<\/mml:mn>\n                          <mml:mi mathvariant=\"normal\">%<\/mml:mi>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    . We find a natural explanation for the 3\/4 and 5\/4 FQHSs in terms of two states linked by particle-hole symmetry, and using Scarola-Jain bilayer CF framework which is a generalization of the well-known, two-component, Halperin state (\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:msub>\n                            <mml:mi mathvariant=\"normal\">\u03a8<\/mml:mi>\n                            <mml:mrow>\n                              <mml:mn>331<\/mml:mn>\n                            <\/mml:mrow>\n                          <\/mml:msub>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    state). Our observations elucidate the crucial role of competing energy and length scales in wide QW in stabilizing new ground states.\n                  <\/jats:p>","DOI":"10.1088\/1361-6633\/aea0fe","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T22:50:49Z","timestamp":1788303049000},"page":"090503","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Observation of even-denominator fractional quantum Hall states at \u03bd = 3\/4 and 5\/4 in the lowest Landau level"],"prefix":"10.1088","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-1114-5988","authenticated-orcid":true,"given":"Siddharth","family":"Kumar Singh","sequence":"first","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-0059-8345","authenticated-orcid":true,"given":"Chengyu","family":"Wang","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5350-3443","authenticated-orcid":true,"given":"Adbhut","family":"Gupta","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirk W","family":"Baldwin","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Loren N","family":"Pfeiffer","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mansour","family":"Shayegan","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,9,25]]},"reference":[{"key":"ropaea0febib1","doi-asserted-by":"publisher","first-page":"199","DOI":"10.1103\/PhysRevLett.63.199","type":"journal-article","article-title":"Composite-fermion approach for the fractional quantum Hall effect","volume":"63","author":"Jain","year":"1989a","journal-title":"Phys. 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