Kim, Youngwook Lee, Dong Su Jung, Suyong Skakalova, Viera Taniguchi, T. Watanabe, K. Kim, Jun Sung Smet, Jurgen H. 2024-01-20T06:00:53Z 2024-01-20T06:00:53Z 2021-08-31 2015-11 1530-6984 https://pubs.kist.re.kr/handle/201004/124863 We have investigated fractional quantum Hall (QH) states in Bernal-stacked bilayer graphene using trans-conductance fluctuation measurements. A variety of odd-denominator fractional QH states with nu(QH) --> nu(QH) + 2 symmetry, as previously reported, are observed. However, surprising is that also particle-hole symmetric states are clearly resolved in the same measurement set. We attribute their emergence to the reversal of orbital states in the octet level scheme induced by a strong local charge imbalance, which can be captured by the transconductance fluctuations. Also the even-denominator fractional QH state at filling -1/2 is observed. However, contrary to a previous study on a suspended graphene layer [Ki et al. Nano Lett. 2014, 14, 2135], the particle-hole symmetric state at filling 1/2 is detected as well. These observations suggest that the stability of both odd and even denominator fractional QH states is very sensitive to local transverse electric fields in bilayer graphene. English AMER CHEMICAL SOC BROKEN-SYMMETRY STATES QUASI-PARTICLES BERRYS PHASE LOCALIZATION CHARGE EXCITATIONS Fractional Quantum Hall States in Bilayer Graphene Probed by Transconductance Fluctuations Article 10.1021/acs.nanolett.5b02876 1 NANO LETTERS, v.15, no.11, pp.7445 - 7451 NANO LETTERS 15 11 7445 7451 scie scopus 000364725400041 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article BROKEN-SYMMETRY STATES QUASI-PARTICLES BERRYS PHASE LOCALIZATION CHARGE EXCITATIONS Bilayer graphene transconductance fluctuations fractional quantum Hall states electron-hole symmetry