Fractional Quantum Hall States in Bilayer Graphene Probed by Transconductance Fluctuations

Authors
Kim, YoungwookLee, Dong SuJung, SuyongSkakalova, VieraTaniguchi, T.Watanabe, K.Kim, Jun SungSmet, Jurgen H.
Issue Date
2015-11
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.15, no.11, pp.7445 - 7451
Abstract
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.
Keywords
BROKEN-SYMMETRY STATES; QUASI-PARTICLES; BERRYS PHASE; LOCALIZATION; CHARGE; EXCITATIONS; BROKEN-SYMMETRY STATES; QUASI-PARTICLES; BERRYS PHASE; LOCALIZATION; CHARGE; EXCITATIONS; Bilayer graphene; transconductance fluctuations; fractional quantum Hall states; electron-hole symmetry
ISSN
1530-6984
URI
https://pubs.kist.re.kr/handle/201004/124863
DOI
10.1021/acs.nanolett.5b02876
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KIST Article > 2015
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