Weak antilocalization of composite fermions in graphene

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Weak antilocalization of composite fermions in graphene. / Laitinen, Antti; Kumar, Manohar; Hakonen, Pertti J.

julkaisussa: Physical Review B, Vuosikerta 97, Nro 7, 075113, 08.02.2018, s. 1-5.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Bibtex - Lataa

@article{525003f7fd3b480ba71a3faa9d12acdc,
title = "Weak antilocalization of composite fermions in graphene",
abstract = "We demonstrate experimentally that composite fermions in monolayer graphene display weak antilocalization. Our experiments deal with fractional quantum Hall (FQH) states in high-mobility, suspended graphene Corbino disks in the vicinity of ν=1/2. We find a strong temperature dependence of conductivity σ away from half filling, which is consistent with the expected electron-electron interaction-induced gaps in the FQH state. At half filling, however, the temperature dependence of conductivity σ(T) becomes quite weak, as anticipated for a Fermi sea of composite fermions, and we find a logarithmic dependence of σ on T. The sign of this quantum correction coincides with the weak antilocalization of graphene composite fermions, indigenous to chiral Dirac particles.",
author = "Antti Laitinen and Manohar Kumar and Hakonen, {Pertti J.}",
note = "| openaire: EC/H2020/670743/EU//QuDeT",
year = "2018",
month = "2",
day = "8",
doi = "10.1103/PhysRevB.97.075113",
language = "English",
volume = "97",
pages = "1--5",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "7",

}

RIS - Lataa

TY - JOUR

T1 - Weak antilocalization of composite fermions in graphene

AU - Laitinen, Antti

AU - Kumar, Manohar

AU - Hakonen, Pertti J.

N1 - | openaire: EC/H2020/670743/EU//QuDeT

PY - 2018/2/8

Y1 - 2018/2/8

N2 - We demonstrate experimentally that composite fermions in monolayer graphene display weak antilocalization. Our experiments deal with fractional quantum Hall (FQH) states in high-mobility, suspended graphene Corbino disks in the vicinity of ν=1/2. We find a strong temperature dependence of conductivity σ away from half filling, which is consistent with the expected electron-electron interaction-induced gaps in the FQH state. At half filling, however, the temperature dependence of conductivity σ(T) becomes quite weak, as anticipated for a Fermi sea of composite fermions, and we find a logarithmic dependence of σ on T. The sign of this quantum correction coincides with the weak antilocalization of graphene composite fermions, indigenous to chiral Dirac particles.

AB - We demonstrate experimentally that composite fermions in monolayer graphene display weak antilocalization. Our experiments deal with fractional quantum Hall (FQH) states in high-mobility, suspended graphene Corbino disks in the vicinity of ν=1/2. We find a strong temperature dependence of conductivity σ away from half filling, which is consistent with the expected electron-electron interaction-induced gaps in the FQH state. At half filling, however, the temperature dependence of conductivity σ(T) becomes quite weak, as anticipated for a Fermi sea of composite fermions, and we find a logarithmic dependence of σ on T. The sign of this quantum correction coincides with the weak antilocalization of graphene composite fermions, indigenous to chiral Dirac particles.

UR - http://www.scopus.com/inward/record.url?scp=85042153613&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.97.075113

DO - 10.1103/PhysRevB.97.075113

M3 - Article

VL - 97

SP - 1

EP - 5

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 7

M1 - 075113

ER -

ID: 18367654