Measurement of the 1⁄4 1=3 Fractional Quantum Hall Energy Gap in Suspended Graphene
نویسندگان
چکیده
We report on magnetotransport measurements of multiterminal suspended graphene devices. Fully developed integer quantum Hall states appear in magnetic fields as low as 2 T. At higher fields the formation of longitudinal resistance minima and transverse resistance plateaus are seen corresponding to fractional quantum Hall states, most strongly for 1⁄4 1=3. By measuring the temperature dependence of these resistance minima, the energy gap for the 1=3 fractional state in graphene is determined to be at 20 K at 14 T.
منابع مشابه
Measurement of the ν=1/3 fractional quantum hall energy gap in suspended graphene.
We report on magnetotransport measurements of multiterminal suspended graphene devices. Fully developed integer quantum Hall states appear in magnetic fields as low as 2 T. At higher fields the formation of longitudinal resistance minima and transverse resistance plateaus are seen corresponding to fractional quantum Hall states, most strongly for ν=1/3. By measuring the temperature dependence o...
متن کاملFractional quantum Hall effect in suspended graphene: Transport coefficients and electron interaction strength
Citation Abanin, D. A. et al. " Fractional quantum Hall effect in suspended graphene: Transport coefficients and electron interaction strength. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benef...
متن کاملEdge and bulk components of lowest-Landau-level orbitals, correlated fractional quantum Hall effect incompressible states, and insulating behavior in finite graphene samples
Many-body calculations of the total energy of interacting Dirac electrons in finite graphene samples exhibit joint occurrence of cusps at angular momenta corresponding to fractional fillings characteristic of formation of incompressible gapped correlated states =1 /3, in particular and opening of an insulating energy gap that increases with the magnetic field at the Dirac point, in corresponden...
متن کاملCrossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons.
Suspended graphene nanoribbons formed during current annealing of suspended graphene flakes have been investigated experimentally. Transport measurements show the opening of a transport gap around charge neutrality due to the formation of "Coulomb islands", coexisting with quantum Hall conductance plateaus appearing at moderate values of the magnetic field B. Upon increasing B, the transport ga...
متن کاملUnconventional sequence of fractional quantum Hall states in suspended graphene.
Graphene provides a rich platform to study many-body effects, owing to its massless chiral charge carriers and the fourfold degeneracy arising from their spin and valley degrees of freedom. We use a scanning single-electron transistor to measure the local electronic compressibility of suspended graphene, and we observed an unusual pattern of incompressible fractional quantum Hall states that fo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011