Graphene Nanoribbons with Smooth Edges Behave as Quantum Wires
arXiv:1108.5692 · doi:10.1038/nnano.2011.138
Abstract
Graphene nanoribbons with perfect edges are predicted to exhibit interesting electronic and spintronic properties, notably quantum-confined bandgaps and magnetic edge states. However, graphene nanoribbons produced by lithography have, to date, exhibited rough edges and low-temperature transport characteristics dominated by defects, mainly variable range hopping between localized states in a transport gap near the Dirac point. Here, we report that one- and two-layer nanoribbons quantum dots made by unzipping carbon nanotubes10 exhibit well-defined quantum transport phenomena, including Coulomb blockade, Kondo effect, clear excited states up to ~20meV, and inelastic co-tunnelling. Along with signatures of intrinsic quantum-confined bandgaps and high conductivities, our data indicate that the nanoribbons behave as clean quantum wires at low temperatures, and are not dominated by defects.
To appear in Nature Nanotechnology
References in corpus (16)
- Energy Gaps in Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Graphene Nano-Ribbon Electronics
- Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect Transistors
- Spin qubits in graphene quantum dots
- Etching and Narrowing of Graphene from the Edges
- Energy gaps in etched graphene nanoribbons
- Strong Suppression of Electrical Noise in Bilayer Graphene Nano Devices
- Monovalent impurities on graphene: midgap states and migration barriers
- Conductance Quantization in Graphene Nanoribbons
- Quantum dot behavior in graphene nanoconstrictions
- Effect of edge roughness in graphene nanoribbon transistors
- Graphene nanoribbons from unzipped carbon nanotubes: atomic structures, Raman spectroscopy and electrical properties
- Transport gap in side-gated graphene constrictions
- Four-electron shell structures and an interacting two-electron system in carbon nanotube quantum dots
- Observations of two-fold shell filling and Kondo effect in a graphene nano-ribbon quantum dot device
Cited by in corpus (43)
- High Performance Single Layered WSe2 p-FETs with Chemically Doped Contacts
- Exceptional ballistic transport in epitaxial graphene nanoribbons
- Ballistic to diffusive crossover of heat flow in graphene ribbons
- Gate Defined Quantum Confinement in Suspended Bilayer Graphene
- Spintronics in MoS_2 monolayer quantum wires
- Gate defined zero- and one-dimensional confinement in bilayer graphene
- Transport in Nanoribbon Interconnects Obtained from Graphene Grown by Chemical Vapor Deposition
- Giant spin orbit interaction due to rotating magnetic fields in graphene nanoribbons
- Graphene Nanoribbon Field-Effect Transistors on Wafer-Scale Epitaxial Graphene on SiC substrates
- Experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers
- Size quantization of Dirac fermions in graphene constrictions
- Recent progresses of quantum confinement in graphene quantum dots
- Energy gaps of atomically precise armchair graphene nanoribbons
- Edge states in graphene-like systems
- Characterizing wave functions in graphene nanodevices: electronic transport through ultrashort graphene constrictions on a boron nitride substrate
- Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
- Variability Effects in Graphene: Challenges and Opportunities for Device Engineering and Applications
- Interplay between sublattice and spin symmetry breaking in graphene
- Symmetries and the conductance of graphene nanoribbons with long-range disorder
- Bound States in Nanoscale Graphene Quantum Dots in a Continuous Graphene Sheet
- Crossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons
- Ab initio quantum transport through armchair graphene nanoribbons: Streamlines in the current density
- Single-electron Transport in Graphene-like Nanostructures
- Dissipative Transport in Rough Edge Graphene Nanoribbon Tunnel Transistors
- Finite-difference method for transport of two-dimensional massless Dirac fermions in a ribbon geometry
- Graphene nanoribbons subject to gentle bends
- Giant Quasiparticle Bandgap Modulation in Graphene Nanoribbons Supported on Weakly Interacting Surfaces
- Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots
- Electronic triple-dot transport through a bilayer graphene island with ultrasmall constrictions
- Field-induced Confined States in Graphene
- From diffusive to ballistic transport in etched graphene constrictions and nanoribbons
- Wigner localization in a graphene quantum dot with a mass gap
- Reducing disorder in graphene nanoribbons by chemical edge modification
- Negative quantum capacitance in graphene nanoribbons with lateral gates
- Bilayer Graphene Quantum Dot Defined by Topgates
- First-principles study of the terahertz third-order nonlinear response of metallic armchair graphene nanoribbons
- Quantum Size Effects in the Terahertz Nonlinear Response of Metallic Armchair Graphene Nanoribbons
- Creating and probing wide-bandgap nanoribbon-like structures in a continuous metallic graphene sheet
- Tailoring 10 nm Scale Suspended Graphene Junctions and Quantum Dots
- Crossover from Room-temperature Double-channel Ballistic Transport to Single-channel Ballistic Transport in Zigzag Graphene Nanoribbons
- Raman spectroscopy on mechanically exfoliated pristine graphene ribbons
- Conductance recovery and spin polarization in boron and nitrogen codoped graphene nanoribbons
- Magnetic-field-assisted electron confinement and valley splitting in strained graphene