Shot noise generated by graphene p-n junctions in the quantum Hall effect regime

Abstract

Owing to a linear and gapless band structure and a tunability of the charge carrier type, graphene offers a unique system to investigate transport of Dirac Fermions at p-n junctions (PNJs). In a magnetic field, combination of quantum Hall physics and the characteristic transport across PNJs leads to a fractionally quantized conductance associated with the mixing of electron-like and hole-like modes and their subsequent partitioning. The mixing and partitioning suggest that a PNJ could be used as an electronic beam-splitter. Here we report the shot noise study of the mode mixing process and demonstrate the crucial role of the PNJ length. For short PNJs, the amplitude of the noise is consistent with an electronic beam-splitter behavior, whereas, for longer PNJs, it is reduced by the energy relaxation. Remarkably, the relaxation length is much larger than typical size of mesoscopic devices, encouraging using graphene for electron quantum optics and quantum information processing.

References in corpus (13)

• Chiral tunneling and the Klein paradox in graphene
• Quantum interference and Klein tunneling in graphene heterojunctions
• Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions
• Electronic transport and quantum Hall effect in bipolar graphene p-n-p junction
• Quantum limit of heat flow across a single electronic channel
• Quantized Transport in Graphene p-n Junctions in Magnetic Field
• Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
• Disorder-induced enhancement of transport through graphene p-n junctions
• Tuning Energy Relaxation along Quantum Hall Channels
• Snake States in Graphene p-n Junctions
• Local noise in a diffusive conductor
• Graphene n-p junction in a strong magnetic field: a semiclassical study
• Gate-controlled conductance enhancement from quantum Hall channels along graphene p-n junctions

Cited by in corpus (19)

• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
• Local noise in a diffusive conductor
• Transport across twist angle domains in moiré graphene
• Magnetoconductance, Quantum Hall Effect, and Coulomb Blockade in Topological Insulator Nanocones
• Chiral interface states in graphene $p$-$n$ junctions
• Equilibration of Quantum hall edges in symmetry broken bilayer graphene
• Valley isospin of interface states in a graphene $pn$ junction in the quantum Hall regime
• Quantized conductance with non-zero shot noise as a signature of Andreev edge state
• Graphene pn-junction in a quantizing magnetic field: Conductance at intermediate disorder strength
• Enhanced shot noise at bilayer graphene -- superconductor junction
• Equilibration of quantum hall edge states and its conductance fluctuations in graphene p-n junctions
• Oscillating magnetoresistance in graphene p-n junctions at intermediate magnetic fields
• Sub-Sharvin conductance and enhanced shot noise in doped graphene
• Mode mixing induced by disorder in graphene PNP junction in a magnetic field
• Graphene $n$-$p$ junctions in the Quantum Hall regime: numerical study of incoherent scattering effects
• Interplay of filling fraction and coherence in symmetry broken graphene p-n junction
• Theory of ballistic quantum transport in presence of localized defects
• Geometric interference in a high-mobility graphene annulus p-n junction device
• Single-electron emission from degenerate quantum levels