Andreev reflection of fractional quantum Hall quasiparticles

Abstract

Electron correlation in a quantum many-body state appears as peculiar scattering behaviour at its boundary, symbolic of which is Andreev reflection at a metal-superconductor interface. Despite being fundamental in nature, dictated by the charge conservation law, however, the process has had no analogues outside the realm of superconductivity so far. Here, we report the observation of an Andreev-like process originating from a topological quantum many-body effect instead of superconductivity. A narrow junction between fractional and integer quantum Hall states shows a two-terminal conductance exceeding that of the constituent fractional state. This remarkable behaviour, while theoretically predicted more than two decades ago but not detected to date, can be interpreted as Andreev reflection of fractionally charged quasiparticles. The observed fractional quantum Hall Andreev reflection provides a fundamental picture that captures microscopic charge dynamics at the boundaries of topological quantum many-body states.

arXiv comment13 pages, 4 figures, and supplementary information

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Cited by in corpus (26)

• Andreev reflection in the fractional quantum Hall state
• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
• Contacts, equilibration, and interactions in fractional quantum Hall edge transport
• Universal chiral Luttinger liquid behavior in a graphene fractional quantum Hall point contact
• Topological phase diagrams of exactly solvable non-Hermitian interacting Kitaev chains
• Quasiparticle Andreev scattering in the $\nu =1/3$ fractional quantum Hall regime
• Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase
• Exact Dirac-Bogoliubov-de Gennes Dynamics for Inhomogeneous Quantum Liquids
• Delta-T noise for fractional quantum Hall states at different filling factor
• Localization and conductance in fractional quantum Hall edges
• Non-contact Andreev reflection as a direct probe of superconductivity on the atomic scale
• Minimal alternating current injection into carbon nanotubes
• Coherent electron splitting in interacting chiral edge channels
• Quasiparticle Andreev reflection in the Laughlin fractions of the fractional quantum Hall effect
• Levitons in correlated nano-scale systems
• Drag conductance induced by neutral-mode localization in fractional quantum Hall junctions
• Topological Thouless pumping in arrays of coupled spin chains
• Correlated two-Leviton states in the fractional quantum Hall regime
• Field Theoretic Aspects of Condensed Matter Physics: An Overview
• Andreev-like Reflection in the Pfaffian Fractional Quantum Hall Effect
• Fractional-statistics-induced entanglement from Andreev-like tunneling
• Overlap of parafermionic zero modes at a finite distance
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• Electron-hole coherence in core-shell nanowires with partial proximity induced superconductivity
• Collapse of edge reconstruction in compressible Quantum Hall fluid within filling fraction range 2/3 to 1