Benoît Grémaud
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View article: Probing anyon statistics on a single-edge loop in the fractional quantum Hall regime
Probing anyon statistics on a single-edge loop in the fractional quantum Hall regime Open
We propose a setup to directly measure the anyonic statistical angle on a single edge of a fractional quantum Hall system, without requiring independent knowledge of non-universal parameters. We consider a Laughlin edge state bent into a c…
View article: Disorder and robustness of superconductivity on the quasi-one-dimensional flat-band Creutz lattice
Disorder and robustness of superconductivity on the quasi-one-dimensional flat-band Creutz lattice Open
We study the interplay between on-site disorder and fermion pairing on the quasi one-dimensional flat band Creutz lattice. Both disorder and flat bands localize particles, but an attractive interaction results in pair formation and delocal…
View article: Time-domain braiding of anyons
Time-domain braiding of anyons Open
Anyons are quasiparticles that keep a robust memory of particle exchanges via a braiding phase factor. When an anyon excitation is emitted toward a quantum point contact (QPC) in a fractional quantum Hall (FQH) fluid, this memory translate…
View article: Magnetic Phases and Zone-Folded Phonons in a Frustrated van der Waals Magnet
Magnetic Phases and Zone-Folded Phonons in a Frustrated van der Waals Magnet Open
2D magnetic materials have attracted extensive research interest due to their potential application in nanospintronics, optospintronics, and magnonics. Ferromagnetic- and antiferromagnetic-layered materials have been demonstrated and succe…
View article: Disorder and the Robustness of Superconductivity on the Flat Band
Disorder and the Robustness of Superconductivity on the Flat Band Open
We study the interplay between on-site disorder and fermion pairing on the quasi one-dimensional flat band Creutz lattice. Both disorder and flat bands localize particles, but an attractive interaction results in pair formation and delocal…
View article: Photoassisted shot noise probes multiple charge carriers in quantum Hall edges
Photoassisted shot noise probes multiple charge carriers in quantum Hall edges Open
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View article: Anyon braiding on the single edge of a fractional quantum Hall state
Anyon braiding on the single edge of a fractional quantum Hall state Open
Anyons are quasiparticles with fractional statistics, bridging between fermions and bosons. We propose an experimental setup to measure the statistical angle of topological anyons emitted from a quantum point contact (QPC) source. The setu…
View article: Photo-assisted shot noise probes multiple charge carriers in quantum Hall edges
Photo-assisted shot noise probes multiple charge carriers in quantum Hall edges Open
Fractional charges in the fractional quantum Hall effect were first observed via DC shot noise measurements of anyons tunneling at a quantum point contact (QPC). However, in scenarios with simultaneous tunneling of different types of charg…
View article: Periodic source of energy-entangled electrons in helical states coupled to a BCS superconductor
Periodic source of energy-entangled electrons in helical states coupled to a BCS superconductor Open
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View article: Periodic source of energy-entangled electrons in helical states coupled to a BCS superconductor
Periodic source of energy-entangled electrons in helical states coupled to a BCS superconductor Open
We propose a source of purely electronic energy-entangled states implemented in a solid-state system with potential applications in quantum information protocols based on electron flying qubits. The proposed device relies on the standard t…
View article: Finite Width of Anyons Changes Their Braiding Signature
Finite Width of Anyons Changes Their Braiding Signature Open
Anyons are particles intermediate between fermions and bosons, characterized by a nontrivial exchange phase, yielding remarkable braiding statistics. Recent experiments have shown that anyonic braiding has observable consequences on edge t…
View article: Levitons in correlated nano-scale systems
Levitons in correlated nano-scale systems Open
In this short review (written to celebrate David Campbell’s 80th birthday), we provide a theoretical description of quantum transport in nanoscale systems in the presence of single-electron excitations generated by Lorentzian voltage drive…
View article: Momentum-space signatures of the Anderson transition in a symplectic, two-dimensional, disordered ultracold gas
Momentum-space signatures of the Anderson transition in a symplectic, two-dimensional, disordered ultracold gas Open
We study Anderson localization in two-dimensional, disordered, spin-orbit systems belonging to the symplectic symmetry class using momentum-space signatures such as the coherent backscattering antipeak and the coherent forward-scattering p…
View article: Current and shot noise in a normal metal-superconductor junction driven by spin-dependent periodic pulse sequence
Current and shot noise in a normal metal-superconductor junction driven by spin-dependent periodic pulse sequence Open
Andreev reflection is a fundamental transport process occurring at the junction between a normal metal and a superconductor (a N-S junction), when an incident electron from the normal side can only be transmitted in the superconductor as a…
View article: Finite width of anyons changes their braiding signature
Finite width of anyons changes their braiding signature Open
Anyons are particles intermediate between fermions and bosons, characterized by a nontrivial exchange phase, yielding remarkable braiding statistics. Recent experiments have shown that anyonic braiding has observable consequences on edge t…
View article: Photoassisted current in the fractional quantum Hall effect as a probe of the quasiparticle operator scaling dimension
Photoassisted current in the fractional quantum Hall effect as a probe of the quasiparticle operator scaling dimension Open
We study photo-assisted transport for the edge states of a two dimensional\nelectron gas in the fractional quantum Hall regime, pinched by a single quantum\npoint contact. We provide a general expression of the photo-assisted current\nusin…
View article: Correlated two-Leviton states in the fractional quantum Hall regime
Correlated two-Leviton states in the fractional quantum Hall regime Open
We consider a two-dimensional electron system in the Laughlin sequence of the fractional quantum Hall regime to investigate the effect of strong correlations on the mutual interaction between two Levitons, single-electron excitations gener…
View article: Nonreciprocal charge transport and subharmonic structure in voltage-biased Josephson diodes
Nonreciprocal charge transport and subharmonic structure in voltage-biased Josephson diodes Open
We study charge transport in voltage-biased single-channel junctions involving helical superconductors with finite Cooper pair momentum. For a Josephson junction, the equilibrium current-phase relation shows a superconducting diode effect:…
View article: Approaching ideal rectification in superconducting diodes through multiple Andreev reflections
Approaching ideal rectification in superconducting diodes through multiple Andreev reflections Open
We analyze the rectification properties of voltage-biased Josephson junctions exhibiting the superconducting diode effect. Taking into account multiple Andreev reflection (MAR) processes in our scattering theory, we consider a short weak l…
View article: Colored delta-T noise in Fractional Quantum Hall liquids
Colored delta-T noise in Fractional Quantum Hall liquids Open
Photons are emitted or absorbed by a nano-circuit under both equilibrium and non-equilibrium situations. Here, we focus on the non-equilibrium situation arising due to a temperature difference between the leads of a quantum point contact, …
View article: Anyonic Statistics Revealed by the Hong-Ou-Mandel Dip for Fractional Excitations
Anyonic Statistics Revealed by the Hong-Ou-Mandel Dip for Fractional Excitations Open
The fractional quantum Hall effect (FQHE) is known to host anyons, quasiparticles whose statistics is intermediate between bosonic and fermionic. We show here that Hong-Ou-Mandel (HOM) interferences between excitations created by narrow vo…
View article: An on-demand source of non-local energy-entangled quantum states using Levitons
An on-demand source of non-local energy-entangled quantum states using Levitons Open
We propose a device where Electronic Quantum Optics (EQO) is combined with a BCS superconductor -- a reservoir of Cooper pairs. With spin polarized wave guides, this version of the Cooper pair beam splitter is driven by an AC drive, and ob…
View article: Designer flat bands: Topology and enhancement of superconductivity
Designer flat bands: Topology and enhancement of superconductivity Open
We construct quasi one-dimensional topological and non-topological three-band\nlattices with tunable band gap and winding number of the flat band. Using mean\nfield (MF) and exact density matrix renormalization group (DMRG) calculations,\n…
View article: Anyonic statistics revealed by the Hong-Ou-Mandel dip for fractional excitations
Anyonic statistics revealed by the Hong-Ou-Mandel dip for fractional excitations Open
The fractional quantum Hall effect (FQHE) is known to host anyons, quasiparticles whose statistics is intermediate between bosonic and fermionic. We show here that Hong-Ou-Mandel (HOM) interferences between excitations created by narrow vo…
View article: Momentum signatures of site percolation in disordered two-dimensional ferromagnets
Momentum signatures of site percolation in disordered two-dimensional ferromagnets Open
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View article: Quantum boomerang effect in systems without time-reversal symmetry
Quantum boomerang effect in systems without time-reversal symmetry Open
In an Anderson localized system, a quantum particle with a nonzero initial\nvelocity returns, on average, to its origin. This recently discovered behavior\nis known as the quantum boomerang effect. Time reversal invariance was\ninitially t…
View article: Microscopic theory of photoassisted electronic transport in normal-metal/BCS-superconductor junctions
Microscopic theory of photoassisted electronic transport in normal-metal/BCS-superconductor junctions Open
We investigate photo assisted electronic transport in a\nnormal-metal/BCS-superconductor junction with a microscopic Hamiltonian\napproach, for several types of periodic voltage drives applied on the\nnormal-metal side. The time-dependent …
View article: Momentum Signatures of Site Percolation in Disordered 2D Ferromagnets
Momentum Signatures of Site Percolation in Disordered 2D Ferromagnets Open
In this work, we consider a two-dimensional square lattice of pinned magnetic spins with nearest-neighbour interactions and we randomly replace a fixed proportion of spins with nonmagnetic defects carrying no spin. We focus on the linear s…
View article: Pairing and superconductivity in quasi-one-dimensional flat-band systems: Creutz and sawtooth lattices
Pairing and superconductivity in quasi-one-dimensional flat-band systems: Creutz and sawtooth lattices Open
We study the pairing and superconducting properties of the attractive Hubbard\nmodel in two quasi one-dimensional topological lattices: the Creutz and\nsawtooth lattices. They share two peculiar properties: each of their band\nstructures e…