490 citations · 1.5k across the 30 of their papers we have counts for
24 papers · 1 filter
Revisiting Coulomb diamond signatures in quantum Hall interferometers
N. Moreau, S. Faniel, F. Martins +5
Coulomb diamonds are the archetypal signatures of Coulomb blockade, a well-known charging effect mainly observed in nanometer-sized "electronic islands" tunnel-coupled with charge…
2D Rutherford-Like Scattering in Ballistic Nanodevices
S. Toussaint, B. Brun-Barrière, S. Faniel +4
Ballistic injection in a nanodevice is a complex process where electrons can either be transmitted or reflected, thereby introducing deviations from the otherwise quantized conduct…
Thermoelectric Scanning Gate Interferometry on a Quantum Point Contact
B. Brun, F. Martins, S. Faniel +11
We introduce a new scanning probe technique derived from scanning gate microscopy (SGM) in order to investigate thermoelectric transport in two-dimensional semiconductor devices. T…
Electron phase shift at the zero-bias anomaly of quantum point contacts
B. Brun, F. Martins, S. Faniel +11
The Kondo effect is the many-body screening of a local spin by a cloud of electrons at very low temperature. It has been proposed as an explanation of the zero-bias anomaly in quan…
Formation of quantum dots in the potential fluctuations of InGaAs heterostructures probed by scanning gate microscopy
P. Liu, F. Martins, B. Hackens +6
The disordered potential landscape in an InGaAs/InAlAs two-dimensional electron gas patterned into narrow wires is investigated by means of scanning gate microscopy. It is found th…
Planning the electron traffic in semiconductor networks: A mesoscopic analog of the Braess paradox encountered in road networks
S. Huant, S. Baltazar, P. Liu +7
By combining quantum simulations of electron transport and scanning-gate microscopy, we have shown that the current transmitted through a semiconductor two-path rectangular network…
Wigner and Kondo physics in quantum point contacts revealed by scanning gate microscopy
B. Brun, F. Martins, S. Faniel +11
Quantum point contacts exhibit mysterious conductance anomalies in addition to well known conductance plateaus at multiples of 2e^2/h. These 0.7 and zero-bias anomalies have been i…
Coherent tunnelling across a quantum point contact in the quantum Hall regime
F. Martins, S. Faniel, B. Rosenow +7
The unique properties of quantum Hall devices arise from the ideal one-dimensional edge states that form in a two-dimensional electron system at high magnetic field. Tunnelling bet…
Scanning Gate Spectroscopy of transport across a Quantum Hall Nano-Island
F. Martins, S. Faniel, B. Rosenow +7
We explore transport across an ultra-small Quantum Hall Island (QHI) formed by closed quan- tum Hall edge states and connected to propagating edge channels through tunnel barriers.…
A new transport phenomenon in nanostructures: A mesoscopic analog of the Braess paradox encountered in road networks
Marco Pala, Hermann Sellier, Benoit Hackens +3
The Braess paradox, known for traffic and other classical networks, lies in the fact that adding a new route to a congested network in an attempt to relieve congestion can counter-…
Transport inefficiency in branched-out mesoscopic networks: An analog of the Braess paradox
M. G. Pala, S. Baltazar, P. Liu +7
We present evidence for a counter-intuitive behavior of semiconductor mesoscopic networks that is the analog of the Braess paradox encountered in classical networks. A numerical si…
Structural and electrical characterization of hybrid metal-polypyrrole nanowires
L. Gence, S. Faniel, C. Gustin +5
We present here the synthesis and structural characterization of hybrid Au-polypyrrole-Au and Pt- polypyrrole-Au nanowires together with a study of their electrical properties from…
On the imaging of electron transport in semiconductor quantum structures by scanning-gate microscopy: successes and limitations
Hermann Sellier, Benoit Hackens, Marco Pala +6
This paper presents a brief review of scanning-gate microscopy applied to the imaging of electron transport in buried semiconductor quantum structures. After an introduction to the…
Imaging Coulomb Islands in a Quantum Hall Interferometer
B. Hackens, F. Martins, S. Faniel +7
In the Quantum Hall regime, near integer filling factors, electrons should only be transmitted through spatially-separated edge states. However, in mesoscopic systems, electronic t…
Scanning-gate microscopy of semiconductor nanostructures: an overview
F. Martins, B. Hackens, H. Sellier +7
This paper presents an overview of scanning-gate microscopy applied to the imaging of electron transport through buried semiconductor nanostructures. After a brief description of t…
Local Density of States in Mesoscopic Samples from Scanning Gate Microscopy
M. G. Pala, B. Hackens, F. Martins +4
We study the relationship between the local density of states (LDOS) and the conductance variation in scanning-gate-microscopy experiments on mesoscopic structures as a charge…
Imaging Electron Wave Functions Inside Open Quantum Rings
F. Martins, B. Hackens, M. G. Pala +8
Combining Scanning Gate Microscopy (SGM) experiments and simulations, we demonstrate low temperature imaging of electron probability density in embedded mesoscopic q…
Imaging and controlling electron transport inside a quantum ring
B. Hackens, F. Martins, T. Ouisse +7
Traditionally, the understanding of quantum transport, coherent and ballistic1, relies on the measurement of macroscopic properties such as the conductance. While powerful when cou…
Dephasing Time of Two-Dimensional Holes in GaAs Open Quantum Dots
S. Faniel, B. Hackens, A. Vlad +6
We report magnetotransport measurements of two-dimensional holes in open quantum dots, patterned either as a single-dot or an array of dots, on a GaAs quantum well. For temperature…
Thermopower of Interacting GaAs Bilayer Hole Systems in the Reentrant Insulating Phase near
S. Faniel, E. Tutuc, E. P. De Poortere +5
We report thermopower measurements of interacting GaAs bilayer hole systems. When the carrier densities in the two layers are equal, these systems exhibit a reentrant insulating ph…
Long dephasing time and high temperature ballistic transport in an InGaAs open quantum dot
B. Hackens, S. Faniel, F. Delfosse +7
We report on measurements of the magnetoconductance of an open circular InGaAs quantum dot between 1.3K and 204K. We observe two types of magnetoconductance fluctuations: universal…
NMR Determination of 2D Electron Spin Polarization at
S. Melinte, N. Freytag, M. Horvatic +4
Using a `standard' NMR spin-echo technique we determined the spin polarization of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei i…
Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy
S. Melinte, E. Grivei, V. Bayot +1
Measurements on a multilayer two-dimensional electron system (2DES) near Landau level filling =1 reveal the disappearance of the nuclear spin contribution to the heat capacity a…
Critical Behavior of Nuclear-Spin Diffusion in GaAs/AlGaAs Heterostructures near Landau Level Filling ν=1
V. Bayot, E. Grivei, J. -M. Beuken +2
Thermal measurements on a GaAs/AlGaAs heterostructure reveal that the state of the confined two-dimensional electrons dramatically affects the nuclear-spin diffusion near Landau le…