Revisiting Coulomb diamond signatures in quantum Hall interferometers
arXiv:2110.07978 · doi:10.1103/PhysRevB.105.115144
Abstract
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 reservoirs. Here, we identify apparent Coulomb diamond features in the scanning gate spectroscopy of a quantum point contact carved out of a semiconductor heterostructure, in the quantum Hall regime. Varying the scanning gate parameters and the magnetic field, the diamonds are found to smoothly evolve to checkerboard patterns. To explain this surprising behavior, we put forward a model which relies on the presence of a nanometer-sized Fabry-Pérot quantum Hall interferometer at the center of the constriction with tunable tunneling paths coupling the central part of the interferometer to the quantum Hall channels running along the device edges. Both types of signatures, diamonds and checkerboards, and the observed transition, are reproduced by simply varying the interferometer size and the transmission probabilities at the tunneling paths. The new proposed interpretation of diamond phenomenology will likely lead to revisit previous data, and opens the way towards engineering more complex interferometric devices with nanoscale dimensions.
arXiv comment8 pages, 4 figures
References in corpus (27)
- An Electronic Mach-Zehnder Interferometer
- Direct observation of anyonic braiding statistics at the =1/3 fractional quantum Hall state
- Fractional statistics in anyon collisions
- Two-particle Aharonov-Bohm effect and Entanglement in the electronic Hanbury Brown Twiss setup
- Coherent control of single electrons: a review of current progress
- Distinct Signatures For Coulomb Blockade and Aharonov-Bohm Interference in Electronic Fabry-Perot Interferometers
- Theory of the Fabry-Perot Quantum Hall Interferometer
- Dephasing in the electronic Mach-Zehnder interferometer at filling factor 2
- Finite bias visibility of the electronic Mach-Zehnder interferometer
- Aharonov-Bohm interference of fractional quantum Hall edge modes
- Edge-State Velocity and Coherence in a Quantum Hall Fabry-Perot Interferometer
- Aharonov Bohm Effect in Graphene Fabry Pérot Quantum Hall Interferometers
- Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene
- A tunable Fabry-Pérot quantum Hall interferometer in graphene
- Detection of Coulomb Charging around an Antidot in the Quantum Hall Regime
- Imaging Coulomb Islands in a Quantum Hall Interferometer
- Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer
- Quantum Hall valley splitters and tunable Mach-Zehnder interferometer in graphene
- Exactly Solved Model for an Electronic Mach-Zehnder Interferometer
- Magneto-transport in high g-factor, low-density two-dimensional electron systems confined in In_0.75Ga_0.25As/In_0.75Al_0.25As quantum wells
- Coulomb Oscillations in Antidots in the Integer and Fractional Quantum Hall Regimes
- Electron tunneling spectroscopy of a quantum antidot in the quantum Hall regime
- Coherent tunnelling across a quantum point contact in the quantum Hall regime
- Upstream modes and antidots poison graphene quantum Hall effect
- Scanning Gate Spectroscopy of transport across a Quantum Hall Nano-Island
- Theory of non-equilibrium electronic Mach-Zehnder interferometer
- 2D Rutherford-Like Scattering in Ballistic Nanodevices