Title :

Revisiting Coulomb diamond signatures in quantum Hall interferometers

Author(s) :

Moreau, N. [Auteur]
Faniel, S. [Auteur]
Institut de la matière condensée et des nanosciences / Institute of Condensed Matter and Nanosciences [IMCN]
Martins, Fabrice [Auteur]
Desplanque, Ludovic [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
EPItaxie et PHYsique des hétérostructures - IEMN [EPIPHY - IEMN]
Wallart, Xavier [Auteur]
EPItaxie et PHYsique des hétérostructures - IEMN [EPIPHY - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Melinte, S. [Auteur]
Institute of Information and Communication Technologies, Electronics and Applied Mathematics [ICTEAM]
Bayot, V. [Auteur]
Institut de la matière condensée et des nanosciences / Institute of Condensed Matter and Nanosciences [IMCN]
Hackens, B. [Auteur]
Institut de la matière condensée et des nanosciences / Institute of Condensed Matter and Nanosciences [IMCN]

Journal title :

Physical Review B

Pages :

115144

Publisher :

American Physical Society

Publication date :

2022-03

ISSN :

2469-9950

English keyword(s) :

Aharonov-Bohm effect
Coulomb blockade
Integer quantum Hall effect
Quantum Hall effect
Quantum interference effects
Quantum transport

HAL domain(s) :

Sciences de l'ingénieur [physics]

English abstract : [en]

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 ...
Show more >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 proposed interpretation of diamond phenomenology will likely lead to revisiting previous data, and opens the way toward engineering more complex interferometric devices with nanoscale dimensions.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

MICroscopie Avancée du Transport Electronique Cohérent

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL