Year: 2013
Type: conference-paper
Abstract: 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 between edge states across a quantum point contact (QPC) has already revealed rich physics, like fractionally charged excitations, or chiral Luttinger liquid.Thanks to scanning gate microscopy, we show that a single QPC can turn into an interferometer for specific potential landscapes.Spectroscopy, magnetic field and temperature dependences of electron transport reveal a quantitatively consistent interferometric behavior of the studied QPC.To explain this unexpected behavior, we put forward a new model which relies on the presence of a quantum Hall island at the centre of the constriction as well as on different tunnelling paths surrounding the island, thereby creating a new type of interferometer.This work sets the ground for new device concepts based on coherent tunnelling.
Institutions: UCLouvain, Leipzig University, Centre National de la Recherche Scientifique, Université Joseph Fourier, Institut Néel, Institut polytechnique de Grenoble, Institut de Microélectronique, Electromagnétisme et Photonique, Centre de Radiofréquences, Optique et Micro-nanoélectronique des Alpes, Institut d'Electronique, de Microélectronique et de Nanotechnologie
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3104015109