Coherent tunnelling across a quantum point contact in the quantum Hall regime
(2013) Scientific Reports — Vol. 3, n° 1416, p. 1416 (2013)
Files
BH_Coherenttunnelling_mars2013.pdf
Restricted Access - Adobe PDF
- 518.31 KB
Details
- Authors
- 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.
- Affiliations
Citations
Rodrigues Martins, F., Faniel, S., Rosenow, B., Sellier, H., Huant, S., Pala, M. G., Desplanque, L., Wallart, X., Bayot, V., & Hackens, B. (2013). Coherent tunnelling across a quantum point contact in the quantum Hall regime. Scientific Reports, 3(1416), 1416. https://doi.org/10.1038/srep01416 (Original work published 2013)