Coherent tunnelling across a quantum point contact in the quantum Hall regime
arXiv:1305.1589 · doi:10.1038/srep01416
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.
19 pages, 8 figures
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- Direct Imaging of Coherent Quantum Transport in Graphene Heterojunctions
- Electron phase shift at the zero-bias anomaly of quantum point contacts
- Interplay of fractional quantum Hall states and localization in quantum point contacts
- Signatures of spin-orbit coupling in scanning gate conductance images of electron flow from quantum point contacts
- Resonant electron tunneling in a tip-controlled potential landscape
- Tunneling Spectroscopy of Quantum Hall States in Bilayer Graphene PN Networks
- Interaction-induced supercurrent in quantum Hall setups
- Imaging of double slit interference by scanning gate microscopy
- Chiral Quasiparticle Tunneling Between Quantum Hall Edges in Proximity with a Superconductor
- Wave function description of conductance mapping for quantum Hall electron interferometer
- Mode specific backscattering in a quantum point contact
- Contacts and upstream modes explain the electron-hole asymmetry in the graphene quantum Hall regime
- Nontrivial transition of transmission in a highly open quantum point contact in the quantum Hall regime
- Accurate characterization of tip-induced potential using electron interferometry
- Revisiting Coulomb diamond signatures in quantum Hall interferometers