Locally induced quantum interference in scanning gate experiments

Abstract

We present conductance measurements of a ballistic circular stadium influenced by a scanning gate. When the tip depletes the electron gas below, we observe very pronounced and regular fringes covering the entire stadium. The fringes correspond to transmitted modes in constrictions formed between the tip-induced potential and the boundaries of the stadium. Moving the tip and counting the fringes gives us exquisite control over the transmission of these constrictions. We use this control to form a quantum ring with a specific number of modes in each arm showing the Aharonov-Bohm effect in low-field magnetoconductance measurements.

10 pages, 4 figures

References in corpus (3)

• Imaging and controlling electron transport inside a quantum ring
• Imaging Coulomb Islands in a Quantum Hall Interferometer
• Selective control of edge-channel trajectories by scanning gate microscopy

Cited by in corpus (8)

• Scanning gate experiments: from strongly to weakly invasive probes
• Scanning gate imaging in confined geometries
• Scanning-gate-induced effects and spatial mapping of a cavity
• Classical origin of conductance oscillations in an integrable cavity
• Mode specific backscattering in a quantum point contact
• Electron backscattering in a cavity: ballistic and coherent effects
• Electron paths and double-slit interference in the scanning gate microscopy
• Multitip scanning gate microscopy for ballistic transport studies in systems with two-dimensional electron gas