Multitip scanning gate microscopy for ballistic transport studies in systems with two-dimensional electron gas

Abstract

We consider conductance mapping of systems based on the two-dimensional electron gas with scanning gate microscopy using two and more tips of the atomic force microscope. The paper contains results of numerical simulations for a model tip potential with a proposal of a few procedures for extraction and manipulation the ballistic transport properties. In particular, we demonstrate that the multi-tip techniques can be used for readout of the Fermi wavelength, detection of potential defects, filtering specific transverse modes, tuning the system into resonant conditions under which a stable map of a local density of states can be extracted from conductance maps using a third tip.

9 pages, 12 figures

References in corpus (12)

• Imaging Magnetic Focusing of Coherent Electron Waves
• On the imaging of electron transport in semiconductor quantum structures by scanning-gate microscopy: successes and limitations
• Imaging Electron Wave Functions Inside Open Quantum Rings
• Imaging Coulomb Islands in a Quantum Hall Interferometer
• Electron interferometer formed with a scanning probe tip and quantum point contact
• Local Density of States in Mesoscopic Samples from Scanning Gate Microscopy
• What is measured in the scanning gate microscopy of a quantum point contact?
• Measurement of the Tip-Induced Potential in Scanning Gate Experiments
• Imaging a 1-electron InAs quantum dot in an InAs/InP nanowire
• Imaging of double slit interference by scanning gate microscopy
• Wave function description of conductance mapping for quantum Hall electron interferometer
• Conductance microscopy of quantum dots weakly or strongly coupled to the conducting channel