Scanning Gate Spectroscopy of transport across a Quantum Hall Nano-Island
arXiv:1305.1661 · doi:10.1088/1367-2630/15/1/013049
Abstract
We explore transport across an ultra-small Quantum Hall Island (QHI) formed by closed quan- tum Hall edge states and connected to propagating edge channels through tunnel barriers. Scanning gate microscopy and scanning gate spectroscopy are used to first localize and then study a single QHI near a quantum point contact. The presence of Coulomb diamonds in the spectroscopy con- firms that Coulomb blockade governs transport across the QHI. Varying the microscope tip bias as well as current bias across the device, we uncover the QHI discrete energy spectrum arising from electronic confinement and we extract estimates of the gradient of the confining potential and of the edge state velocity.
13 pages, 3 figures
References in corpus (14)
- Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
- Edge-State Velocity and Coherence in a Quantum Hall Fabry-Perot Interferometer
- Imaging and controlling electron transport inside a quantum ring
- Imaging Electron Wave Functions Inside Open Quantum Rings
- Imaging Coulomb Islands in a Quantum Hall Interferometer
- Quantum coherence engineering in the integer quantum Hall regime
- Imaging Transport Resonances in the Quantum Hall Effect
- Local Density of States in Mesoscopic Samples from Scanning Gate Microscopy
- Measurement of the Tip-Induced Potential in Scanning Gate Experiments
- Imaging a 1-electron InAs quantum dot in an InAs/InP nanowire
- Electron interactions in an antidot in the integer quantum Hall regime
- Universality of Bias- and Temperature-induced Dephasing in Ballistic Electronic Interferometers
- Imaging backscattering through impurity-induced antidots in quantum Hall constrictions
- The effect of sample properties on the electron velocity in quantum Hall bars
Cited by in corpus (12)
- Time-of-Flight Measurements of Single-Electron Wave Packets in Quantum-Hall Edge States
- Wigner and Kondo physics in quantum point contacts revealed by scanning gate microscopy
- Coherent tunnelling across a quantum point contact in the quantum Hall regime
- Upstream modes and antidots poison graphene quantum Hall effect
- Interplay of fractional quantum Hall states and localization in quantum point contacts
- Formation of quantum dots in the potential fluctuations of InGaAs heterostructures probed by scanning gate microscopy
- Imaging of double slit interference by scanning gate microscopy
- Wave function description of conductance mapping for quantum Hall electron interferometer
- Accurate characterization of tip-induced potential using electron interferometry
- Revisiting Coulomb diamond signatures in quantum Hall interferometers
- Imaging signatures of the local density of states in an electronic cavity
- Multitip scanning gate microscopy for ballistic transport studies in systems with two-dimensional electron gas