Zero-bias Anomaly of Quantum Point Contacts in the Low-Conductance Limit
arXiv:1005.3764 · doi:10.1103/PhysRevB.82.045313
Abstract
Most quantum point contacts (QPCs) fabricated in high-mobility 2D electron gases show a zero-bias conductance peak near pinchoff, but the origin of this peak remains a mystery. Previous experiments have primarily focused on the zero-bias peak at moderate conductance, in the range (1-2)e^2/h. Here, measurements are presented of zero-bias peaks that persist down to 10^{-4}e^2/h. Magnetic field and temperature dependencies of the zero-bias peak in the low-conductance limit are qualitatively different from the analogous phenomenology at higher conductance, with implications for existing theoretical models of transport in low-density QPCs.
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Cited by in corpus (10)
- Superconductor-Nanowire Devices from Tunneling to the Multichannel Regime: Zero-Bias Oscillations and Magnetoconductance Crossover
- What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
- Observation of the Kondo Effect in a Spin-3/2 Hole Quantum Dot
- Electron phase shift at the zero-bias anomaly of quantum point contacts
- Tuning the Fano Resonance with an Intruder Continuum
- Origins of conductance anomalies in a p-type GaAs quantum point contact
- Thermoelectric Scanning Gate Interferometry on a Quantum Point Contact
- Dynamic nuclear polarization at high Landau levels in a quantum point contact
- Detecting weak coupling in mesoscopic systems with a nonequilibrium Fano resonance
- Quasibound States and Evidence for a Spin 1 Kondo Effect in Asymmetric Quantum Point Contacts