On the Zero-Bias Anomaly in Quantum Wires

Abstract

Undoped GaAs/AlGaAs heterostructures have been used to fabricate quantum wires in which the average impurity separation is greater than the device size. We compare the behavior of the Zero-Bias Anomaly against predictions from Kondo and spin polarization models. Both theories display shortcomings, the most dramatic of which are the linear electron-density dependence of the Zero-Bias Anomaly spin-splitting at fixed magnetic field B and the suppression of the Zeeman effect at pinch-off.

References in corpus (12)

• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Observation of the two-channel Kondo effect
• Kondo effect in quantum dots
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Transition between Quantum States in a Parallel-Coupled Double-Quantum-Dot
• Density dependent spin polarisation in ultra low-disorder quantum wires
• Magnetic impurity formation in quantum point contacts
• Measurements of Kondo and spin splitting in single-electron transistors
• Zero-field Kondo splitting and quantum-critical transition in double quantum dots
• Probing the microscopic structure of bound states in quantum point contacts
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• Non-Kondo zero-bias anomaly in quantum wires

Cited by in corpus (24)

• 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
• Distinguishing impurity concentrations in GaAs and AlGaAs, using very shallow undoped heterostructures
• Statistical study of conductance properties in one-dimensional quantum wires focussing on the 0.7 anomaly
• Zero-bias Anomaly of Quantum Point Contacts in the Low-Conductance Limit
• Electron phase shift at the zero-bias anomaly of quantum point contacts
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Interplay of fractional quantum Hall states and localization in quantum point contacts
• A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces
• Origins of conductance anomalies in a p-type GaAs quantum point contact
• Scaling of the Kondo zero bias peak in a hole quantum dot at finite temperatures
• The effect of split gate size on the electrostatic potential and 0.7 anomaly within one-dimensional quantum wires on a modulation doped GaAs/AlGaAs heterostructure
• Anomalous excitations of atomically crafted quantum magnets
• Signature of spin-resolved quantum point contact in p-type trilayer WSe${}_2$ van der Waals heterostructure
• Nuclear Polarization in Quantum Point Contacts in an In-Plane Magnetic Field
• Scanning Gate Imaging of quantum point contacts and the origin of the 0.7 Anomaly
• Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
• Dynamic nuclear polarization at high Landau levels in a quantum point contact
• Majorana transport in superconducting nanowire with Rashba and Dresselhaus spin-orbit couplings
• A universal explanation of tunneling conductance in exotic superconductors
• Incipient singlet-triplet states in a hybrid mesoscopic system
• Stable electroluminescence in ambipolar dopant-free lateral p-n junctions
• Magnetic Splitting of the Zero Bias Peak in a Quantum Point Contact with a Variable Aspect Ratio
• Analyzing scanning tunneling spectroscopy for Fe-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and extracting $s$-wave density of states