0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires

Abstract

We study the anomalous conductance plateau around $G=0.7(2e^2/h)$ and the zero-bias anomaly in ballistic hole quantum wires with respect to in-plane magnetic fields applied parallel $B_{\parallel }$ and perpendicular $B_{\perp }$ to the quantum wire. As seen in electron quantum wires, the magnetic fields shift the 0.7 structure down to $G=0.5(2e^2/h)$ and simultaneously quench the zero bias anomaly. However, these effects are strongly dependent on the orientation of the magnetic field, owing to the highly anisotropic effective Landé \emph{g}-factor $g^{\ast }$ in hole quantum wires. Our results highlight the fundamental role that spin plays in both the 0.7 structure and zero bias anomaly.

Phys. Rev. Lett. 100, 016403 (2008)

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Cited by in corpus (15)

• Wigner crystal physics in quantum wires
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Ballistic one-dimensional holes with strong g-factor anisotropy in germanium
• Observation of orientation- and $k$-dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures
• Evidence for localization and 0.7 anomaly in hole quantum point contacts
• Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure
• A minimal model of quantized conductance in interacting ballistic quantum wires
• Origins of conductance anomalies in a p-type GaAs quantum point contact
• Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts
• The origin of gate hysteresis in p-type Si-doped AlGaAs/GaAs heterostructures
• Nanostructures in p-GaAs with improved tunability
• Scanning Gate Imaging of quantum point contacts and the origin of the 0.7 Anomaly
• Quantised conductance of one-dimensional strongly-correlated electrons in an oxide heterostructure
• High-quality quantum point contact in two-dimensional GaAs (311)A hole system
• Non-linear spin filter for non-magnetic materials at zero magnetic field