0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires

Details 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires

2007-02-08

arxiv.org/abs/cond-mat/0702210v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevLett.100.016403

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 Land\'{e} \emph{g}-factor $g^{*}$ in hole quantum wires. Our results highlight the fundamental role that spin plays in both the 0.7 structure and zero bias anomaly.

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