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0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires

R. Danneau·O. Klochan·W. R. Clarke·L. H. Ho·A. P. Micolich·M. Y. Simmons·A. R. Hamilton·M. Pepper·D. A. Ritchie
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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 $g^{*}$ 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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R. Danneau, O. Klochan, W. R. Clarke, L. H. Ho, A. P. Micolich, M. Y. Simmons, A. R. Hamilton, M. Pepper, D. A. Ritchie. 2008-07-01. 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires. https://doi.org/10.1103/physrevlett.100.016403

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