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_‖ and perpendicular B_⊥ 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 Lande 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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