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
2008 Physical Review Letters  
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
more » ... effective Landég-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.
doi:10.1103/physrevlett.100.016403 pmid:18232794 fatcat:w5464m3lozh7bixcupgcqr5vvu