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Abstract: In this work we study the Zeeman splitting in induced ballistic 1D wires fabricated along two orthogonal crystallographic directions and . Our data shows that the g-factor anisotropy for the high symmetry direction can be explained by the 1D confinement only, whereas in the case of direction, the interaction between the 1D confinement and crystal anisotropy effects is evident. [Copyright &y& Elsevier]

Abstract: We have fabricated and studied ballistic one-dimensional hole quantum wires using a high mobility undoped (100)-oriented AlGaAs/GaAs heterostructure. The devices exhibit clear quantized conductance plateaus with highly stable gate characteristics. These devices provide a platform for studying one-dimensional phenomena in hole systems with minimal crystallographic effects. [Copyright &y& Elsevier]

Abstract: We report a study of the anomalous conductance plateau around and the zero-bias anomaly in ballistic one-dimensional (1D) hole systems. In-plane magnetic field B applied to the 1D system shows a clear anisotropic behavior of the 0.7 structure and the zero-bias anomaly for parallel and perpendicular to the quantum wire. These measurements confirm that these features are closely linked and related to spin. Moreover, we demonstrate that the behavior of the 0.7 structure could be influenced by band mixing at low conductance in this spin- 1D systems. [Copyright &y& Elsevier]

Abstract: We have studied the ballistic transport properties of a one-dimensional (1D) channel created in a high mobility bilayer 2D hole system formed in a back-gated GaAs-AlGaAs heterostructure. We observe clean and robust conductance quantization in units of at dilution refrigerator base temperatures without the hysteresis and irregular oscillations that have hampered previous studies of 1D hole systems. In addition to the expected plateaus at multiples of , we also report the first observation of a clear step at for a 1D hole system. We observed ballistic transport in both the upper and lower quantum wires, with the strongest quantization obtained in the upper wire. The high stability of these devices and the clear conductance quantization has allowed us to measure the energy spacing of the 1D subbands, which is significantly smaller than for comparable electron systems, due to the large effective hole mass. [Copyright &y& Elsevier]