Figure 1

Gray scale of the derivative of the differential conductance, as a function of gate voltage, for $B_{\parallel }=0–16\mathrm{T}$. Dark lines correspond to populating a spin-split 1D subband. White regions correspond to conductance plateaux—features are labeled accordingly.Reuse & Permissions

Figure 2

dc bias spectroscopy in the crossing region of $1\uparrow$ and $2\downarrow$. Lower-energy spin-down features are marked blue or dark gray, and higher-energy spin-up features are marked red or gray. (a) Gray-scale plot, as in Fig. 1, showing the evolution of quantum wire conductance characteristics in an in-plane $B$ field. Green or light gray lines indicate the fields at which dc bias data in (c) were taken. (b) Schematic illustrating how we have assigned spin types to features in the dc bias data—at a fixed $B_{\parallel }$, we assume that a spin-up (spin-down) feature at zero dc bias splits into two spin-up (spin-down) features in finite-bias. (c) Gray scale of the derivative of the differential conductance, as a function of gate voltage, for dc biases from $-0.5$ to 1.4 mV, at $B_{\parallel }$ marked with green or light gray lines in (a)—the spin types of the features along a green or light gray line in (a) enable us to identify the spin types of the finite-bias features. Data on the left are reproduced without the annotation on the right for clarity. The spin types at $B=7.8\mathrm{T}$ are ambiguous, however, and imply that an anticrossing is occurring.Reuse & Permissions