Fig. 3 | Nature Communications

Fig. 3

From: Momentum-dependent power law measured in an interacting quantum wire beyond the Luttinger limit

Fig. 3

The 1D–2D spectrometer device. a Illustration of the 1D–2D spectrometer device. The control gates are split gate (SG) and mid-gate (MG) (depleting the lower layer but not the top, to inject current into the upper layer), gates defining 1D wires (WG), gate over the parasitic region (PG), and barrier gate (BG) confining the upper layer. Gates are not drawn to scale. In reality, they consist of a three-column array of over 500 wires, each of length 18 µm and gate width 0.1 µm, with 0.18-µm separation (device A) and 10 µm and gate width 0.3 µm, with 0.2-µm separation (device B). b Schematic of current flow: current enters the top layer under mid-gate MG at the left, flows into 1D wires (blue) via parasitic regions (magenta, labelled P) and tunnels to a lower, 2D, layer and out to a contact at the right. c Scanning electron micrograph of a device, showing the air bridges. The scale bar is 5-μm long

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