Fig. 2: Exceptional transport anisotropy at millikelvin temperatures.
From: Evidence for two dimensional anisotropic Luttinger liquids at millikelvin temperatures
a A dual-gate map of resistance (Rhard, geometry shown in b) taken in device 1 at 4 K. b Cartoon illustration of measurement geometries for Rhard and Reasy. c Rhard v.s. Vbg taken at various T, ranging from 50 mK (blue) to 2 K (red). See inset in (e–g) for temperature legends. Vtg is kept at 2 V as indicated by the dashed line in (a). d Same measurements as in (c) but for Reasy. e The gate-dependent anisotropy ratio β ≡ Rhard/Reasy under various T. Orange (blue) arrow indicates the gate where the orange (blue) curve in (f) is extracted. f β as a function of T, plotted for two typical ng in electron (hole) side. Data taken in both devices 1 and 2 are shown. g (dV/dI)hard v.s. d.c. bias V at various T at a selected gate parameter indicated by the cross in (a). h The same as (g) but for easy direction. i Bias-dependent anisotropy β at various T.
