Fig. 3
From: Giant thermoelectric power factor in ultrathin FeSe superconductor
Giant thermoelectric response in ultrathin FeSe. a Mapping of Seebeck coefficient α of FeSe (Sample B) against temperature T and thickness d. Here, the absolute value of α (i.g., |α|) for VG = 3.95 V was plotted. The white circles correspond to the onset temperature Tc of the superconducting transition. b Evolution of thermoelectric power factor α2/ρ of FeSe (Sample B) above Tc. The value of α2/ρ increased with decreasing d, mainly owing to the large enhancement of α shown in a. c Comparison of temperature dependence of α2/ρ among representative thermoelectric materials. The values of α2/ρ in the FeSe ultrathin film were larger than any existing bulk materials reported so far in a wide temperature range (see Supplementary Table 1 for the reference of the experimental values). The data point for Sample A at 200 K (open circle) shows fair reproducibility
