Figure 1. Structure and operational principle of a micro-thermometer-embedded mechanically-controllable break junction (MCBJ).

(a,b) A scanning electron microscopy image (a) and a schematic layout of a thermometer-integrated MCBJ (b). The device consists of a free-standing Au nano-junction and two adjacent Pt coils that function as a heater and a resistance thermometer. The alumina layers thermally connect the junction and the Pt coils. Regions marked by green rectangles possess free-standing structure. Scale bar is 10 μm. (c) A three-point bending configuration used for break junction experiments. Scale bar in the magnified view of a Au nanobridge is 1 μm. (d) The Au contact can be broken and re-formed by manipulating the beam bending.