Scanning tunneling thermometer
View Patent ↗Various examples are provided related to scanning tunneling thermometers and scanning tunneling microscopy (STM) techniques. In one example, a method includes simultaneously measuring conductance and thermopower of a nanostructure by toggling between: applying a time modulated voltage to a nanostructure disposed on an interconnect structure, the time modulated voltage applied at a probe tip positioned over the nanostructure, while measuring a resulting current at a contact of the interconnect structure; and applying a time modulated temperature signal to the nanostructure at the probe tip, while measuring current through a calibrated thermoresistor in series with the probe tip. In another example, a device includes an interconnect structure with connections to a first reservoir and a second reservoir; and a scanning tunneling probe in contact with a probe reservoir. Electrical measurements are simultaneously obtained for temperature and voltage applied to a nanostructure between the reservoirs.
1. A scanning tunneling probe comprising:
a probe tip in series with a calibrated thermoresistor, the scanning tunneling probe in contact with a probe reservoir, where electrical measurements are simultaneously obtained for temperature and voltage applied to a nanostructure.
2. The scanning tunneling probe of claim 1 , wherein the scanning tunneling probe scans a surface of the nanostructure at a constant height and is not in contact with the nanostructure surface.
3. The scanning tunneling probe of claim 1 , wherein the nanostructure is connected between a first reservoir and a second reservoir.
4. The scanning tunneling probe of claim 3 , wherein the first reservoir or the second reservoir is biased to place the nanostructure out of equilibrium.
5. The scanning tunneling probe of claim 3 , wherein a switch is connected to each of the first and second reservoirs, the switch configured to connect or disconnect the first reservoir or the second reservoir to a time-modulated voltage.
6. The scanning tunneling probe of claim 1 , wherein the nanostructure is connected to more than two reservoirs through corresponding switches.
7. The device of claim 6 , wherein a single one of the more than two reservoirs is connected by the corresponding switch while all other reservoirs of the more than two reservoirs remain disconnected.
8. The scanning tunneling probe of claim 1 , wherein the nanostructure is a nanoscale conductor.
9. The scanning tunneling probe of claim 1 , wherein the nanostructure is supported between a first reservoir and a second reservoir.