We have developed a controlled and highly reproducible method of making nanometer-spaced electrodes using electromigration in ambient lab conditions. This advance will make feasible single molecule measurements of macromolecules with tertiary and quaternary structures that do not survive the liquid-helium temperatures at which electromigration is typically performed. A second advance is that it yields gaps of desired tunneling resistance, as opposed to the random formation at liquid-helium temperatures. Nanogap formation occurs through three regimes: First it evolves through a bulk-neck regime where electromigration is triggered at constant temperature, then to a few-atom regime characterized by conductance quantum plateaus and jumps, and finally to a tunneling regime across the nanogap once the conductance falls below the conductance quantum.
|Applied Physics Letters
|Published - 2005
Bibliographical noteFunding Information:
This work was supported through NSF-NIRT Grant No. 0304531 and MRSEC-NSF Grant No. DMR-00-79909. D.J. acknowledges financial support from NSF IGERT program (Grant No. DGE-0221664) and SENS.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)