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Supplemental Information

Characteristic conduction curves measuring the conductance as a function of break junction evolution (time) resemble the figure below.

An oscillating piezoelectric actuator will create many break junctions. Conduction measurement data are compiled into histograms to provide statistical evidence for preferential values of conduction at multiples of G = 2e2/h or e2/h -1.

Figure 1: Entire Experiment

1. Break Junction and piezoelectric actuator (see Figure 4)
2. Amplifier Circuit
3. Oscilloscope
4. Labview Program - creates histograms (see Figure 2)
5. Magnetic Coils (see Figure 3)
6. Electrical Shielding
7. Piezoelectric actuator controller
8. Vibration Isolation

Figure 2: Coils and Break Junction

There are two wires in contact at point A. The wires are not visible because they are submerged in oil (notice the square plastic oil container) to eliminate oxidation.

The piezoelectric actuator is the metallic device at B. The sample wires are attached to the black shielded cables. One is rigidly held in place by the structure labeled C. The other wire is attached to the piezoelectric actuator.

For additional information email Zach Lingley at zrl@u.washington.edu.

2003 Undergraduate Research Symposium Presentation