Superconductors exhibit some properties that are analogous to those of quantum dots, quantum wires, and quantum wells. This is the case, in part, because their characteristic length scales X and £ are in the nanorange, as the representative data in Table 9.6 indicate. The table also gives the transition temperature Tc below which each material superconducts, that is, has zero electrical resistance. The majority of the values of A and £ listed in the table are 200 nm or less, and several are below 6nm. The penetration depth A is a measure of the distance that an externally applied

QD Edge Emitter, HR / HR 9|vnx 1020 um - T = 295 K, CW

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