Hi, a question please: Do all metallic substances have an equal Fermi energy level (at a constant T) ? If not, what will happen (before equilibrium) if one "fuses" together two bulks of metal with different Fermi levels (as in a PN junction) ? Since there's an abundance of energy states available around the Fermi level in metals, I would consequently expect electrons to flow between the bulks until an equilibrium is reached. On the other hand, I sense a hole in my little theory here. Many thanks. A.