Question: A certain two-dimensional solid crystallizes to a square monoatomic lattice with lattice constant a. Each atom can contribute an integer number of free conduction

A certain two-dimensional solid crystallizes to a square monoatomic lattice with lattice

A certain two-dimensional solid crystallizes to a square monoatomic lattice with lattice constant a. Each atom can contribute an integer number of free conduction electrons. The minimum number of electrons each atom must contribute such that the free electron Fermi circle at zero temperature encloses the first Brillouin zone completely, is

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