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Small Fermi energy, zero-point fluctuations, and nonadiabaticity inMgB2
Physical Review B
Small Fermi energy effects are induced in MgB_2 by the low hole doping in the σ bands which are characterized by a Fermi energy E_ F^σ∼ 0.5 eV. We show that, due to the particularly strong deformation potential relative to the E_2g phonon mode, lattice fluctuations are reflected in strong fluctuations in the electronic band structure. Quantum fluctuations associated to the zero-point lattice motion are responsible for an uncertainty of the Fermi energy of the order of the Fermi energy itself,doi:10.1103/physrevb.71.012501 fatcat:tf5bpek2gncbfni6z6dvq6u7ny