when calculating the frequencies of 1\H's oscillation using De Haas-van Alphen, we need to find the extremal cross-section of the fermi surface perpendicular to the magnetic field direction.(adsbygoogle = window.adsbygoogle || []).push({});

in 3d i can understand this. but when talking about a 2d lattice where the magnetic field is perpendicular to the lattice plane, what do i take as the extremal fermi surface cross section?

and another question, back to 3D - if i have several bands, each of them have different fermi surface, right? so i need to take the extremal cross section at each of them?

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# De Haas-van Alphen effect in a 2d lattice

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