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could anyone elucidate on how Ashcroft and Mermin get

[tex] \sqrt{\frac{det M}{M_{zz}}} [/tex]

for the cyclotron effective mass (page 571)?

Is this true for all energy contours or only certain ones? And if that's the case which because they don't seem to specify?

thanks.

[tex] \sqrt{\frac{det M}{M_{zz}}} [/tex]

for the cyclotron effective mass (page 571)?

Is this true for all energy contours or only certain ones? And if that's the case which because they don't seem to specify?

thanks.

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