Saturday, March 14, 2015

solid state physics - Do we say that phonon has effective mass through its dispersion relation?



The effective mass is proportional to the second derivative of the dispersion relation $d^2k/dE^2$. Do we say that phonon have effective mass through it? Spin wave have.




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...