2 papers
cond-mat.mtrl-sci2025
Nonlinear optical quantum theory of demagnetization in L1 FePt and FePd
G. P. Zhang, Y. H. Bai, Thomas F. George
It is now well established that a laser pulse can demagnetize a ferromagnet. However, for a long time, it has not had an analytic theory because it falls into neither nonlinear opt…
cond-mat.mtrl-sci2025
Revisiting the matrix elements of the position operator in the crystal momentum representation
M. S. Si, G. P. Zhang
Fewer operators are more fundamental than the position operator in a crystal. But since it is not translationally invariant in crystal momentum representation (CMR), how to properl…