Revaz Ramazashvili (LPT) – HdR defense
This work is devoted to unusual spin-orbit couplings in antiferromagnets: those that fall outside the textbook classification by order of the expansion in the inverse speed of light 1/c. Contrary to the textbook Pauli spin-orbit coupling that arises only at second order in 1/c, the unusual couplings of this work appear already at first and zeroth order in 1/c:
– The Zeeman spin-orbit coupling, arising from a substantial momentum dependence of the g-tensor, is first-order in 1/c.
– A smooth texture (non-uniform configuration) of the Néel order parameter generates a spin-orbit coupling that is of order zero in 1/c.
Both the Zeeman and the texture-induced spin-orbit coupling produce anomalous effects that are also a subject of this work.
contact : R. Ramazashvili