A Fermi liquid with spin-orbit coupling*

In a series of papers [1-4], we have constructed a theory of a Fermi liquid (FL) with spin-orbit coupling. The main prediction of this theory is a new type of collective modes: chiral spin waves, which are oscillations of magnetization in a time-reversal--invariant system. The focus of this talk will be on the interpretation of recent Raman experiments, on a CdMnTe quantum well [5] and on the surface state of a topological insulator Bi₂Se₃ [6], which show features consistent with chiral spin waves.

1. A. Ashrafi and D. L. Maslov, PRL 109, 227201 (2012).
2. A. Ashrafi, E. I. Rashba, and D. L. Maslov, PRB 88, 075115 (2013).
3. S. Maiti, V. A. Zyuzin, and D. L. Maslov, PRB 91, 035106 (2015).
4. S. Maiti and D. L Maslov, PRB 95, 134425 (2017).
5. F. Perez at al., PRL 106, 137204 (2017).
6. H.-H. Kung et al., PRL 119, 136802 (2017)