Mardonov Sh, Modugno M, Sherman E Ya
Department of Physical Chemistry, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain.
The Samarkand Agriculture Institute, 140103 Samarkand, Uzbekistan.
Phys Rev Lett. 2015 Oct 30;115(18):180402. doi: 10.1103/PhysRevLett.115.180402. Epub 2015 Oct 26.
Disorder plays a crucial role in spin dynamics in solids and condensed matter systems. We demonstrate that for a spin-orbit coupled Bose-Einstein condensate in a random potential two mechanisms of spin evolution that can be characterized as "precessional" and "anomalous" are at work simultaneously. The precessional mechanism, typical for solids, is due to the condensate displacement. The unconventional anomalous mechanism is due to the spin-dependent velocity producing the distribution of the condensate spin polarization. The condensate expansion is accompanied by a random displacement and fragmentation, where it becomes sparse, as clearly revealed in the spin dynamics. Thus, different stages of the evolution can be characterized by looking at the condensate spin.
