data for Intrinsic Switchable Valley Polarized Photocurrent in ε-InSe

Usually, the inequivalent valley ‘states’ in transition metal disulfides (TMDs) could be manipulated by external magnetic fields by controlling the valley-polarized carriers in spin-coupled valleys. Here, we found the valley polarization of the photocurrent in ε-InSe could be intrinsically manipulated without the external field by the all-optical contactless method.

The transient circular photogalvanic effect (CPGE) induced photocurrent revealed by terahertz emission could be reversed only by selected pumping carriers from vertically split valence bands into different Rashba valleys. The switchable Rashba valley polarization, i. e. the optical orienting valley degree of freedom, could be fulfilled by the synergetic effects between momentum-dependent Zeeman-like field due to the emergent nonzero Berry curvature and the Rashba splitting.