Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides

TL;DR

This paper demonstrates giant valley-polarized spin splittings in magnetized Janus Pt dichalcogenides induced by EuO substrate proximity, revealing significant spin-valley effects and potential for robust spin transport in low-dimensional semiconductors.

Contribution

The study uncovers large proximity-induced magnetism and valley-polarization effects in Janus Pt dichalcogenides through first-principles simulations, highlighting their potential for spin-valley physics and spintronics.

Findings

Valley-specific spin polarization with large splittings (~hundreds of meV)

Formation of distinct K and K' valleys with unique spin textures

Potential for resilient spin transport mechanisms in low-dimensional materials

Abstract

We reveal giant proximity-induced magnetism and valley-polarization effects in Janus Pt dichalcogenides (such as SPtSe), when bound to the Europium oxide (EuO) substrate. Using first-principles simulations, it is surprisingly found that the charge redistribution, resulting from proximity with EuO, leads to the formation of two K and K$^{'}$valleys in the conduction bands. Each of these valleys displays its own spin polarization and a specific spin-texture dictated by broken inversion and time-reversal symmetries, and valley-exchange and Rashba splittings as large as hundreds of meV. This provides a platform for exploring novel spin-valley physics in low-dimensional semiconductors, with potential spin transport mechanisms such as spin-orbit torques much more resilient to disorder and temperature effects.