Coexisting unconventional Rashba- and Zeeman-type spin splitting in Pb-adsorbed monolayer WSe2

Xiujuan Mao; Jia Li; Ze Liu; Jiaxi Wang; Fuli He; Yafan Wang

doi:10.1088/1361-648X/ac2bc5

Coexisting unconventional Rashba- and Zeeman-type spin splitting in Pb-adsorbed monolayer WSe₂

J Phys Condens Matter. 2021 Nov 1;34(3). doi: 10.1088/1361-648X/ac2bc5.

Authors

Xiujuan Mao¹, Jia Li^{1

2}, Ze Liu¹, Jiaxi Wang², Fuli He², Yafan Wang²

Affiliations

¹ School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, People's Republic of China.
² School of Science, Hebei University of Technology, Tianjin 300401, People's Republic of China.

PMID: 34592719
DOI: 10.1088/1361-648X/ac2bc5

Abstract

Based on first-principles calculations, the unconventional Rashba- and Zeeman-type spin splitting can simultaneously coexist in the Pb-adsorbed monolayer WSe₂system. The first two adsorption configurationst₁andt₂show remarkable features under the spin-orbit coupling, in which two split energy branches show same spin states at the left or right side of Γ, and the spin polarization is reversed for both Rashba band branches. For the second adsorption configuration, an energy gap was observed near the unconventional spin polarization caused by the repelled Rashba bands for avoid crossing, and this gap can produce non-dissipative spin current by applying the voltage. The results fort₂configuration with spin reversal show that the repel band gap and Rashba parameter can be effectively regulated within the biaxial strain range of -8% to 6%. By changing the adsorption distancedbetween Pb and the neighboring Se atom layer, the reduceddcaused the transfer from Rashba-type to Zeeman-type spin splitting. This predicted adsorption system would be promising for spintronic applications.

Keywords: Rashba splitting; adsorption; electronic structure; monolayer WSe2; spin–orbit coupling.