Rashba-like dispersion in buckled square lattices

A.S.R., A. C., and A.H.C.N. acknowledge the National Research Foundation, Prime Minister's Office, Singapore, under its Medium-Sized Centre Programme and CRP award "Novel 2D materials with tailored properties: Beyond graphene" (No. R-144-000-295-281). The first-principles calculations were carried out at the Centre for Advanced 2D Materials and Graphene Research Centre high-performance computing facilities. P.Z.H., D.K.C., and H.S.P. acknowledge the support of the Physics and Mechanical Engineering Departments at Boston University and the Boston University High Performance Shared Computing Cluster. D.K.C. acknowledges the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611, where part of this work was completed. P.Z.H is grateful for hospitality of the NUS Centre for Advanced 2D Materials and Graphene Research Centre, where this work was initiated. (Physics and Mechanical Engineering Departments at Boston University; Boston University High Performance Shared Computing Cluster; PHY-1607611 - National Science Foundation; R-144-000-295-281 - CRP award "Novel 2D materials with tailored properties: Beyond graphene")