Topological states induced by local structural modification of the polar BiTeI(0001) surface

This work was supported by the Deutsche Forschungsgemeinschaft through SFB1170 (project A01), and partly by the Tomsk State University competitiveness improvement programme (project No. 8.1.01.201 7), by the Russian Science Foundation (Grants No. 17-12-01047, in part of crystal growth and ARPES measurements (figure 4) and 18-12-00169, in part of DFT calculations), Russian Foundation for Basic Research (Grant No. 17- 02-00729) and Saint Petersburg State University (project 15.61.202.201 5).