Fig. 1
a An STM image of Bi2Te3/ NbSe2. b Sketch of the heterostructure. c Line profile of Bi2Te3/ NbSe2 at position indicated by the black dashed line in (a). d The dependence of Fermi level on the thickness of Bi2Te3 (reprinted with permission from ref. 16, copyright 2015 by the American Physical Society)
