Localization of helical edge states in the absence of external magnetic field

A.V. Bubis, 2 N.N. Mikhailov, 4 S.A. Dvoretsky, A.G. Nasibulin, 5 and E.S. Tikhonov ∗ Skolkovo Institute of Science and Technology, Nobel str. 3, 143026, Moscow, Russian Federation Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russian Federation Institute of Semiconductor Physics, Novosibirsk 630090, Russian Federation Novosibirsk State University, Novosibirsk 630090, Russian Federation Aalto University, P. O. Box 16100, 00076 Aalto, Finland