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Logarithmic singularities and quantum oscillations in magnetically doped topological insulators
Nandi, D.,Sodemann, Inti,Shain, K.,Lee, G. H.,Huang, K.-F.,Chang, Cui-Zu,Ou, Yunbo,Lee, S. P.,Ward, J.,Moodera, J. S.,Kim, P.,Yacoby, A. American Physical Society 2018 Physical Review B Vol.97 No.8
<P>We report magnetotransport measurements on magnetically doped (Bi, Sb)(2)Te-3 films grown by molecular beam epitaxy. In Hall bar devices, we observe logarithmic dependence of transport coefficients in temperature and bias voltage which can be understood to arise from electron-electron interaction corrections to the conductivity and self-heating. Submicron scale devices exhibit intriguing quantum oscillations at high magnetic fields with dependence on bias voltage. The observed quantum oscillations can be attributed to bulk and surface transport.</P>