О перколяционном режиме объемного транспорта в топологическом изоляторе Bi1.08Sn0.02Sb0.9Te2S

Письма в Журнал экспериментальной и теоретической физики. 2022. Т. 115. № 4. С. 270–276.

Pudalov V., Сахин В. О., Куковицкий Е. Ф., Таланов Ю. И., Тейтельбаум Г. Б., Morgun L., Борисов А. Э., Усольцев А. С.

The formation of nanosized charge droplets in the bulk of a three-dimensional topological insulator
Bi1.08Sn0.02Sb0.9Te2S was evidenced using electron spin resonance. Since electrons and holes are “locked” in
these droplets far apart from each other, their participation in bulk conductivity is possible only due to thermal
activation or to variable range hopping. Our transport measurements give evidence that at relatively high
temperatures conduction follows the activation behavior with the activation energies which due to percolation
may be much smaller than the half of the band gap. We also demonstrate that the variable range hoping
replaces the activated transport at sufficiently low temperatures.

Keywords: Charge transport, topological insulator, топологический изолятор, прыжковая проводимость, hopping conduction, транспорт заряда

Publication based on the results of: Experimental and theoretical studies of quantum effects in low-dimensional systems (2022)