Interference Transport in a Two-Dimensional Topological Insulator in a CdHgTe Quantum Well

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Abstract

Interference transport in mesoscopic samples of a two-dimensional topological insulator in CdHgTe quantum wells is studied for the first time. It is established that quasi-ballistic edge transport in such an insulator exists at lengths up to 10 µm. In this transport regime, almost periodic Aharonov–Bohm oscillations caused by the formation of closed loops with a characteristic size of about 200 nm by edge states are found. The phase coherence length in the two-dimensional topological insulator is determined for the first time from the measured temperature dependence of their amplitude.

About the authors

M. S Ryzhkov

Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Email: dimko@isp.nsc.ru
630090, Novosibirsk, Russia; 630090, Novosibirsk, Russia

D. A Kozlov

Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences; Experimental and Applied Physics, University of Regensburg

Email: dimko@isp.nsc.ru
630090, Novosibirsk, Russia; D-93040, Regensburg, Germany

D. A Khudayberdiev

Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences

Email: dimko@isp.nsc.ru
630090, Novosibirsk, Russia

Z. D Kvon

Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Email: dimko@isp.nsc.ru
630090, Novosibirsk, Russia; 630090, Novosibirsk, Russia

N. N Mikhaylov

Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences

Author for correspondence.
Email: dimko@isp.nsc.ru
630090, Novosibirsk, Russia

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