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Localization of trivial edge states in InAs/GaSb composite quantum wells

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Sazgari Ardakani, Vahid and Sullivan, Gerard and Kaya, İsmet İnönü (2019) Localization of trivial edge states in InAs/GaSb composite quantum wells. Physical Review B, 100 (4). ISSN 2469-9950 (Print) 2469-9969 (Online)

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Official URL: http://dx.doi.org/10.1103/PhysRevB.100.041404

Abstract

The InAs/GaSb heterostructure is one of the systems where the quantum spin Hall effect is predicted to arise. However, as confirmed by recent experimental studies, the most significant highlight of the effect, i.e., conductance quantization due to nontrivial edge states, is obscured by spurious conductivity arising from trivial edge states. In this Rapid Communication, we present an experimental observation of the strong localization of trivial edge modes in an InAs/GaSb heterostructure which was weakly disordered by silicon deltalike dopants within the InAs layer. The edge conduction which is characterized by a temperature-independent behavior at low temperatures and a power law at high temperatures is observed to be exponentially scaled with the length of the edge. Comprehensive analyses on measurements with a range of devices is in agreement with the localization theories in quasi-one-dimensional electronic systems.

Item Type:Article
Uncontrolled Keywords:topological insulators, quantum well, quantum spin hall effect, localization
Subjects:Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
ID Code:37511
Deposited By:İsmet İnönü Kaya
Deposited On:28 Aug 2019 12:12
Last Modified:28 Aug 2019 12:12

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