Two-dimensional topological insulator state in double HgTe quantum well

Abstract

The two-dimensional topological insulator phase has been observed previously in single HgTe-based quantum wells with inverted subband ordering. In double quantum wells (DQWs), coupling between the layers introduces additional degrees of freedom leading to a rich phase picture. By studying local and nonlocal resistance in HgTe-based DQWs, we observe both the gapless semimetal phase and the topological insulator phase, depending on parameters of the samples and according to theoretical predictions. Our work establishes the DQWs as a promising platform for realization of multilayer topological insulators.

8 pages, 8 figures

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• Phase transitions in two tunnel-coupled HgTe quantum wells. Bilayer graphene analogy and beyond
• Mesoscopic fluctuations of conductance of a helical edge contaminated by magnetic impurities
• Linear magnetoresistance in HgTe quantum wells
• Devices with electrically tunable topological insulating phases
• Tunable quantum spin Hall effect in double quantum wells
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• Interaction dominated transport in 2D conductors: from degenerate to partially-degenerate regime
• Disorder-induced phase transitions in double HgTe quantum wells
• Functionalized Tellurene; a candidate large-gap 2D Topological Insulator
• Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes
• Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices
• Engineering Majorana Kramers Pairs In Synthetic High Spin Chern Insulators
• Higher-order topological insulator in cubic semiconductor quantum wells