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Updated: Apr 27, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure
Qing Lin He1, Hongchao Liu2, Mingquan He3
11] William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China [2] Nano Science and Technology Program, the Hong Kong University of Science and Technology, Hong Kong, China [3].
Superconductivity was achieved at the interface of a topological insulator and iron-chalcogenide, opening avenues for exploring Majorana fermions. This interface superconductivity, induced by Bi2Te3, exhibits a 2D nature with a transition temperature of 12 K.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Superconductivity at interfaces is crucial for novel quantum devices.
- Topological insulators (TIs) and iron-chalcogenides are promising material classes.
- Exploring TI/iron-chalcogenide interfaces can lead to new physics.
Purpose of the Study:
- To investigate superconductivity at the Bi2Te3/FeTe interface.
- To characterize the nature of the induced superconductivity.
- To assess the potential for realizing Majorana fermions.
Main Methods:
- Fabrication of Bi2Te3/FeTe heterostructures using van der Waals epitaxy.
- Transport measurements to detect superconductivity.
- Analysis of Berezinsky-Kosterlitz-Thouless transitions and critical fields.
Main Results:
- Superconductivity observed at the Bi2Te3/FeTe interface, induced by the Bi2Te3 layer.
- Two-dimensional superconductivity with a transition temperature up to 12 K.
- Evidence for Berezinsky-Kosterlitz-Thouless physics and critical field behavior.
Conclusions:
- The Bi2Te3/FeTe heterostructure is a promising platform for interface superconductivity.
- The study provides a foundation for exploring Majorana fermions.
- Further research is needed to confirm the role of topological surface states.
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