Semiconductor-Superconductor Hybrid Device Edge Contact
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Solution Overview
Problem
Existing semiconductor-superconductor hybrid devices face challenges in achieving a large topological gap and are sensitive to manufacturing variations, which affect the reliability and performance of quantum computing applications.
Innovation Solution
A semiconductor-superconductor hybrid device is designed with a semiconductor layer sandwiched between insulating layers, where the superconductor layer is arranged over an edge of the semiconductor layer to enable energy level hybridization. This configuration improves control over the device geometry and enhances tolerance to manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semiconductor layer is directly exposed without insulating layers, then the device structure is simpler, but the device becomes sensitive to manufacturing variations and cannot achieve large topological gap
Solution Approach 1:
Insulating layers are introduced as intermediary elements between the semiconductor layer and the external environment. These insulating layers act as mediators that isolate the semiconductor-superconductor interface from manufacturing variations and external perturbations, thereby protecting the topological gap while maintaining a controlled geometry for the active region.
Solution Approach 2:
The device structure is segmented into distinct functional regions: the semiconductor layer, the superconductor layer, and the insulating layers. This segmentation allows each component to be optimized independently - the insulating layers provide stability and protection, while the semiconductor-superconductor interface maintains the topological properties, resolving the contradiction between structural complexity and reliability.
2Reliability
If the superconductor layer is arranged to maximize coverage, then better superconducting proximity effect is achieved, but control over device geometry and tolerance to manufacturing variations deteriorates
Solution Approach 1:
The superconductor layer is strategically positioned to cover only the necessary regions for inducing the proximity effect, rather than providing full coverage. The insulating layers are configured to expose specific edges or regions of the semiconductor layer where the superconductor contacts, creating localized high-quality interfaces that maximize the proximity effect while maintaining precise geometric control over the active regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed device structure allows for the optimization of the topological gap and improves the device's tolerance to manufacturing variations, leading to enhanced performance and reliability in quantum computing applications.
Implementation Method 1
The superconductor causes a proximity effect in the adjacent semiconductor, whereby a region of the semiconductor near the interface with the superconductor also exhibits superconducting properties.
Implementation Method 2
Another condition for inducing the topological phase where MZMs can form is the application of a magnetic field in order to lift the spin degeneracy in the semiconductor. Spin degeneracy can be lifted by means of a magnetic field, causing an energy level split between the differently spin-polarized electrons. This is known as the Zeeman effect.
Implementation Method 3
The superconductor layer is arranged over an edge of the semiconductor layer so as to enable energy level hybridisation between the semiconductor layer and the superconductor layer
Data Source
Figure 1~2
Figure 3~4
Figure 5(a)~5(c)
AI summary
A semiconductor-superconductor hybrid device (100) comprises a semiconductor layer (10) arranged in a sandwich structure between first and second insulating layers (16a, 16b), and a superconductor layer (12) arranged over an edge (14) of the semiconductor layer so as to enable energy level hybridisation between the semiconductor and the superconductor. Preferably, a gate electrode (20) for electrostatic control of the energy level hybridisation is also included. The device may be useful in a quantum computer. Also provided is a method of manufacturing the device, and a method of inducing topological behaviour in the device.