Semiconductor-Superconductor Hybrid Device Side-Junctions
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Solution Overview
Problem
Detecting topological behavior in semiconductor-superconductor hybrid systems is challenging, particularly due to the difficulty in performing non-local conductance measurements.
Innovation Solution
A semiconductor-superconductor hybrid device is designed with a semiconductor component hosting a 2-dimensional electron gas or hole gas, a superconductor component inducing superconductivity by proximity effect, and a set of depletion gates defining a channel region. The device includes helper gates to connect the channel region to leads, allowing for non-local conductance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional T-shaped superconductor geometry with end junctions is used, then local conductance measurements can be performed, but non-local conductance measurements are difficult to implement
Solution Approach 1:
The device is segmented into distinct functional regions: a channel region for hosting the topological phase, lead regions for electrical connections, and junction regions where they meet. This segmentation is achieved through selective depletion gate placement that creates spatially separated functional zones, enabling independent optimization of each region for its specific purpose.
Solution Approach 2:
Depletion gates serve as intermediary elements that mediate between the superconductor component and the semiconductor channel. By depleting charge carriers in specific regions, these gates create the necessary potential landscapes to form both the channel and the leads, and to define the junctions where they connect.
2Adaptability or versatility
If depletion gates are used to define channel region boundaries, then non-local conductance measurements become possible, but device fabrication complexity increases
Solution Approach 1:
The depletion gates serve multiple functions: they define the channel region boundaries, create the lead regions, and form the junctions between them. This multi-functionality reduces the need for separate structures for each function, simplifying the overall device architecture while enabling versatile measurement capabilities.
Solution Approach 2:
The invention transitions from one-dimensional channel definitions to two-dimensional spatial control using gate arrays. By positioning gates in specific two-dimensional patterns around the channel, the invention creates complex three-dimensional potential landscapes that define both channel and lead regions simultaneously.
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 device enables easier detection of topological phases by facilitating non-local conductance measurements, which is crucial for characterizing the electronic properties of semiconductor-superconductor hybrid systems.
Implementation Method 1
a superconductor component arranged over the semiconductor component, the superconductor component being capable of inducing superconductivity in a channel region of the semiconductor component by proximity effect
Implementation Method 2
a set of depletion gates arranged over the semiconductor component, the set of depletion gates being configured to define boundaries of the channel region by depleting charge carriers from regions of the semiconductor component around the perimeter of the channel region
Implementation Method 3
The role of the magnetic field is to lift the spin degeneracy in the semiconductor. Degeneracy in the context of a quantum system refers to the case where different quantum states have the same energy level. Lifting the degeneracy means causing such states to adopt different energy levels. Spin degeneracy refers to the case where different spin states have the same energy level. Spin degeneracy can be lifted by means of a magnetic field, causing an energy level spilt between the differently spin-polarized electrons. This is known as the Zeeman effect.
Data Source
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AI summary
A semiconductor-superconductor hybrid device (400) comprises a semiconductor component (420) configured to host a 2DEG or a 2DHG; a superconductor component (430) for inducing superconductivity in a channel of the semiconductor component; and a set of depletion gates (452, 545, 456). The superconductor component comprises a grounded strip of superconductor. The depletion gates comprise a first outer gate (452 a, 452 b) for defining a first outer segment of the channel; a second outer gate (456 a, 456b) for defining a second outer segment of the channel; and an inner gate (454 a, 454 b) for defining an inner segment of the channel. The device further comprises a first junction comprising a space between the first outer gate and the inner gate, and a helper gate (470 a) for gating the first space; and a second junction comprising a space between the second outer gate and the inner gate, and a helper gate (470 b) for gating the second space. The helper gates are operable to connect the channel to leads (472 a, 472 b).