Josephson Junction Device Using 2D Material Stacking
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Solution Overview
Problem
Josephson junction devices face challenges in manufacturing due to physical and chemical damage during the process, which affects the control and storage of quantum information, and existing insulators do not effectively prevent such damage.
Innovation Solution
A Josephson junction device is fabricated using a planar arrangement of 2D material layers and a graphene layer, with a distance between junctions optimized for the Josephson effect, and protected by hexagonal-boron nitride layers to prevent damage, utilizing a stamping process for precise arrangement and etching for peripheral removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lithography and metal thin-film deposition are used during manufacturing, then the device structure can be formed, but the Josephson junction device is physically or chemically damaged or deformed
Solution Approach 1:
The patent changes the manufacturing approach from conventional lithography and metal thin-film deposition to a process using 2D material layers (such as NbSe2, FeSe, PdTe2) that can be transferred and assembled without exposing the Josephson junction to damaging conditions. The 2D material structure allows formation of the junction through controlled material transfer and stacking rather than high-energy deposition processes
Solution Approach 2:
The patent introduces 2D material layers as intermediary structures that enable the formation of the Josephson junction without direct exposure to damaging manufacturing processes. These 2D materials serve as protective and functional intermediaries that can be precisely positioned and connected to form the junction structure
2Reliability
If the distance between junctions is reduced to enable Josephson effect, then quantum information control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses thin 2D material films with atomic-layer precision that can be transferred and stacked to achieve precise junction spacing. The 2D material layers provide a naturally thin and uniform structure that enables controlled distances between junctions at the nanometer scale, meeting the precision requirements for Josephson effect while maintaining manufacturability
Solution Approach 2:
The patent transitions from planar 2D manufacturing to 3D stacked architecture using vertically arranged 2D material layers. This dimensional approach allows precise control of junction spacing through layer thickness and stacking position rather than relying solely on lateral patterning precision
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 solution enables the formation of a Josephson junction device free from physical and chemical defects, maintaining the superconducting properties of graphene and allowing for controlled quantum information storage and processing.
Implementation Method 1
a distance between the first junction and the second junction is within a range configured to cause a Josephson effect
Implementation Method 2
The first 2D material layer and the second 2D material layer may each include a material which generates a superconducting proximity effect at the first and second junctions, respectively, to form superconducting electrodes
Data Source
AI summary
A Josephson junction device includes a planar arrangement including a first two-dimensional (2D) material layer, a graphene layer, and a second 2D material layer planarly arranged on a device substrate, the first 2D material layer including at least one layer of a 2D material, the graphene layer forming a first junction with the first 2D material layer, and the second 2D material layer forming a second junction with the graphene layer and including at least one layer of a 2D material. A distance between the first junction and the second junction is within a range configured to cause a Josephson effect.