Polarization-Based 2D Electron and Hole Gas Junction for Cryogenic Operation
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Solution Overview
Problem
Conventional electronics fail to operate effectively at sub-4 K temperatures due to the carrier freeze-out effect, which is a limitation in quantum computing as they require different temperature zones for conventional and quantum components, leading to inefficiencies in qubit control and error correction.
Innovation Solution
A semiconductor device is developed with a polarization-based doping system that generates free electrons and holes at the interface of two semiconductor materials with different spontaneous polarizations, allowing for a single device to operate at sub-zero temperatures, eliminating the need for separate temperature zones and conventional electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronics are used at sub-4 K temperatures, then the device structure remains simple, but the device fails to operate due to carrier freeze-out effect
Solution Approach 1:
The patent changes the fundamental operating parameters by using polarization-based doping instead of thermal doping, allowing the semiconductor device to operate at cryogenic temperatures where conventional doped semiconductors would experience carrier freeze-out. The polarization effect maintains high carrier concentration without thermal activation.
Solution Approach 2:
The patent employs composite material structures with different spontaneous polarizations (e.g., AlGaN/GaN heterostructures) to generate polarization-induced carriers at the interface. This composite approach enables operation at sub-4K temperatures by eliminating dependence on thermal carrier generation.
2Adaptability or versatility
If separate temperature zones are used for conventional and quantum components, then each component operates at its optimal temperature, but the system complexity and integration difficulty increase
Solution Approach 1:
The patent merges quantum computing components and control electronics into a single integrated device that operates uniformly at cryogenic temperatures. The polarization-based doping enables both quantum and classical functions to coexist at the same low temperature, eliminating the need for separate temperature zones and complex thermal management.
Solution Approach 2:
The semiconductor device achieves multi-functionality by incorporating both quantum computing elements and control electronics within the same polarization-doped structure. This universal design allows a single device to perform multiple functions at cryogenic temperatures without requiring separate optimized zones.
3Temperature
If polarization-based doping is used to enable sub-zero temperature operation, then operational temperature range is expanded, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating polarization-induced carrier accumulation specifically at the heterostructure interface rather than uniformly throughout the material. This localized effect at the AlGaN/GaN interface enables temperature expansion while concentrating manufacturing precision requirements to a specific region that can be controlled during growth.
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
This solution enables faster computational times for quantum computers by integrating quantum computing hardware on a single control electronics unit, overcoming the limitations of conventional electronics and enhancing error correction and operation efficiency at cryogenic temperatures.
Implementation Method 1
the second III-N layer has spontaneous polarization less than a spontaneous polarization of the first III-N layer, such that two-dimensional hole gas (2-DHG) will be formed at a junction of the first III-N layer to the second III-N layer
Implementation Method 2
the forth III-N layer has spontaneous polarization greater than a spontaneous polarization of the third III-N layer, such that two-dimensional electron gas (2-DEG) will be formed at a junction of the third III-N layer to the forth III-N layer
Implementation Method 3
An Anode is arranged to form an ohmic contact to the 2-DHG at the junction of the first III-N layer to the second III-N layer
Implementation Method 4
A Cathode is arranged to form an ohmic contact to the 2-DEG at the junction of the third III-N layer to the forth III-N layer
Data Source
AI summary
Semiconductor devices including a first region having a first three Nitride (III-N) layer and a second III-N layer, the second III-N layer is over the first III-N. The second III-N layer has spontaneous polarization less than the first III-N layer, such that a two-dimensional hole gas (2-DHG) will be formed at a junction of the first III-N layer to the second III-N layer. An Anode forms an ohmic contact to the 2-DHG. A second region includes a third III-N layer and a forth III-N layer, such that the fourth III-N layer is over the third III-N. The forth III-N layer has spontaneous polarization greater than the third III-N layer, such that two-dimensional electron gas (2-DEG) will be formed at a junction of the third III-N layer to the forth III-N layer. A Cathode forms an ohmic contact to the 2-DEG. The first and second regions are connected at an interface.