Thermal Diode Junction Heating for Cryogenic Directional Current
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Solution Overview
Problem
Conventional methods are inefficient for implementing high voltage drivers at cryogenic temperatures and resolving photon number detection in quantum systems, as they lack directionality and operate within limited temperature ranges.
Innovation Solution
Thermal diodes are developed, thermally coupled with heat sources, allowing for unidirectional current flow and operating across a broader temperature range by utilizing semiconducting materials and superconductors to generate and manage thermal energy, enabling high voltage drivers and photon number resolving detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional superconductors are used to operate at cryogenic temperatures, then zero electrical resistance is achieved, but directionality and unidirectional current flow are lost
Solution Approach 1:
The patent combines superconducting materials with semiconducting materials to create a composite thermal diode structure. The superconducting portion provides zero electrical resistance at cryogenic temperatures, while the semiconducting portion with its p-n junction provides directional thermal conduction. This composite approach allows the device to maintain unidirectional current flow capability while operating reliably at cryogenic temperatures with zero electrical resistance.
Solution Approach 2:
The patent introduces a thermal diode as an intermediary component that couples the superconducting circuit to thermal management systems. This thermal diode acts as a mediator that allows heat flow in one direction while blocking it in the opposite direction, thereby providing the necessary directionality control in superconducting systems operating at cryogenic temperatures without disrupting the zero electrical resistance property.
2Ease of operation
If conventional diodes are used to provide directionality, then unidirectional current flow is achieved, but operation at cryogenic temperatures is limited
Solution Approach 1:
The patent employs a composite structure combining superconducting materials and semiconducting materials. The superconducting portion enables operation at cryogenic temperatures with zero electrical resistance, while the semiconducting p-n junction portion maintains unidirectional current flow capability. This composite design extends the operating temperature range to include cryogenic conditions while preserving directional conduction properties.
Solution Approach 2:
The patent utilizes the temperature-dependent properties of superconducting materials, which transition to a zero-resistance state below their critical temperature. By designing the thermal diode to operate in this cryogenic regime, the device achieves both unidirectional current flow and extended temperature range operation, as the superconducting portion remains functional at temperatures where conventional diodes would fail.
3Productivity
If thermal energy is generated to enable current flow through the diode, then current conduction is improved, but thermal management complexity increases
Solution Approach 1:
The thermal diode structure utilizes the inherent thermal properties of its composite materials to automatically manage heat flow. The semiconducting portion's band gap energy allows it to absorb thermal energy and generate current flow without requiring external thermal management systems. The device essentially manages its own thermal requirements through the physical properties of its materials, reducing overall system complexity.
Solution Approach 2:
The patent exploits the phase transition properties of superconducting materials at their critical temperature. When the superconducting material transitions to its superconducting state, it provides zero electrical resistance, which improves current flow efficiency. This phase transition mechanism enables the device to handle thermal energy efficiently without requiring complex active thermal management, as the material's intrinsic properties manage the thermal-to-electrical energy conversion.
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 thermal diodes effectively operate as high voltage drivers and photon number resolving detectors at cryogenic temperatures, providing unidirectional current and functioning across a wider temperature range than conventional superconductors, enhancing the functionality in quantum systems.
Implementation Method 1
A resistor generates resistive heat as current flows through the resistor. The resistor in this example is thermally-coupled to the P-N junction so that resistive heat from the resistor is transferred to the P-N junction portion of the diode.
Implementation Method 2
The diode and resistor are configured (e.g., sized and doped) so that the band gap for the diode corresponds to the thermal energy (e.g., corresponding to a thermal wavelength) of the resistive heat. In other words, the thermal energy from the resistor is absorbed by the diode to generate a current flow.
Data Source
AI summary
The various embodiments described herein include methods, devices, and systems for fabricating and operating diodes. In one aspect, an electrical circuit includes: (1) a diode component having a particular energy band gap; (2) an electrical source electrically coupled to the diode component and configured to bias the diode component in a particular state; and (3) a heating component thermally coupled to a junction of the diode component and configured to selectively supply heat corresponding to the particular energy band gap.