Silicon Atomic Clock Using Spin-Dependent Recombination Detection
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Solution Overview
Problem
Conventional atomic clocks face integration challenges due to their size, power consumption, and reliance on conventional laser sources, limiting their use in electronic devices.
Innovation Solution
The development of a silicon-based atomic clock that utilizes a single-isotope silicon crystal doped with impurity atoms, where energy level transitions are excited with non-resonant energy sources such as thermal energy or broadband light, and detected through spin-dependent recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser sources are used in atomic clocks, then frequency stability is improved, but device size and power consumption increase
Solution Approach 1:
The patent changes the excitation method from resonant laser excitation to non-resonant excitation combined with spin-dependent recombination detection. This parameter change allows the system to achieve atomic clock functionality without requiring high-power resonant laser sources, thereby reducing power consumption while maintaining frequency stability through the spin-dependent recombination signal.
Solution Approach 2:
The patent replaces the optical detection system with an electrical detection system based on spin-dependent recombination. Instead of using optical methods to detect atomic transitions, the system uses electrical measurements of recombination currents, which eliminates the need for complex optical components and reduces power consumption.
2Reliability
If conventional laser sources are used in atomic clocks, then frequency stability is improved, but device integration difficulty increases
Solution Approach 1:
The patent replaces the complex optical system with an electrical detection system based on spin-dependent recombination. This substitution integrates the detection function directly into the semiconductor device structure, eliminating the need for external optical components and simplifying device integration while maintaining frequency stability.
Solution Approach 2:
The patent merges the atomic transition detection function with the semiconductor device operation itself. The spin-dependent recombination process occurs within the device structure, combining the atomic clock functionality with the existing device architecture and reducing integration complexity.
3Measurement precision
If resonant excitation is used, then detection precision is improved, but energy waste increases due to non-selective excitation
Solution Approach 1:
The patent introduces spin-dependent recombination as an intermediary process between excitation and detection. Instead of directly detecting resonant excitation, the system uses spin state changes that affect recombination probabilities as an intermediary mechanism. This allows selective detection of atomic transitions while reducing energy waste through the spin-filtering effect.
Solution Approach 2:
The patent changes the detection parameter from direct optical absorption to electrical recombination current. This parameter change enables selective detection of atomic transitions through spin-dependent recombination rates, improving measurement precision while reducing energy waste by avoiding non-resonant excitation losses.
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 approach enables a compact, low-power atomic clock suitable for integration with electronic devices, offering stable frequency references with narrow resonance widths.
Implementation Method 1
detecting the energy level transition based at least in part on a spin-dependent recombination in such single-isotope silicon crystal
Implementation Method 2
providing a first magnetic field with the use of a first magnetic coil that surrounds at least a portion of the silicon crystal—for example, to drive a hyperfine resonance of the impurity atoms
Implementation Method 3
providing a first magnetic field with the use of a first magnetic coil
Implementation Method 4
measuring a current of a p-n junction formed in the silicon crystal (where such current is dependent on the recombination rate in the space charge region of the p-n junction)
Data Source
AI summary
A silicon-based atomic clock for use in an electronic device structured to employ spin-dependent recombination in the silicon crystal. In at last one implementation, a source of energy configured to excite the impurity atoms within the silicon crystal includes a source of thermal energy but not a source of light or a source of broadband light that is not matched to said energy level transition of the impurity atoms.