Reverse ML Maps Spectral Images to Semiconductor Atomic Structure

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Solution Overview

Problem

First-principles modeling techniques face high computational costs when analyzing large supercells of semiconductor heterostructures with varied atomic environments, making it challenging to predict electronic bands and requiring a costly trial-and-error approach for materials design.

Innovation Solution

A machine-learning-assisted first-principles modeling framework using forward and reverse machine-learning models to establish a direct relationship between atomic environments and electronic bands, enabling rapid prediction of electronic bands from atomic structures and vice versa, leveraging convolutional neural networks and spectral functions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If first-principles modeling techniques are used to analyze semiconductor heterostructures with varied atomic environments, then accuracy of electronic band prediction is improved, but computational cost increases significantly

Engineering Contradiction:
Improveaccuracy of electronic band predictionVSAvoidcomputational cost
Core Design Contradiction:
Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent creates a machine learning model that copies the predictive capability of expensive first-principles calculations. The model is trained on a dataset of electronic band structures computed using first-principles methods, allowing it to predict electronic bands for new atomic environments without performing the full calculation each time. This copying approach maintains accuracy while dramatically reducing computational cost.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent performs preliminary computation of electronic band structures for a comprehensive dataset of atomic environments using first-principles methods. These pre-computed results are stored and used to train the machine learning model. When predicting electronic bands for new materials, the model retrieves from memory rather than performing new expensive calculations, thus preparing work in advance to avoid repeated computational costs.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If first-principles modeling is used to explore atomic environment effects on electronic bands, then reliability of material design is improved, but time required for trial-and-error increases

Engineering Contradiction:
Improvereliability of material designVSAvoidtime for trial-and-error cycle
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the mechanical trial-and-error process of iterative modeling with a machine learning-based predictive system. Instead of performing repeated first-principles calculations for different atomic environments, the system uses a trained neural network to instantly predict electronic band structures, substituting the computational mechanical process with an information-based prediction system that maintains reliability while eliminating time-consuming iterations.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements a feedback loop where machine learning predictions are validated against experimental ARPES data. When predictions match experimental observations, the model confidence increases and can guide material design more reliably. This feedback mechanism allows the system to learn from experimental results and improve its predictions, reducing the need for extensive trial-and-error while maintaining high reliability.

Inventive Principle:
Principle #23Feedback

3Adaptability or versatility

If comprehensive exploration of atomic environments is performed using first-principles methods, then understanding of structure-band relationship is improved, but computational resources consumed increase

Engineering Contradiction:
Improveunderstanding of structure-band relationshipVSAvoidcomputational resources
Core Design Contradiction:
Adaptability or versatilityVSUse of energy by stationary object

Solution Approach 1:

The patent trains a machine learning model to copy the comprehensive understanding of structure-band relationships that would otherwise require extensive first-principles calculations. The model learns from a training dataset that covers various atomic environments, structural imperfections, and lattice mismatch conditions, enabling it to provide versatile predictions across different material systems without consuming the computational resources required to generate the training data for each new case.

Inventive Principle:
Principle #26Copying

Data Source

PatentUS20250245404A1Machine-learning-based system and method for determining atomic structure from images of spectral functions
Publication Date: 2025.07.31 THE REGENTS OF THE UNIVERSITY OF COLORADO
  • US20250245404A1 patent drawing
  • US20250245404A1 patent drawing
  • US20250245404A1 patent drawing

AI summary

A method for determining atomic structure uses a reverse machine-learning model (MLM) that is trained to transform images of spectral functions into atomic descriptors that describe a semiconductor heterostructure, superlattice, or bulk material. The method includes feeding, into a trained machine-learning model, an image of a spectral function of a semiconductor heterostructure. The trained machine-learning model, in response to being fed the image, outputs a set of atomic descriptors for one atom of a plurality of atoms forming a supercell of the semiconductor heterostructure. The set of atomic descriptors include an elemental descriptor that identifies an element type of the one atom. The set of atomic descriptors also include structural descriptors, each of which quantifies a structural relationship between (i) the one atom and (ii) one or more other atoms of the plurality of atoms forming the supercell. The reverse MLM may be implemented as a convolutional neural network.