2D Spin Light Emitter With Electrical Circular Polarization Control

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Solution Overview

Problem

Current spin light emitting diodes (spin-LEDs) based on two-dimensional materials fail to meet the criteria of operation at room temperature, do not require a magnetic field, and lack electrical control for circular polarization.

Innovation Solution

A spin light emitting device comprising a two-dimensional Van der Waals heterostructure with a spin injector and a magnetization controller to inject spin-polarized carriers, allowing electrical control of circular polarization through a ferromagnetic layer like Ta/CoFeB, which can switch magnetization states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional spin-LED structures are used, then light emission with circular polarization is achieved, but operation requires low temperature and external magnetic field

Engineering Contradiction:

Improveoperation temperatureVSAvoidpractical applicability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent changes the magnetic anisotropy parameter of the ferromagnetic layer by selecting specific materials (CoFeB, CoFe) and controlling their thickness and composition, enabling out-of-plane magnetization at room temperature without external magnetic field. This parameter change allows the device to operate reliably at practical temperatures.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material structures including ferromagnetic layers (CoFeB, CoFe) combined with non-magnetic metals (Ta, Pt) to create spin injectors with tailored magnetic and electrical properties. The Van der Waals heterostructure combines multiple 2D materials to achieve both room temperature operation and efficient spin injection.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If external magnetic field is applied to control magnetization, then circular polarization is achieved, but device complexity and power consumption increase

Engineering Contradiction:

Improveelectrical control capabilityVSAvoidmagnetic field control system

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/external magnetic field control system with an electrical control system. Current injection through the ferromagnetic layer generates spin-orbit torque that switches magnetization direction, enabling electrical control of circular polarization without external magnetic fields or complex mechanical systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The ferromagnetic layer itself generates the necessary spin-orbit torque through current injection to switch its own magnetization state. The material's intrinsic spin Hall effect or Rashba effect enables self-switching without external assistance, simplifying the control system.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If in-plane magnetized injector is used, then fabrication is simplified, but circular polarization control is limited

Engineering Contradiction:

Improvefabrication simplicityVSAvoidpolarization control capability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent creates a dynamically controllable magnetization orientation that can be switched between in-plane and out-of-plane configurations through current-induced torque. This dynamic control enables versatile polarization output while maintaining compatibility with standard fabrication processes for depositing ferromagnetic layers.

Inventive Principle:

Principle #15Dynamics

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

Enables room temperature operation without a magnetic field and provides electrical control over circular polarization, facilitating applications in cancer detection, quantum cryptography, and quantum computing.

Implementation Method 1

The magnetization state of the spin injector is configured to be capable of being electrically switched

Methodology Applied

Scientific EffectSpin Hall Effect: Hall Effect

Implementation Method 2

a two-dimensional structure configured to emit light in response to carrier injection

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250311313A1Spin light emitting device based on two-dimensional materials

Publication Date: 2025.10.02 LU YUAN

AI summary

Disclosed is a spin light emitting device based on two-dimensional material. The light emitting device comprises: a two-dimensional structure configured to emit circularly polarized light in response to spin-polarized carrier injection, wherein the two-dimensional structure is a two-dimensional Van der Waals heterostructure; a spin injector configured to inject spin-polarized carriers into the two-dimensional Van der Waals heterostructure, wherein the light emitted by the two-dimensional structure has a circular polarization state determined by the magnetization state of the spin injector; and a magnetization controller configured to change the magnetization state of the spin injector. The spin-based light emitting device emits circularly polarized light or single photons on the basis of two-dimensional material at room temperature without introducing a magnetic field, and has the capability of electrical control.