Work

Geometry-driven modeling of electron localization in InAs/GaAs double quantum dots

Year: 2025

Type: article

Abstract: The coupled electronic states in two-dimensional (2D) and three-dimensional (3D) double quantum dot (DQD) systems are investigated using a phenomenological model applied to InAs/GaAs heterostructures. The single-band k · p effective potential approach previously proposed by our group is employed to numerically calculate the energy spectrum and spatial localization of a single electron, serving as an indicator of the coupling strength within the binary system. For identical quantum dots (QDs) in a DQD, the electronic states exhibit ideal coherence. We systematically vary the DQD geometry and the strength of the confinement potential (via an applied electric field) to examine the effects of symmetry breaking and the sensitivity of electron localization in both identical and nearly identical DQDs. Our results show that coherence in DQDs is highly sensitive to these subtle variations. This sensitivity can be harnessed to detect changes in the surrounding environment, such as fluctuations in chemical or electrical properties that affect the DQD system.

Source: Academia quantum.

DOI: 10.20935/acadquant7862

Authors: Igor Filikhin, Branislav Vlahovic, Tanja Zatezalo, Patrick Flanigan, Jimmie Oxley

Institutions: North Carolina Central University, University of Rhode Island

Language: English

Topic: Semiconductor Quantum Structures and Devices

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: U.S. Department of Energy

Award: NORTH CAROLINA CENTRAL UNIVERSITY CONSORTIUM FOR NUCLEAR SECURITY ADVANCED MANUFACTURING ENHANCED BY MACHINE LEARNING (NSAM-ML) THE PROJECT HAS FOUR MAIN OBJECTIVES: I) BUILD A LARGE RESEARCH BODY CAPABLE OF SOLVING DIFFICULT PROBLEMS RELATIVE TO ADVANCED MANUFACTURING, AND MATERIAL FABRICATION THROUGH HANDLING MOLECULES AND ATOMS AND THANKS TO ADVANCED SCIENCE UNDERSTANDING , II) SOLVE EXTREMELY CHALLENGING MATERIALS PROCESSING PROBLEMS TO ENABLE PRODUCTION OF MATERIALS THAT ARE EFFICIENT FOR NUCLEAR SAFETY AND SECURITY. III) USE MACHINE LEARNING TO EXTRACT HIDDEN INFORMATION ON MATERIALS, THAT OTHERWISE HINDER ADVANCED MANUFACTURING, WHICH REQUIRE DEEP KNOWLEDGE OF THE MATERIALS BEHAVIOR AT ALL SCALES (FROM MICRO TO NANO TO ATOMIC SCALE), IV) BUILD CAPACITY THAT ENABLES PARTNERING UNIVERSITY TO CREATE A PIPELINE THAT IMMERSES YOUNGER GENERATION IN NNSA FIELDS AND RETAIN THEM IN THE PIPELINE BY GETTING THEM INTERESTED IN RESEARCH. PROPOSED PROJECTS AND TASKS INVESTIGATE AND SUPPORT THE THEME OF STUDYING NANOMATERIALS AND REACHING STRONG UNDERSTANDING OF THE MATERIALS INTRICACIES AND FABRICATIONS CONDITIONS. TOGETHER THEY ALLOW DEVELOPING NEW PROCESSES FOR GROWING NEW NANOMATERIALS WITH OUTSTANDING FUNCTIONALITIES. THE CONSIDERED ADVANCED MANUFACTURING, INCLUDES LASER ABLATION, ADDITIVE AND SUBTRACTIVE MANUFACTURING, ELECTRON BEAM MODIFICATION OF NANOSTRUCTURE, AND MANY NANOSCALE CHEMISTRY PROCESSING. THE PROJECT AIMS AT GENERATING NEW TYPE OF MANUFACTURING METHODS, AND ATTAIN DETAILED KNOWLEDGE OF PROCESSES AT THE MOLECULAR AND ATOMIC LEVELS. MOST OF THE TARGETED MATERIALS AND DEVICES DO SERVE THE PROTECTION AND SAFE GUARDING NUCLEAR INFRASTRUCTURE.