Unlocking twisted 2D materials: a nanoscale exploration of bandgap dynamics

Sonia Conesa-Boj

doi:10.1117/12.2677294

5 October 2023 Unlocking twisted 2D materials: a nanoscale exploration of bandgap dynamics

Sonia Conesa-Boj

Proceedings Volume PC12651, Low-Dimensional Materials and Devices 2023; PC126510A (2023) https://doi.org/10.1117/12.2677294
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

The unique sensitivity of local electronic properties in two-dimensional (2D) materials, such as their bandgap, to the underlying crystal arrangements provide exciting prospects for novel quantum nano-optoelectronic applications. However, the limitations of current characterization techniques in accessing this delicate relationship with nanoscale resolution have made it challenging to understand the impact of local structural phenomena such as strain, thickness, and layer rotation on electronic properties. Here, we present a comprehensive strategy for determining the relationship between bandgap energy and local thickness and strain fields in twisted van der Waals materials. Unveiling these structure/property correlations is crucial for gaining a complete understanding of the rich bandgap dynamics at the nanoscale in these materials. By combining advanced techniques such as electron energy-loss spectroscopy assisted with machine learning and 4D scanning transmission electron microscopy with an Electron Microscopy Pixel Array Detector, we evaluate the bandgap and local strain fields in twisted WS2 with nanoscale resolution. We demonstrate how strain can increase the bandgap by up to 30% in regions with significant twist angles between layers and hence pronounced local strain fields. This approach provides a flexible tool for uncovering the connection between strain and bandgap dynamics in 2D materials and can also be applied to more complex 2D material geometries and heterostructures, contributing to the development of novel technologies for quantum devices.

Conference Presentation

Citation Download Citation

Sonia Conesa-Boj "Unlocking twisted 2D materials: a nanoscale exploration of bandgap dynamics", Proc. SPIE PC12651, Low-Dimensional Materials and Devices 2023, PC126510A (5 October 2023); https://doi.org/10.1117/12.2677294

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

2D materials

Electrical properties

Quantum devices

Quantum fields

Quantum limits

Quantum machine learning

Quantum phenomena

Show All Keywords

Keywords/Phrases

Search In:

Publication Years