Raman spectroscopic studies on the evolution of interlayer coupling and stacking order in twisted bilayers and polytypes of WSe2

Author:

Paul Sourav1ORCID,M. B. Abhijith1ORCID,Ghosh Prasenjit1ORCID,Paromita Chanda Prajna1ORCID,Glavin Nicholas R.2ORCID,Roy Ajit K.2ORCID,Watanabe Kenji3ORCID,Taniguchi Takashi4ORCID,Kochat Vidya1ORCID

Affiliation:

1. Materials Science Centre, Indian Institute of Technology 1 , Kharagpur, West Bengal 721302, India

2. Air Force Research Laboratory, Wright-Patterson Air Force Base 2 , Ohio 45433-7718, USA

3. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki 3 , Tsukuba 305-0044, Japan

4. International Center for Materials Nanoarchitectonics, National Institute for Materials Science 4 , 1-1 Namiki, Tsukuba 305-0044, Japan

Abstract

Twisted 2D bilayers of van der Waals materials, a new class of quantum materials, offer pioneering advances in the field of nanoelectronics and photonics. As these layered materials can have various preferential stacking configurations with varying electronic behavior, it is important to have a characterization technique that can unambiguously probe the stacking order and interlayer interactions in 2D materials and twisted 2D homobilayers. In this work, we show that by using Raman spectroscopy, we can probe variations in the interlayer coupling of bilayer WSe2 stacked at different twist angles. The interlayer interactions are weakest at a twist angle of 30°, and the twisted bilayer system is almost equivalent to two decoupled monolayers of WSe2. Also we demonstrate Raman mapping as a quick imaging tool with capabilities of clear distinction between 2H and 3R polytypes of bilayer WSe2 and can be used to study various kirigami structures and bilayer nucleation centers commonly observed during chemical vapor deposition-based growth of WSe2. This work proves to be beneficial in the characterization of twisted bilayers of 2D materials and offer key insights into the optoelectronic properties of 2D materials and heterostructures.

Funder

Science and Engineering Research Board

DST Nanomission

Asian Office of Aerospace Research and Development

JSPS KAKENHI

Publisher

AIP Publishing

Subject

General Physics and Astronomy

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3