Twist angle-dependent transport properties of twisted bilayer graphene

IF 8.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Npg Asia Materials Pub Date : 2024-07-12 DOI:10.1038/s41427-024-00556-6
Jin Hong Kim, Seoung-Hun Kang, Duhee Yoon, Hakseong Kim, Jin-Soo Kim, Mohd Musaib Haidari, Dong Jin Jang, Jin-Yong Ko, Young-Woo Son, Bae Ho Park, Jin Sik Choi
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Abstract

Twisted bilayer graphene (tBLG) with small twist angles has attracted significant attention because of its unique electronic properties arising from the formation of a moiré superlattice. In this study, we systematically characterized the twist-angle-dependent electronic and transport properties of tBLG grown via chemical vapor deposition. This characterization included parameters such as the charge-neutral point voltage, carrier concentration, resistance, and mobility, covering a wide range of twist angles from 0° to 30°. We experimentally demonstrated that these parameters exhibited twist-angle-dependent moiré period trends, with high twist angles exceeding 9°, revealing more practically useful features, including improved mobilities compared to those of single-layer graphene. In addition, we demonstrated that the doping states and work functions were weakly dependent on the twist angles, as confirmed by additional first-principles calculations. This study provides valuable insights into the transport properties of tBLG and its potential for practical applications in the emerging field of twistronics.

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扭曲双层石墨烯的扭曲角度输运特性
具有小扭曲角的扭曲双层石墨烯(tBLG)因形成摩尔超晶格而具有独特的电子特性,因而备受关注。在这项研究中,我们系统地描述了通过化学气相沉积法生长的 tBLG 与扭转角相关的电子和传输特性。这种表征包括电荷中性点电压、载流子浓度、电阻和迁移率等参数,涵盖了从 0° 到 30° 的广泛扭曲角范围。我们通过实验证明,这些参数表现出与扭转角相关的摩尔期趋势,高扭转角超过 9°,揭示了更多实际有用的特性,包括与单层石墨烯相比更好的迁移率。此外,我们还证明了掺杂态和功函数与扭转角的微弱相关性,这一点也得到了更多第一性原理计算的证实。这项研究为了解 tBLG 的传输特性及其在新兴双电子学领域的实际应用潜力提供了宝贵的见解。
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来源期刊
Npg Asia Materials
Npg Asia Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
15.40
自引率
1.00%
发文量
87
审稿时长
2 months
期刊介绍: NPG Asia Materials is an open access, international journal that publishes peer-reviewed review and primary research articles in the field of materials sciences. The journal has a global outlook and reach, with a base in the Asia-Pacific region to reflect the significant and growing output of materials research from this area. The target audience for NPG Asia Materials is scientists and researchers involved in materials research, covering a wide range of disciplines including physical and chemical sciences, biotechnology, and nanotechnology. The journal particularly welcomes high-quality articles from rapidly advancing areas that bridge the gap between materials science and engineering, as well as the classical disciplines of physics, chemistry, and biology. NPG Asia Materials is abstracted/indexed in Journal Citation Reports/Science Edition Web of Knowledge, Google Scholar, Chemical Abstract Services, Scopus, Ulrichsweb (ProQuest), and Scirus.
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