Article
Materials Science, Multidisciplinary
Seth M. Davis, Yang-Zhi Chou, Fengcheng Wu, Sankar Das Sarma
Summary: We calculate the theoretical contribution of scattering by acoustic phonons to the doping and temperature dependence of electrical resistivity in Bernal bilayer graphene (BBG) and rhombohedral trilayer graphene (RTG). The nontrivial geometric features of the band structures of these systems strongly influence the resistivity's temperature and doping dependencies. Our focus on BBG and RTG is motivated by recent experiments in these systems that have discovered exotic low-temperature superconductivity. The understanding of the influence of band geometry on transport is crucial in these systems.
Article
Materials Science, Multidisciplinary
Shi-Ping Ding, Miao Liang, Zhen Ma, Jing-Tao Lu, Jin-Hua Gao
Summary: Due to the observed superconductivity in alternating twisted trilayer graphene, researchers have recently shown great interest in this material. By replacing one or several single-layered graphene in the trilayer structure with multilayer graphene, a double-twisted multilayer graphene is obtained. The researchers theoretically illustrate that if the double-twisted multilayer graphene possesses mirror symmetry along the z direction like the trilayer graphene, a mirror symmetry decomposition occurs, resulting in the exact decoupling of the system into two subsystems with opposite parity. This mirror symmetry decomposition provides a clear interpretation of the novel features in the moire band structures of the double-twisted multilayer graphene, and also predicts the existence of superconductivity in a specific configuration of the system.
Article
Chemistry, Physical
Xinyu Huang, Wen Zhao, Chongyang Zhu, Xianjue Chen, Xu Han, Jie Xing, Lihong Bao, Lei Meng, Norman N. Shi, Peng Gao, Lei Liu, Xingjiang Zhou, Feng Xu, Feng Ding, Yuan Huang
Summary: This work presents a highly efficient fast-cooling method to create wrinkle networks in layered materials, indicating that wrinkles significantly impact the chemical reactivity and the new wrinkle engineering method can tune the physical and chemical properties of multilayer graphene.
CHEMISTRY OF MATERIALS
(2021)
Article
Multidisciplinary Sciences
Peter Rickhaus, Folkert K. de Vries, Jihang Zhu, Elias Portoles, Giulia Zheng, Michele Masseroni, Annika Kurzmann, Takashi Taniguchi, Kenji Watanabe, Allan H. MacDonald, Thomas Ihn, Klaus Ensslin
Summary: This study discovered a correlated electron-hole state in double-bilayer graphene twisted to 2.37 degrees, where moire states retain much of their isolated bilayer character. This allows the generation of an energetic overlap between narrow isolated electron and hole bands with good nesting properties, leading to the formation of ordered states with reconstructed Fermi surfaces consistent with a density-wave state that can be tuned without introducing chemical dopants.
Article
Materials Science, Multidisciplinary
Tarun Tummuru, Etienne Lantagne-Hurtubise, Marcel Franz
Summary: This study extends the analysis of nodal superconducting bilayers to multilayers and finds that both stackings can host chiral topological superconductivity in their phase diagrams.
Article
Multidisciplinary Sciences
Tianye Huang, Xuecou Tu, Changqing Shen, Binjie Zheng, Junzhuan Wang, Hao Wang, Kaveh Khaliji, Sang Hyun Park, Zhiyong Liu, Teng Yang, Zhidong Zhang, Lei Shao, Xuesong Li, Tony Low, Yi Shi, Xiaomu Wang
Summary: This study reports the direct observation of two new plasmon modes in macroscopic twisted bilayer graphene (tBLG) with a highly ordered moiré superlattice. These modes include chiral plasmons arising from the uncompensated Berry flux of the electron gas under optical pumping, and slow plasmonic modes resulting from interband transitions in AB-stacked domains. These findings are important for understanding the electromagnetic dynamics of small-angle tBLG and enabling strong light-matter interactions in the mid-wave infrared spectral window.
Article
Physics, Multidisciplinary
Junxi Duan, Yu Jian, Yang Gao, Huimin Peng, Jinrui Zhong, Qi Feng, Jinhai Mao, Yugui Yao
Summary: In the study, a giant second-order nonlinear Hall effect dominated by disorder-induced skew scattering was observed in twisted bilayer graphene. The magnitude and direction of the nonlinearity could be effectively tuned by gate voltage, and was mainly determined by the collaboration of static and dynamic disorders.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Multidisciplinary
Xiao-Feng Li, Ruo-Xuan Sun, Su-Yun Wang, Xiao Li, Zhi-Bo Liu, Jian-Guo Tian
Summary: In this review, the authors provide an overview of the progress in theoretical and experimental research on twisted bilayer graphene (TBG). They emphasize the importance of atomic reconstruction in both experimental and theoretical investigations and also discuss the growing interest in twisted multilayer graphene. The review concludes by looking forward to the future development of twisted multilayer graphene.
CHINESE PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yunyang Ye, Xinye Zhang, Leyong Jiang
Summary: This paper achieves magnetically tunable Goos-Hanchen (GH) shift of a reflected beam at terahertz frequencies using a multilayer structure with anisotropic graphene. The GH shift is enhanced by exciting graphene surface plasmon polaritons at the interface between two dielectric materials. By considering the quantum response of graphene, the GH shift can be switched from negative to positive and actively tuned through an external magnetic field or controlling structural parameters. This enhanced and tunable GH shift has promising applications in graphene-based terahertz shift devices and nanophotonics.
Article
Physics, Multidisciplinary
Tomas Lothman, Johann Schmidt, Fariborz Parhizgar, Annica M. Black-Schaffer
Summary: By using atomistic modeling and local electronic interactions, this study investigates twisted bilayer graphene (TBG) and reveals the formation of large moire patterns and flat energy bands that host superconductivity at small twist angles. It also identifies the existence of highly inhomogeneous and nematic superconducting state with both atomic and moire length scale ordering.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
A. Mohapatra, M. S. Ramachandra Rao, Manu Jaiswal
Summary: The presence of twist angles significantly affects the physical properties of two-dimensional materials. This study investigates the influence of turbostratic single-layer graphene content on the in-plane thermal conductivity of a defect-free multilayer graphene system. Results show that the thermal conductivity of AB-stacked graphene decreases exponentially with an increasing fraction of turbostratic single-layer graphene content.
Article
Chemistry, Physical
Nathanael P. Kazmierczak, Madeline Van Winkle, Colin Ophus, Karen C. Bustillo, Stephen Carr, Hamish G. Brown, Jim Ciston, Takashi Taniguchi, Kenji Watanabe, D. Kwabena Bediako
Summary: Twisted bilayer graphene exhibits two-regime reconstruction mechanics based on twist angle, with applied heterostrain accumulating anisotropically in saddle-point regions to generate distinctive striped strain phases. Nanoscale spatial fluctuations in twist angle and uniaxial heterostrain were statistically evaluated, revealing the prevalence of short-range disorder in moire heterostructures. This study provides insights into the twist-angle-dependent electronic behavior and structural relaxation, disorder, and strain in moire materials.
Article
Optics
Zhiyong Wu, Zhengji Xu
Summary: Acoustic plasmon resonances (APRs) can be excited at nanogaps between graphene and metal surfaces by far-field coupling, with mode sizes of a few nanometers and large momentums. Researchers have analyzed the physical process of APR formation in a graphene-dielectric-metal hybrid structure (GDMHS) and developed a simplified model to predict APR wavelengths, greatly improving experimental efficiency. The GDMHS also functions as a plasmon ruler with high sensitivity for detecting ultrasmall changes in dimensions or materials in nanogaps, and can be actively tuned by adjusting the chemical potential of graphene. APR modes have potential applications in enhanced infrared molecule spectroscopy and strong light-matter interactions at the nanoscale.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Trithep Devakul, Patrick J. Ledwith, Li-Qiao Xia, Aviram Uri, Sergio C. de la Barrera, Pablo Jarillo-Herrero, Liang Fu
Summary: We propose magic-angle helical trilayer graphene (HTG) as a platform for realizing exotic correlated topological states of matter, and provide experimental evidence and theoretical explanations.
Article
Chemistry, Multidisciplinary
Xiangyue Liu, Xian Wang, Shengping Yu, Guangzhao Wang, Bing Li, Tiantian Cui, Zhaoyang Lou, Hong Ge
Summary: This study decomposes the global polarizability of twisted bilayer graphene (TBG) and explores the interlayer polarization as a function of twisting angles. The interlayer polarization dominates the polarizability variation during twisting, and the largest interlayer polarization and charge transfer occur in misaligned structures with a small angle corresponding to the first appearance of AB stacking. A derived equation is employed to address the size dependence on the angle corresponding to the largest values in interlayer polarizability and charge transfer.
