Article
Physics, Applied
I Shlyakhov, S. Achra, N. Bosman, I Asselberghs, C. Huyghebaert, I Radu, J. Chai, M. Yang, S. J. Wang, A. Bol, K. Iakoubovskii, M. Houssa, A. Stesmans, V. V. Afanas'ev
Summary: Understanding the energy alignment of electronic bands in metal/MoS2/insulator stacks is crucial for the design of MoS2-based electronic devices. Internal photoemission spectroscopy (IPE) has been applied to analyze the barrier heights, allowing for a simple explanation of electron injection at the interface between aluminum and 1ML MoS2 based on relative energy positions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Hongrun Zhang, Zhijian Shi, Zhicheng Jiang, Ming Yang, Jingwei Zhang, Ziyuan Meng, Tonghua Hu, Fucai Liu, Long Cheng, Yong Xie, Jincheng Zhuang, Haifeng Feng, Weichang Hao, Dawei Shen, Yi Du
Summary: This study reports the appearance of flat bands (FBs) in 2D geometrically frustrated systems caused by quantum destructive interference (QDI), providing experimental evidence of the complete electronic QDI induced FB contributed by the 2D breathing-kagome layers of Nb atoms in Nb3TeCl7 (NTC). It also establishes the tunable roles of the on-site energy over Nb sites on bandwidth, energy position, and topology of FBs in NTC, demonstrating the potential to manipulate FB characteristics in 4d transition-metal-based breathing-kagome materials.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Applied
Yassine Raoui, Hamid Ez-Zahraouy, Samrana Kazim, Shahzada Ahmad
Summary: Mixed cation and anion based perovskites solar cells show enhanced stability outdoors, but limited power conversion efficiency. Adjusting the electron band offset between the charge transport layers can improve performance.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Yan Fang, Yuxin Liu, Lu Qi, Yurui Xue, Yuliang Li
Summary: Graphdiyne (GDY), as a new member of carbon allotropes, possesses unique chemical and electronic structures and has found applications in energy, catalysis, environmental science, and electronic devices. It has been recognized for its scientific value and development potential.
CHEMICAL SOCIETY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Xiaying Lyu, Yaolong Li, Pengzuo Jiang, Jianing Zhang, Xiulan Liu, Xiaofang Li, Hong Yang, Guowei Lu, Xiaoyong Hu, Liangyou Peng, Qihuang Gong, Yunan Gao
Summary: In this work, the ultrafast carrier dynamics of elemental semiconductor tellurium were revealed using time- and energy-resolved photoemission electron microscopy. Two discrete sub-bands around the Γ point of the conduction band were found to be involved in the ultrafast relaxation of excited-state electrons.
Article
Chemistry, Multidisciplinary
Jaehyung Yu, Edmund Han, M. Abir Hossain, Kenji Watanabe, Takashi Taniguchi, Elif Ertekin, Arend M. van der Zande, Pinshane Y. Huang
Summary: By introducing low-friction twisted or heterointerfaces, the bending stiffness of 2D heterostructures can be tailored, making them more deformable than conventional thin-film electronic devices. Research shows that when each atomic layer is separated by heterointerfaces, the total bending stiffness reaches a theoretical minimum, transferring the extreme deformability of 2D monolayers to device-compatible multilayers.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Antonija Grubisic-Cabo, Matteo Michiardi, Charlotte E. Sanders, Marco Bianchi, Davide Curcio, Dibya Phuyal, Magnus H. Berntsen, Qinda Guo, Maciej Dendzik
Summary: 2D materials provide a platform to study novel physical phenomena arising from quantum confinement. This article reports a simple method for in situ exfoliation in ultra-high vacuum, which yields large-area, single-layered films of high quality. This approach enables the study of air-sensitive 2D materials and the control of substrate-2D material twist angle.
Article
Multidisciplinary Sciences
Kritika Vijay, Durga Sankar Vavilapalli, Ashok Arya, S. K. Srivastava, Rashmi Singh, Archna Sagdeo, S. N. Jha, Kranti Kumar, Soma Banik
Summary: The idea of manipulating spins in magnetic two-dimensional van der Waal materials through strain has led to the development of new generation spintronic devices. Magneto-strain effects arise due to thermal fluctuations and magnetic interactions, influencing the lattice dynamics and electronic bands. In this study, the mechanism of magneto-strain effects in CrGeTe3, a vdW material, across the ferromagnetic transition is investigated. It is found that an isostructural transition occurs in CrGeTe3 with lattice modulation during the ferromagnetic ordering. The in-plane lattice contraction leads to magnetocrystalline anisotropy, while the electronic structure exhibits band shifts, broadening, and twinned bands in the ferromagnetic phase.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Falk Niefind, Qian Mao, Nadire Nayir, Malgorzata Kowalik, Jung-Joon Ahn, Andrew J. Winchester, Chengye Dong, Rinu A. Maniyara, Joshua A. Robinson, Adri C. T. van Duin, Sujitra Pookpanratana
Summary: This study investigates the de-intercalation processes of 2D Ag and Ga metals sandwiched between bilayer graphene and SiC. The results show distinctly different dynamics for Ag and Ga, with Ag exhibiting reversible de- and re-intercalation through circular defects, whereas Ga shows irreversible de-intercalation with faster kinetics influenced by the non-circular shape of the defect. Molecular dynamics simulations and calculations support these findings and provide insights into the role of the thermophysical properties of the intercalants and their interaction with defective graphene.
Article
Physics, Multidisciplinary
Sam Azadi, N. D. Drummond, W. M. C. Foulkes
Summary: Landau's Fermi liquid theory explains the main properties of quasiparticle excitations in an electron gas, which are crucial for understanding the behavior of metallic systems. Diffusion Monte Carlo methods were used in this study to calculate the effective mass of three-dimensional homogeneous electron gases as a function of density, showing a decrease in effective mass at lower densities, especially in the case of ferromagnetism.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Jianting Lu, Zexiang Deng, Qiaojue Ye, Zhaoqiang Zheng, Jiandong Yao, Guowei Yang
Summary: This study proposes an ingenious dielectric engineering strategy to enhance the photosensitivity of 2D materials-based photodetectors, achieving significant performance improvement. The optimized SiO2/STO(300 nm)-WSe2 photodetector shows dramatically increased responsivity, external quantum efficiency, and detectivity, promising reliable weak light detection. This strategy has been successfully applied to WS2 photodetectors as well, demonstrating broad applicability and highlighting the role of dielectric environment in improving 2D materials-based photodetectors.
Article
Chemistry, Physical
Anelia Kakanakova-Georgieva, Filippo Giannazzo, Giuseppe Nicotra, Ildiko Cora, Gueorgui K. Gueorguiev, Per O. A. Persson, Bela Pecz
Summary: This study successfully demonstrated the formation of a novel 2D indium oxide, achieved through targeted intercalation and deposition of indium atoms at the graphene/SiC interface. A unique structural configuration with two sub-layers of indium atoms was observed, and bonding of oxygen atoms to indium atoms was confirmed. The 2D indium oxide exhibited a wide bandgap energy of 4.1 eV as estimated by conductive atomic force microscopy measurements.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
V. L. Alperovich, D. M. Kazantsev, A. G. Zhuravlev, L. D. Shvartsman
Summary: The effect of jump in electron mass on electron transfer through interfaces with positive and negative potential steps is studied, emphasizing the importance of non-zero potential steps and suggesting that measuring energy and angular distributions at the state of positive electron affinity is more advantageous.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xi Yan, Friederike Wrobel, I-Cheng Tung, Hua Zhou, Hawoong Hong, Fanny Rodolakis, Anand Bhattacharya, Jessica L. McChesney, Dillon D. Fong
Summary: In this study, the atomic and electronic structures of the SrTiO3 (001) surface were monitored using in situ techniques. It was observed that a 2D electron gas (2DEG) disappears and reappears after the completion of each SrO and TiO2 monolayer, respectively. The presence of a TiO2 double layer and vacancies within the layer contribute to the generation of a surface potential and mobile electrons, explaining this phenomenon. This finding provides insights into the complex oxide interfaces and facilitates atomic-scale defect engineering in oxide electronics.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Eduardo B. Guedes, Stefan Muff, Walber H. Brito, Marco Caputo, Hang Li, Nicholas C. Plumb, J. Hugo Dil, Milan Radovic
Summary: This study investigates the evolution of the electronic structure of a 2-dimensional electron gas (2DEG) on SrTiO3 surfaces, showing a metal-insulator transition around 135 K caused by local structure relaxations. The research presents a new method of tuning the 2DEG via surface vicinality and explores how prospective devices will respond to temperature changes through experimental and theoretical comparisons.
