Article
Physics, Multidisciplinary
Qi Zheng, Yu-Chen Zhuang, Ya-Ning Ren, Chao Yan, Qing-Feng Sun, Lin He
Summary: In this study, quasibound states in elliptical and circular graphene quantum dots were systematically investigated through experiments and theoretical calculations. It was found that bonding and antibonding molecular collapse states formed by two coupled atomic collapse states, and the antibonding state can change into a Klein-tunneling-induced quasibound state, revealing a deep connection between atomic collapse states and the Klein tunneling.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
R. Garreis, A. Knothe, C. Tong, M. Eich, C. Gold, K. Watanabe, T. Taniguchi, V Fal'ko, T. Ihn, K. Ensslin, A. Kurzmann
Summary: Transport measurements through a few-electron circular quantum dot in bilayer graphene show bunching of conductance resonances in groups of four, eight, and twelve, which are related to the spin and valley degeneracies. As the electron numbers increase, the single-particle ground state evolves into a threefold degenerate minivalley ground state, confirmed by measurements in a magnetic field. The importance of Hund's second rule for spin filling of quantum dot levels is emphasized, highlighting the effects of exchange interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Yongheng Zhang, Xuedong Xie, Junyu Zong, Wang Chen, Fan Yu, Qichao Tian, Qinghao Meng, Can Wang, Yi Zhang
Summary: Investigation of interfacial charge transfer between different layers of graphene and WSe2 revealed that monolayer graphene transferred more electrons to WSe2 compared to bilayer and trilayer graphene. This information is important for understanding charge transfer behaviors in 2D stacking-heterostructures and for the design of future nano-devices based on 2D materials.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Mari Ohfuchi, Shintaro Sato
Summary: This study focuses on the energetics and magnetism of symmetry-protected junction state arrays in graphene nanoribbons, finding that at least eight unit cells are required for antiferromagnetic states. Additionally, a proposed end structure is suggested to avoid disturbing the global topological properties, potentially offering new guidelines and challenges for graphene-based quantum computing.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Christoph Dobner, Gang Li, Mamun Sarker, Alexander Sinitskii, Axel Enders
Summary: We introduce a novel diffusion-controlled on-surface synthesis approach for graphene nanoribbons (GNR), employing two types of precursor molecules that exhibit distinct differences in surface mobilities. This method enables the controlled fabrication of complex GNR heterostructures and has potential applicability to the synthesis of various GNR heterojunctions.
Article
Chemistry, Multidisciplinary
Ruslan D. Yamaletdinov, Yaroslav A. Nikiforov, Lyubov G. Bulusheva, Alexander V. Okotrub
Summary: This paper introduces a successful approach for generating partially fluorinated graphene structures and identifies general structural patterns and conditions for achievement through data analysis. Additionally, a GenCF code is provided to facilitate further research on fluorinated graphene.
Article
Chemistry, Multidisciplinary
Pin-Cheng Lin, Renan Villarreal, Simona Achilli, Harsh Bana, Maya N. Nair, Antonio Tejeda, Ken Verguts, Stefan De Gendt, Manuel Auge, Hans Hofsaess, Steven De Feyter, Giovanni Di Santo, Luca Petaccia, Steven Brems, Guido Fratesi, Lino M. C. Pereira
Summary: The study demonstrates the successful incorporation of substitutional Mn atoms in high-quality epitaxial graphene using ultralow-energy ion implantation. The position of substitutional Mn atoms with respect to the Moire superstructure and the carbon sublattice, as well as their slight displacement towards the Cu surface in the out-of-plane direction, were characterized. The doped graphene retains the Dirac-like band structure of pristine graphene on Cu(111), making it an ideal system for studying the interplay between local magnetic moments and Dirac electrons.
Article
Multidisciplinary Sciences
Dongfei Wang, De-Liang Bao, Qi Zheng, Chang-Tian Wang, Shiyong Wang, Peng Fan, Shantanu Mishra, Lei Tao, Yao Xiao, Li Huang, Xinliang Feng, Klaus Muellen, Yu-Yang Zhang, Roman Fasel, Pascal Ruffieux, Shixuan Du, Hong-Jun Gao
Summary: Stacking layered materials with nonzero interlayer twist angles, such as graphene and transitional metal dichalcogenides, has attracted attention due to their novel physical properties. In this study, we demonstrate that the edge states of twisted bilayer zigzag graphene nanoribbons (TBZGNRs) can be tuned by both the twist angle and the stacking offset. Strong edge state variations in the stacking region are revealed by density functional theory (DFT) calculations and scanning tunneling microscopy. Our work highlights the fundamental differences between 2D and 1D twistronics and encourages further investigation of twisted one-dimensional systems.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Alexa Adamkiewicz, Miriam Raths, Monja Stettner, Marcel Theilen, Lasse Munster, Sabine Wenzel, Mark Hutter, Serguei Soubatch, Christian Kumpf, Francois C. Bocquet, Robert Wallauer, F. Stefan Tautz, Ulrich Hofer
Summary: Time-resolved photoemission orbital tomography provides a unique way to study molecular electron dynamics. By measuring the pump-induced changes in angle-resolved photoemission intensities, the unoccupied molecular states in momentum space can be characterized, and the incoherent temporal evolution of their population can be deduced. The method also allows for analysis of different excitation pathways and can distinguish between incoherent and coherent contributions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Alfred J. H. Jones, Lene Gammelgaard, Mikkel O. Sauer, Deepnarayan Biswas, Roland J. Koch, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Kenji Watanabe, Takashi Taniguchi, Cory R. . Dean, Antti-Pekka Jauho, Peter Boggild, Thomas G. Pedersen, Bjarke S. Jessen, Soren Ulstrup
Summary: This work demonstrates the controllable induction of massive Dirac fermions in a graphene device by lithographically patterning superstructures of nanoscale holes. The band dispersion of these fermions is visualized using angle-resolved photoemission spectroscopy with nanoscale spatial resolution, showing a linear scaling of effective mass with feature sizes. Electrostatic doping enhances the effective hole mass and leads to the observation of an electronic band gap, which is strongly renormalized by carrier-induced screening. This methodology allows for the engineering of band structures of massive Dirac quasiparticles at the nanoscale.
Article
Chemistry, Multidisciplinary
Vladimir V. Shnitov, Maxim K. Rabchinskii, Maria Brzhezinskaya, Dina Yu Stolyarova, Sergey Pavlov, Marina Baidakova, Aleksandr Shvidchenko, Vitaliy A. Kislenko, Sergey A. Kislenko, Pavel N. Brunkov
Summary: This study examines the engineering of 2D materials' electronic structure, focusing on how the introduction of functional groups affects the valence band. Core-level spectroscopy methods and density functional theory modeling are used to reveal the modification of graphene's valence band upon derivatization, with a proposed empirical approach to analyze and predict these effects. The results provide insight into band structure engineering of graphene derivatives and the mechanisms underlying the alteration of 2D materials' valence band structure upon derivatization.
Article
Chemistry, Multidisciplinary
Liangbing Ge, Kun Ni, Xiaojun Wu, Zhengping Fu, Yalin Lu, Yanwu Zhu
Summary: Recent research has shown that under pressure, large-angle twisted bi-layer graphene can exhibit flat bands near the Fermi level, potentially inducing properties such as superconductivity found in smaller-angle twisted bi-layer graphene at ambient pressure. The Fermi velocity is found to decrease monotonically with increasing pressure for large twisted angles.
Article
Chemistry, Physical
A. S. Shkvarin, A. Merentsov, A. A. Titov, N. Tsud, E. G. Shkvarina, P. A. Agzamova, M. S. Postnikov, A. N. Titov
Summary: The electronic structure of the novel intercalation compound Cu0.3ZrTe2 was analyzed using various experimental techniques and theoretical calculations. It was found that the tetrahedral coordination of Cu atoms by Te atoms leads to strong chemical bonding within the ZrTe2 lattice. The stability of the phases characterized by quantum states with a charge density wave and superconductivity is influenced by the coordination of Cu atoms by different atoms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Kensuke Saito, Tomonari Koishi, Jianfeng Bao, Wataru Norimatsu, Michiko Kusunoki, Hideo Kishida, Takeshi Koyama
Summary: This study reveals that bilayer graphene exhibits longer and stronger photoluminescence compared to monolayer graphene in femtosecond excitation, with a higher carrier temperature. This suggests that bilayer graphene has superior light-emitting properties and potential for graphene-based light-emitting devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Meng-Kai Lin, Jun Zhao, Joseph A. Hlevyack, T-C Chiang
Summary: This study reveals that adsorption of selenium vapor on bilayer graphene can create symmetric hybrid clone of the Dirac cones at the zone center. This mechanism provides a method to generate electronic features of scientific and technological interests through gentle surface modification via van der Waals adsorption.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Changhua Bao, Wei Yao, Eryin Wang, Chaoyu Chen, Jose Avila, Maria C. Asensio, Shuyun Zhou
Article
Multidisciplinary Sciences
Yujing Ma, Horacio Coy Diaz, Jose Avila, Chaoyu Chen, Vijaysankar Kalappattil, Raja Das, Manh-Huong Phan, Tilen Cadez, Jose M. P. Carmelo, Maria C. Asensio, Matthias Batzill
NATURE COMMUNICATIONS
(2017)
Article
Multidisciplinary Sciences
Ilya Belopolski, Su-Yang Xu, Nikesh Koirala, Chang Liu, Guang Bian, Vladimir N. Strocov, Guoqing Chang, Madhab Neupane, Nasser Alidoust, Daniel Sanchez, Hao Zheng, Matthew Brahlek, Victor Rogalev, Timur Kim, Nicholas C. Plumb, Chaoyu Chen, Francois Bertran, Patrick Le Fevre, Amina Taleb-Ibrahimi, Maria-Carmen Asensio, Ming Shi, Hsin Lin, Moritz Hoesch, Seongshik Oh, M. Zahid Hasan
Article
Physics, Applied
Hemian Yi, Takashi Komesu, Simeon Gilbert, Guanhua Hao, Andrew J. Yost, Alexey Lipatov, Alexander Sinitskii, Jose Avila, Chaoyu Chen, Maria C. Asensio, P. A. Dowben
APPLIED PHYSICS LETTERS
(2018)
Article
Chemistry, Physical
Iolanda Di Bernardo, Giulia Avvisati, Chaoyu Chen, Jose Avila, Maria Carmen Asensio, Kailong Hu, Yoshikazu Ito, Peter Hines, Josh Lipton-Duffin, Llew Rintoul, Nunzio Motta, Carlo Mariani, Maria Grazia Betti
Article
Materials Science, Coatings & Films
Ashley R. Head, Niclas Johansson, Yuran Niu, Olesia Snezhkova, Shilpi Chaudhary, Joachim Schnadt, Hendrik Bluhm, Chaoyu Chen, Jose Avila, Maria-Carmen Asensio
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2018)
Article
Chemistry, Multidisciplinary
Chaoyu Chen, Jose Avila, Shuopei Wang, Yao Wang, Marcin Mucha-Kruczynski, Cheng Shen, Rong Yang, Benjamin Nosarzewski, Thomas P. Devereaux, Guangyu Zhang, Maria Carmen Asensio
Article
Chemistry, Physical
Chaoyu Chen, Jose Avila, Hakim Arezki, Van Luan Nguyen, Jiahong Shen, Marcin Mucha-Kruczynski, Fei Yao, Mohamed Boutchich, Yue Chen, Young Hee Lee, Maria C. Asensio
Article
Engineering, Electrical & Electronic
Hamoon Hedayat, Davide Bugini, Hemian Yi, Chaoyu Chen, Xingjiang Zhou, Giulio Cerullo, Claudia Dallera, Ettore Carpene
IEEE MAGNETICS LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Youngwoo Kim, Eric Moyen, Hemian Yi, Jose Avila, Chaoyu Chen, Maria C. Asensio, Young Hee Lee, Didier Pribat
Article
Nanoscience & Nanotechnology
H. F. Yang, C. Chen, H. Wang, Z. K. Liu, T. Zhang, H. Peng, N. B. M. Schroter, S. A. Ekahana, J. Jiang, L. X. Yang, V. Kandyba, A. Barinov, C. Y. Chen, J. Avila, M. C. Asensio, H. L. Peng, Z. F. Liu, Y. L. Chen
Article
Multidisciplinary Sciences
Lewis S. Hart, James L. Webb, Sara Dale, Simon J. Bending, Marcin Mucha-Kruczynski, Daniel Wolverson, Chaoyu Chen, Jose Avila, Maria C. Asensio
SCIENTIFIC REPORTS
(2017)
Article
Nanoscience & Nanotechnology
Stefano Agnoli, Alberto Ambrosetti, Tevfik Onur Mentes, Alessandro Sala, Andrea Locatelli, Pier Luigi Silvestrelli, Mattia Cattelan, Sarah Eichfeld, Donna D. Deng, Joshua A. Robinson, Jose Avila, Chaoyu Chen, Maria Carmen Asensio
ACS APPLIED NANO MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
V. Tayari, B. V. Senkovskiy, D. Rybkovskiy, N. Ehlen, A. Fedorov, C. -Y. Chen, J. Avila, M. Asensio, A. Perucchi, P. di Pietro, L. Yashina, I. Fakih, N. Hemsworth, M. Petrescu, G. Gervais, A. Grueneis, T. Szkopek
Article
Materials Science, Multidisciplinary
Ayelet Notis Berger, Erick Andrade, Alexander Kerelsky, Drew Edelberg, Jian Li, Zhijun Wang, Lunyong Zhang, Jaewook Kim, Nader Zaki, Jose Avila, Chaoyu Chen, Maria C. Asensio, Sang-Wook Cheong, Bogdan A. Bernevig, Abhay N. Pasupathy
NPJ QUANTUM MATERIALS
(2018)