Article
Physics, Multidisciplinary
Yawen Guo, Wenqi Jiang, Xinru Wang, Fei Wan, Guanqing Wang, G. H. Zhou, Z. B. Siu, Mansoor B. A. Jalil, Yuan Li
Summary: The electrical modulation of transport properties of silicene nanoconstrictions with different geometrical structures was studied, showing a significant dependence of conductance on the position and width of the nanoconstriction. The symmetrical structure of the central constriction region can induce a resonance effect and increase the system's conductance significantly. A novel two-channel structure was proposed, which outperformed the one-channel structure in terms of conductance.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Maya N. Nair, Arlensiu Celis, Francois Nicolas, Stefan Kubsky, Amina Taleb-Ibrahimi, Antonio Tejeda
Summary: The study investigates the atomic structure and electronic properties of monolayer graphene on a curved multi-nano-vicinal Pt (1 1 1) substrate, revealing that the growth of graphene and its spatial periodicity are influenced by the vicinal angle of the substrate. The superperiodicity of the substrate plays a key role in opening bandgaps in graphene, affecting the linear pi band and minigaps in the electronic properties. These findings suggest a simple method to tune the electronic properties of epitaxial graphene by controlling the substrate vicinality.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jiasheng Zhou, Haipeng Li, Ho-Kin Tang, Lei Shao, Kui Han, Xiaopeng Shen
Summary: In this paper, molecular dynamics simulations were used to investigate the phonon thermal transport in silicene/graphene heterostructures. The results showed that graphene dominates the thermal transport in the heterostructures, and heterostructuring can reduce the thermal conductivity of the graphene layer while increasing the thermal conductivity of the silicene layer. The interlayer interaction strength also affects the thermal conductivity and interfacial thermal resistance in the heterostructures.
Article
Chemistry, Physical
Y. Yang, K. H. Gao, W. J. Wang, G. Yu, Y. Sun, X. H. Zhang, Z. Q. Li
Summary: An anomalous carrier-concentration dependence of electron-electron interactions was observed in epitaxial graphene on SiC, offering a new route to control EEI in graphene.
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
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
Engineering, Environmental
Binbin Sun, Yinqing Zhang, Xinwei Liu, Kunkun Wang, Yi Yang, Lingyan Zhu
Summary: This study systematically investigated the interactions between photoaged graphene oxide (GO) and proteins. The results showed that photoaged GO had stronger binding affinities with proteins, causing more significant changes in the conformational structure and stronger inhibition on fibrillation of proteins. This study provided new insights into the increased ecological risks of photoaged GO.
Article
Physics, Applied
Sake Wang, Nguyen T. Hung, Hongyu Tian, Md Shafiqul Islam, Riichiro Saito
Summary: The proposed device can operate at room temperature, with the advantage of low-voltage operation and high response speed. Additionally, the model has potential applications in room-temperature nanoelectronics.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
E. Karaca, D. Errandonea
Summary: The structural, electronic, phonon, and electron-phonon properties of NaAlGe under high pressure were investigated using density-functional theory simulations. It was found that the electronic states near the Fermi level, responsible for electrical conductivity, are mainly composed of Ge 4d states. The largest contribution to the average electron-phonon coupling parameter comes from Ge-related vibrations, with a calculated value of approximately 0.609. The superconducting critical temperature at ambient pressure was calculated to be 2.31 K, consistent with the experimentally obtained value of 1.80 K. Increasing pressure leads to a decrease in the electronic density of states at the Fermi energy (DOS) and superconductivity is suppressed at 12 GPa. The phonon dispersion at different pressures indicates a dynamical instability at 13 GPa, suggesting a structural phase transition. The high-pressure phase is proposed to be orthorhombic with space group Pnma and does not exhibit superconductivity. The pressure dependence of unit-cell parameters, Raman- and infrared-active phonons of both low-pressure and high-pressure phases is also reported.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Ceramics
Komal K. Jani, Divyesh V. Barad, Pooja Y. Raval, Monika Nehra, Nimish H. Vasoya, Narendra Jakhar, Kunal B. Modi, Sandeep Kumar, Dong-Kwon Lim, Rishi Kumar Singhal
Summary: The electronic structure study of the quadruple perovskite series reveals the valence states of Ti, Cu, and Ca ions, as well as the possible presence of surface atoms and hybridization phenomena. Additionally, oxygen vacancies may partially contribute to the shift in the O1s spectra peaks.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Yinqi Fan, Shuhui Tao, Sylvain Pitie, Chenguang Liu, Chun Zhao, Mahamadou Seydou, Yannick J. Dappe, Paul J. Low, Richard J. Nichols, Li Yang
Summary: This article discusses the significance of quantum interference on molecular conductance and elucidates the impact of different electrode materials and anchor groups on molecular conductance.
Article
Chemistry, Multidisciplinary
Mattia Trama, Vittorio Cataudella, Carmine Antonio Perroni, Francesco Romeo, Roberta Citro
Summary: The electronic structure of the (111) LaAlO3/SrTiO3 interface was calculated using a tight binding supercell approach. The confinement potential at the interface was evaluated through the iterative solution of a discrete Poisson equation. Local Hubbard electron-electron terms were included at the mean-field level within a fully self-consistent procedure. The calculation accurately described the formation of a two-dimensional electron gas near the interface due to quantum confinement and showed agreement with experimental results.
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
Materials Science, Multidisciplinary
Paolo Marconcini, Demetrio Logoteta, Massimo Macucci
Summary: In this study, simulations of shot noise in disordered monolayer graphene devices were conducted to investigate the effect of gate bias voltage. Different device geometries were considered, and results were compared with experimental data to validate predictions made by Tworzydlo et al. The predicted effect has not been observed yet, providing guidelines for future experimental designs.
Article
Materials Science, Multidisciplinary
Xianzhang Chen, Guillaume Weick, Dietmar Weinmann, Rodolfo A. Jalabert
Summary: The effect of a scanning gate microscopy tip on the conductance of graphene nanoribbons and nanoconstrictions is studied. The conductance corrections caused by the tip potential disturbance are expressed explicitly according to scattering states. The results confirm that the second-order term prevails in the conductance plateaus, and resonances appear when the probe potential is beyond the perturbative regime.