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Solvent Controlled Generation of Spin Active Polarons in Two-Dimensional Material under UV Light Irradiation.
J Am Chem Soc
June 2024
Regional Centre of Advanced Technologies and Materials, The Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Šlechtitelů 27, Olomouc 779 00, Czech Republic.
Polarons belong to a class of extensively studied quasiparticles that have found applications spanning diverse fields, including charge transport, colossal magnetoresistance, thermoelectricity, (multi)ferroism, optoelectronics, and photovoltaics. It is notable, though, that their interaction with the local environment has been overlooked so far. We report an unexpected phenomenon of the solvent-induced generation of polaronic spin active states in a two-dimensional (2D) material fluorographene under UV light.
View Article and Find Full Text PDFInfrared Resonance Raman of Bilayer Graphene: Signatures of Massive Fermions and Band Structure on the 2D Peak.
Nano Lett
February 2024
Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy.
Few-layer graphene possesses low-energy carriers that behave as massive Fermions, exhibiting intriguing properties in both transport and light scattering experiments. Lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV, we target these massive quasiparticles in the split bands close to the point.
View Article and Find Full Text PDFReal-Time Equation-of-Motion Coupled-Cluster Cumulant Green's Function Method: Heterogeneous Parallel Implementation Based on the Tensor Algebra for Many-Body Methods Infrastructure.
J Chem Theory Comput
April 2023
Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.
We report the implementation of the real-time equation-of-motion coupled-cluster (RT-EOM-CC) cumulant Green's function method [ 2020, 152, 174113] within the Tensor Algebra for Many-body Methods (TAMM) infrastructure. TAMM is a massively parallel heterogeneous tensor library designed for utilizing forthcoming exascale computing resources. The two-body electron repulsion matrix elements are Cholesky-decomposed, and we imposed spin-explicit forms of the various operators when evaluating the tensor contractions.
View Article and Find Full Text PDFNanoscale View of Engineered Massive Dirac Quasiparticles in Lithographic Superstructures.
ACS Nano
November 2022
Department of Physics and Astronomy, Aarhus University, 8000Aarhus C, Denmark.
Massive Dirac fermions are low-energy electronic excitations characterized by a hyperbolic band dispersion. They play a central role in several emerging physical phenomena such as topological phase transitions, anomalous Hall effects, and superconductivity. This work demonstrates that massive Dirac fermions can be controllably induced by lithographically patterning superstructures of nanoscale holes in a graphene device.
View Article and Find Full Text PDFCatalyst-free synthesis of sub-5 nm silicon nanowire arrays with massive lattice contraction and wide bandgap.
Nat Commun
June 2022
Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, USA.
Article Synopsis
- * Researchers successfully created dense, vertically aligned silicon nanowires under 5 nm in diameter using a catalyst-free chemical vapor etching process, achieving a remarkable aspect ratio greater than 10,000.
- * These silicon nanowires demonstrate unique properties, including a 20% lattice reduction, superior oxidation stability, and strong optoelectronic characteristics, suggesting potential applications in nanoelectronics, optoelectronics, and energy systems.
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