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Spectroscopic Signatures of Phonon Character in Molecular Electron Spin Relaxation.
ACS Cent Sci
December 2024
Division of Chemistry and Chemical Engineering, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.
Spin-lattice relaxation constitutes a key challenge for the development of quantum technologies, as it destroys superpositions in molecular quantum bits (qubits) and magnetic memory in single molecule magnets (SMMs). Gaining mechanistic insight into the spin relaxation process has proven challenging owing to a lack of spectroscopic observables and contradictions among theoretical models. Here, we use pulse electron paramagnetic resonance (EPR) to profile changes in spin relaxation rates ( ) as a function of both temperature and magnetic field orientation, forming a two-dimensional data matrix.
View Article and Find Full Text PDFVibrational Spectrum of Magnesium Monochalcogenide Nanoparticles.
Nanomaterials (Basel)
November 2024
Department of Materials Science, University of Patras, 26504 Patras, Greece.
In this work, the vibrational spectra of magnesium monochalcogenide nanoparticles were examined numerically. The calculations were performed with Density Functional Theory and the examined magnesium monochalcogenide nanoparticles were formed from an initial cubic-like unit with type Mg4Y4, where Y=S,Se,Te, after elongating this unit along one, two, and three vertical directions. Therefore, beyond the initial building block, different groups of magnesium monochalcogenide nanoparticles were examined in the form MgxYx, where x=8,16,24.
View Article and Find Full Text PDFExtraction of the electron excess temperature in terahertz quantum cascade lasers from laser characteristics.
Nanophotonics
April 2024
Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, Israel.
We propose a method to extract the upper laser level's (ULL's) excess electronic temperature from the analysis of the maximum light output power ( ) and current dynamic range Δ = ( - ) of terahertz quantum cascade lasers (THz QCLs). We validated this method, both through simulation and experiment, by applying it on THz QCLs supporting a clean three-level system. Detailed knowledge of electronic excess temperatures is of utmost importance in order to achieve high temperature performance of THz QCLs.
View Article and Find Full Text PDFSnSethermal conductivity from optothermal Raman and Stokes/anti-Stokes thermometry.
Nanotechnology
December 2024
Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States of America.
The optothermal Raman method is useful in determining the in-plane thermal conductivity of two-dimensional (2D) materials that are either suspended or supported on a substrate. We compare this method with the Stokes/anti-Stokes scattering thermometry method, which can play a role in both calibration of Raman peak positions as well as extraction of the local phonon temperature. This work demonstrates that the Stokes/anti-Stokes intensity ratio plays an important role in determining the in-plane thermal conductivity of 2D tin diselenide (SnSe) dry-transferred onto a polished copper (Cu) substrate.
View Article and Find Full Text PDFSpectroscopic Ellipsometry Study of the Temperature Dependences of the Optical and Exciton Properties of MoS and WS Monolayers.
Materials (Basel)
November 2024
Department of Physics, Kyung Hee University, Seoul 02447, Republic of Korea.
The optical properties of MoS and WS monolayers are significantly influenced by fabrication methods, especially with respect to the behavior of excitons at the -point of the Brillouin zone. Using spectroscopic ellipsometry, we obtain the complex dielectric functions of monolayers of these materials from cryogenic to room temperatures over the energy range 1.5 to 6.
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