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Raman signatures of inversion symmetry breaking structural transition in quasi-1D compound, (TaSe4)3I.
J Phys Condens Matter
January 2025
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S C Mullick Road, Kolkata 700032, INDIA, Kolkata, 700032, INDIA.
The breaking of inversion symmetry combined with spin-orbit coupling, can give rise to intrigu- ing quantum phases and collective excitations. Here, we report systematic temperature dependent Raman scattering and theoretical calculations of phonon modes across the inversion symmetry- breaking structural transitions in a quasi-one-dimensional compound (TaSe4)3I. Our investigation revealed the emergence of three additional Raman-active modes in Raman spectra of the low- temperature (LT) non-centrosymmetric (NC) structure of the material.
View Article and Find Full Text PDFIntrinsic Temperature Dependence of Raman-Active Modes in Individual Isolated Single- and Double-Walled Carbon Nanotubes.
ACS Nano
December 2024
Department of Mechanical Engineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
The intrinsic temperature dependence of Raman-active modes in carbon nanotubes (CNTs), particularly the radial breathing mode (RBM), has been a topic of a long-standing controversy. In this study, we prepared suspended individual CNTs to investigate how their Raman spectra depend on temperature and to understand the effects of environmental conditions on this dependency. We analyzed the intrinsic temperature dependence of the main Raman-active modes, including the RBM, the moiré-activated R feature, and the G-band in double-walled carbon nanotubes (DWCNT) and single-walled carbon nanotubes (SWCNTs) after complete desorption of air.
View Article and Find Full Text PDFThe role of IR inactive mode in W(CO) polariton relaxation process.
Nanophotonics
May 2024
Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA.
Vibrational polaritons have shown potential in influencing chemical reactions, but the exact mechanism by which they impact vibrational energy redistribution, crucial for rational polariton chemistry design, remains unclear. In this work, we shed light on this aspect by revealing the role of solvent phonon modes in facilitating the energy relaxation process from the polaritons formed of a mode of W(CO) to an IR inactive mode. Ultrafast dynamic measurements indicate that along with the direct relaxation to the dark modes, lower polaritons also transition to an intermediate state, which then subsequently relaxes to the mode.
View Article and Find Full Text PDFHigh-quality microresonators can greatly enhance light-matter interactions and are excellent platforms for studying nonlinear optics. Wavelength conversion through nonlinear processes is the key to many applications of integrated optics. The stimulated Raman scattering (SRS) process can extend the emission wavelength of a laser source to a wider range.
View Article and Find Full Text PDFContrasting Ultra-Low Frequency Raman and Infrared Modes in Emerging Metal Halides for Photovoltaics.
ACS Energy Lett
August 2024
Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
Article Synopsis
- Lattice dynamics play a crucial role in the performance of photovoltaic materials by influencing factors like disorder, cooling, recombination, and charge transport.
- The study focuses on soft metal-halide perovskites, which show unique low-frequency Raman spectra, the cause of which has been widely debated.
- Using advanced spectroscopic techniques, the researchers propose that the central Raman peak arises from a combination of broadening of low-energy phonon modes and Bose-Einstein statistics, enhancing our understanding of how light interacts with these materials in solar energy applications.
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