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Exciton-Polaron in a Quasi-One-Dimensional Chain of Hexyl-Diammonium-BiI Octahedra.
J Phys Chem Lett
January 2025
Department of Chemical Sciences, Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400005, India.
Lower-dimensional organic-inorganic hybrid perovskite materials promise to revolutionize the optoelectronics industry due to the tremendous possibilities of exotic control on excitonic properties driven via quantum confinement. Flexible organic cations acting as spacers and stabilizers enhance electron-phonon couplings, further amplifying the potential for modular light-matter interactions in these materials. Herein we unravel the nature of excitons in a quasi-1D chain of corner-sharing bismuth iodide octahedra with an intrinsic quantum well structure stabilized by a hexyl-diammonium cation.
View Article and Find Full Text PDFTunable FSRS measurements with reduced background signals: Using an etalon filter to generate picosecond pump pulses in the 460-650 nm range.
J Chem Phys
December 2024
Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.
Generating wavelength-tunable picosecond laser pulses from an ultrafast laser source is essential for femtosecond stimulated Raman scattering (FSRS) measurements. Etalon filters produce narrowband (picosecond) pulses with an asymmetric temporal profile that is ideal for stimulated resonance Raman excitation. However, direct spectral filtering of femtosecond laser pulses is typically limited to the laser's fundamental and harmonic frequencies due to very low transmission of broad bandwidth pulses through an etalon.
View Article and Find Full Text PDFAnomalous Thermal Transport in Compressed Carbon Phases.
Phys Rev Lett
November 2024
Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA.
Carbon materials display intriguing physical properties, including superconductivity and highly anisotropic thermal conductivity found in graphene. Compressive strain can induce structural and bonding transitions in carbon materials and create new carbon phases, but their interplay with thermal conductivity remains largely unexplored. We investigated the in situ high-pressure thermal conductivity of compressed graphitic phases using picosecond transient thermoreflectance and first-principles calculations.
View Article and Find Full Text PDFAll-Optical Ultrafast Arbitrary Rotation of Hole Orbital Qubits with Direct Phase Control.
Phys Rev Lett
November 2024
State Key Laboratory of Extreme Photonics and Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Article Synopsis
- The study focuses on achieving precise control of a quantum bit (qubit) within quantum dots, an important aspect for advancing photonic quantum information technologies.
- Researchers have successfully demonstrated the ability to perform arbitrary rotations on a hole orbital qubit using short optical pulses, allowing for direct phase control.
- This method utilizes a process called stimulated Raman transitions, enabling fine-tuned control over the angles of the Bloch vector, making orbital states in solid-state quantum emitters useful for fast quantum information processing.
Temperature Dependence of Coherent versus Spontaneous Raman Scattering.
Phys Rev Lett
November 2024
Dipartimento di Fisica, Universitá di Roma "La Sapienza", Roma I-00185, Italy.
Because of their sub picosecond temporal resolution, coherent Raman spectroscopies have been proposed as a viable extension of spontaneous Raman thermometry, to determine dynamics of mode specific vibrational energy content during out of equilibrium molecular processes. Here we show that the presence of multiple laser fields stimulating the vibrational coherences introduces additional quantum pathways, resulting in destructive interference. This ultimately reduces the thermal sensitivity of single spectral lines, nullifying it for harmonic vibrations and temperature independent polarizability.
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