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Resonant Auger Decay in Benzene.
J Phys Chem A
January 2025
Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
We present ab initio calculations of the resonant Auger spectrum of benzene. In the resonant process, Auger decay ensues following the excitation of a core-level electron to a virtual orbital. Hence, resonant Auger decay gives rise to higher-energy Auger electrons compared to nonresonant decay.
View Article and Find Full Text PDFFree Carrier Auger-Meitner Recombination in Monolayer Transition Metal Dichalcogenides.
Nano Lett
January 2025
Wyant College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, United States.
Microscopic many-body models based on inputs from first-principles density functional theory are used to calculate the carrier losses due to free carrier Auger-Meitner recombination (AMR) processes in Mo- and W-based monolayer transition metal dichalcogenides as a function of the carrier density, temperature, and dielectric environment. Despite the exceptional strength of Coulomb interaction in the two-dimensional materials, the AMR losses are found to be similar in magnitude to those in conventional III-V-based quantum wells for the same wavelengths. Unlike the case in III-V materials, the losses show nontrivial density dependencies due to the fact that bandgap renormalizations on the order of hundreds of millielectronvolts can bring higher bands into or out of resonance with the optimal energy level for the AMR transition, approximately one bandgap from the lowest band.
View Article and Find Full Text PDFSize-Dependent Multiexciton Dynamics Governs Scintillation From Perovskite Quantum Dots.
Adv Mater
December 2024
Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, Via R. Cozzi 55, Milano, 20125, Italy.
The recent emergence of quantum-confined nanomaterials in the field of radiation detection, in particular lead halide perovskite nanocrystals, offers scalability and performance advantages over conventional materials. This development raises fundamental questions about the mechanism of scintillation itself at the nanoscale and the role of particle size, arguably the most defining parameter of quantum dots. Understanding this is crucial for the design and optimization of future nanotechnology scintillators.
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.
Ab initio calculations of molecular double Auger decay rates.
J Chem Phys
November 2024
Charles University, Faculty of Mathematics and Physics, Institute of Theoretical Physics, V Holešovičkách 2, 180 00 Prague, Czech Republic.
Article Synopsis
- The Fano-ADC(2,2) method is a new technique for calculating total and partial Auger decay widths in molecular core-hole states, including double Auger decay branching ratios.
- This method uses intermediate state representation for constructing many-electron wave functions and is applicable to different systems like atoms and molecules.
- The results show high accuracy, with a 30% average error in double Auger decay branching ratios compared to experiments, which is considered excellent given the method's complexity and assumptions.
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