Results 41 to 50 of about 103,476 (250)

Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO [PDF]

, 2006
We present optically-pumped emission data for ZnO, showing that high excitation effects and stimulated emission / lasing are observed in nanocrystalline ZnO thin films at room temperature, although such effects are not seen in bulk material of better ...
de Posada, Eduardo, Henry, Martin O., Lunney, James G., McGlynn, Enda, Mosnier, Jean-Paul, Tobin, Gerard   +5 more
core   +1 more source

Moiré excitons and exciton–polaritons: a review

Journal of Physics: Condensed Matter
Abstract Distinguished by their long lifetimes, strong dipolar interactions, and periodic confinement, moiré excitons are fertile ground for realising interaction-driven excitonic phases beyond conventional semiconductor systems. Formed in twisted or lattice-mismatched van der Waals heterostructures, these excitons are shaped by a ...
Saúl A Herrera-González, Hugo A Lara-García, Giuseppe Pirruccio, David A Ruiz-Tijerina, Arturo Camacho-Guardian   +4 more
openaire   +3 more sources

Continuous and discontinuous dark solitons in polariton condensates [PDF]

, 2014
Bose-Einstein condensates of exciton-polaritons are described by a Schr\"odinger system of two equations. Nonlinearity due to exciton interactions gives rise to a frequency band of dark soliton solutions, which are found analytically for the lossless ...
Komineas, Stavros, Shipman, Stephen P., Venakides, Stephanos   +2 more
core   +3 more sources

Linear scaling approach for optical excitations using maximally localized Wannier functions

JPhys Materials, 2023
We present a theoretical method for calculating optical absorption spectra based on maximally localized Wannier functions, which is suitable for large periodic systems.
Konrad Merkel, Frank Ortmann
doaj   +1 more source

Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

, 2010
We have shown theoretically that efficient multiple exciton generation (MEG) by a single photon can be observed in small nanocrystals (NCs). Our quantum simulations that include hundreds of thousands of exciton and multi-exciton states demonstrate that ...
Alexander L. Efros, Andrew Shabaev, C. Stephen Hellberg, J. D. Jackson, Verne L. Jacobs, Wayne M. Witzel   +5 more
core   +1 more source

Inversion of exciton level splitting in quantum dots [PDF]

, 2005
The demonstration of degeneracy of exciton spin states is an important step toward the production of entangled photon pairs from the biexciton cascade.
,, ,, Atkinson, P, Cooper, K, Groom, KM, Ritchie, DA, Shields, AJ, Skolnick, MS, Stevenson, RM, Tartakovskii, AI, Young, RJ   +10 more
core   +2 more sources

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

Exciton dynamics in conjugated polymer systems

Frontiers in Physics, 2022
Exciton dynamics in π-conjugated polymers systems encompass multiple time and length scales. Ultrafast femtosecond processes are intrachain and involve a quantum mechanical correlation of the exciton and nuclear degrees of freedom.
William Barford, William Barford
doaj   +1 more source

Modulating Two‐Photon Absorption in a Pyrene‐Based MOF Series: An In‐Depth Investigation of Structure–Property Relationships

Advanced Functional Materials, EarlyView.
This study investigates H4TBAPy‐based metal–organic frameworks (MOFs) ‐ NU‐1000, NU‐901, SrTBAPy, and BaTBAPy ‐ for multiphoton absorption (MPA) performance. It observes topology‐dependent variations in the 2PA cross‐section, with BaTBAPy exhibiting the highest activity.
Simon N. Deger, Helmy Pacheco Hernandez, Yang Cui, Hongxing Hao, Vanessa Ramm, David C. Mayer, Khai‐Nghi Truong, Roland A. Fischer, Jürgen Hauer, Mariana Kozlowska, Alexander Pöthig   +10 more
wiley   +1 more source

Coherent control of indirect excitonic qubits in optically driven quantum dot molecules

, 2010
We propose an optoelectronic scheme to define and manipulate an indirect neutral exciton qubit within a quantum dot molecule. We demonstrate coherent dynamics of indirect excitons resilient against decoherence effects, including direct exciton ...
B. D. Bartolo, B. W. Shore, C. Cohen-Tannoudji, F. Hennebergerer, J. Dexter, Juan E. Rolon, M. A. Nielsen, Sergio E. Ulloa, Y. Yamamoto, Z. M. Wang   +9 more
core   +1 more source