Article
Materials Science, Multidisciplinary
O. Ruiz-Cigarrillo, L. F. Lastras-Martinez, E. A. Cerda-Mendez, G. Flores-Rangel, C. A. Bravo-Velazquez, R. E. Balderas-Navarro, A. Lastras-Martinez, N. A. Ulloa-Castillo, K. Biermann, P. Santos
Summary: This study investigated in-plane optical anisotropies in symmetric and asymmetric double quantum wells using reflectance anisotropy spectroscopy. It was found that a reduction in symmetry from D-2d to C-2v leads to an increase in reflectance anisotropy strength due to heavy- and light-hole mixing. Residual anisotropies in symmetric DQWs originate from QW interface asymmetry, while in asymmetric DQWs, the asymmetrical distribution of AlGaAs layers contributes to the increased RAS intensity.
Article
Chemistry, Physical
Finn L. Sebastian, Nicolas F. Zorn, Simon Settele, Sebastian Lindenthal, Felix J. Berger, Christoph Bendel, Han Li, Benjamin S. Flavel, Jana Zaumseil
Summary: Researchers have proposed a direct quantification protocol based on a linear correlation that can accurately assess the defect density on the lattice of single-wall carbon nanotubes (SWCNTs) and determine the oscillator strengths of different defect types.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Rui Zhou, Laizhi Sui, Xinbao Liu, Kaikai Liu, Dengyang Guo, Wenbo Zhao, Shiyu Song, Chaofan Lv, Shu Chen, Tianci Jiang, Zhe Cheng, Sheng Meng, Chongxin Shan
Summary: The study investigates self-trapped exciton emission in ZnO nanoparticles and demonstrates their application in optical imaging. The research finds that ZnO nanoparticles exhibit multiphoton excited singlet/triplet mixed self-trapped exciton emission, which is of great significance in optical detection and biological photonics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Janusz Andrzejewski, Mieczyslaw Antoni Pietrzyk, Dawid Jarosz, Adrian Kozanecki
Summary: This paper investigates the photoluminescence spectra of excitons in ZnO/ZnMgO/ZnO double asymmetric quantum wells. The presence of an internal electric-field band structure lowers the energy of quantum states and allows for the spatial separation of electrons and holes in wide quantum wells, forming indirect excitons. The study uses single particle states in the wurtzite structure and a self-consistent model to calculate excitons with 2D hydrogenic 1s-like wave functions.
Article
Engineering, Electrical & Electronic
Seref Kalem
Summary: Black silicon (b-Si) with its promising optical, electronic and structural properties has attracted great attention for a wide range of applications. In this study, a technique involving thermal oxidation, photoresist coating, and chlorine plasma etching was used to produce b-Si and investigate its radiative recombination dynamics. The results showed the presence of a no-phonon radiative recombination component competing with non-radiative recombination at surface defects. The emission exhibited two decay processes with a peak energy at around 480 nm, a fast component of about 15 ps, and a lifetime component of around 50 ps, as well as a slow process in the red spectral region with a time constant of 1500 ps.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Xilong Liang, Chengbing Qin, Yan Gao, Shuangping Han, Guofeng Zhang, Ruiyun Chen, Jianyong Hu, Liantuan Xiao, Suotang Jia
Summary: The study found that the spin-orbit coupling of monolayer MoS2 can be reversibly engineered by laser irradiation under controlled gas environments, where the spin-orbit splitting has been effectively regulated within 140 meV to 200 meV, and the photoluminescence intensity of the B exciton can be reversibly manipulated over 2 orders of magnitude.
Article
Materials Science, Multidisciplinary
K. Abiedh, Z. Zaaboub, F. Hassen
Summary: The newly emerged all inorganic perovskite CsPbBr3 has unique optical properties and is promising for optoelectronic devices. By studying the recombination mechanism using power-dependent time-resolved photoluminescence measurements, it was found that the photoluminescence in CsPbBr3 comes from the recombination of free carriers and localized trap states, with faster decay at higher excitation power densities.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Optics
I. D. Laktaev, B. M. Saidzhonov, R. B. Vasiliev, A. M. Smirnov, O. V. Butov
Summary: The photoluminescence features of a light-hole - electron exciton transition in CdSe/CdS nanoplatelets colloidal solution under resonant two-photon excitation were investigated. The powerlaw dependence of the photoluminescence intensity on the excitation laser femtosecond pulses intensity was discovered to be related to biexciton radiation. In addition, the conditions for the photoluminescence growth and quenching were determined based on the concentration and pump intensity.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nanoscience & Nanotechnology
Daria Khmelevskaia, Daria Markina, Pavel Tonkaev, Mikhail Masharin, Aleksey Peltek, Pavel Talianov, Mikhail A. Baranov, Anna Nikolaeva, Mikhail Valeryevich Zyuzin, Lev Evgenevich Zelenkov, Anatoly P. Pushkarev, Andrey L. Rogach, Sergey V. Makarov
Summary: This study investigates the influence of the order of nonlinearity in halide perovskites on the performance of light conversion processes. The results reveal a strong dependence of the nonlinearity order on temperature, excitation wavelength, thickness, and size.
Article
Chemistry, Multidisciplinary
Felix Plasser, Anna Krylov, Andreas Dreuw
Summary: libwfa is an open-source software library for wavefunction analysis, offering a variety of analysis methods for post-processing excited-state calculations. These tools provide graphical representations of various excited-state processes and offer insights into electronic structure. The software is capable of automated processing of large data sets and establishes a link between many-body wavefunctions and physical and chemical models.
WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Jianan Lv, Xinyue Lu, Xin Li, Minxuan Xu, Jiasong Zhong, Xin Zheng, Yueqin Shi, Xuefeng Zhang, Qi Zhang
Summary: The all-inorganic lead-free Cu-based halide perovskites have attracted extensive interest recently due to their impressive photophysical characteristics. In this study, 2D all-inorganic perovskite Cs3Cu2I5 single crystals were successfully grown on mica substrates, and UV photodetectors based on individual Cs3Cu2I5 nanosheets were fabricated, showing high responsivity and fast response speed, outperforming other 2D metal halide perovskite UV sensors. This work sheds light on the fabrication of green optoelectronic devices based on lead-free 2D perovskites, important for the sustainable development of photoelectric technology.
Article
Materials Science, Multidisciplinary
Aurelia Chenu, Shiue-Yuan Shiau, Ching-Hang Chien, Monique Combescot
Summary: In this study, we investigate the strong coupling between photons and excitonic excitations in a coupled quantum well under the presence of an electric field. We demonstrate the transition from a hybrid polariton, composed of a photon coupled to hybrid carriers in two wells, to a dipolariton, composed of a photon coupled to direct and indirect excitons, with an increase in the field strength. We also explore how the cavity photon lifetime and the coherence time of the carrier wave vectors affect these polaritonic states through non-hermitian Hamiltonians. While the hybrid polaritons exhibit a spectral singularity known as an exceptional point, depending on detuning and lifetimes, we find that the three dipolaritonic states display an anticrossing without an exceptional point due to the interaction among photons, direct, and indirect excitons.
Article
Chemistry, Multidisciplinary
Milian Kaiser, Yang Li, Isabel Allegro, Bryce S. Richards, Ulrich Wilhelm Paetzold, Ian A. Howard
Summary: Optical excitation of quasi-2D perovskites leads to excited-state populations of excitons, free charge carriers, or a mixture of both, depending on the type and amount of 2D spacer used. The study reveals the varying proportions of excited state populations and their dynamics in thin films, which have implications for device engineering.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Duy-Nhat Ly, Dai-Nam Le, Ngoc-Hung Phan, Van-Hoang Le
Summary: In this study, a new mechanism is proposed, in which the thermal motion of exciton's center of mass affects the magnetoexciton energies in monolayer dichalcogenides. By separating the center of mass motion from an exciton in a magnetic field, an equation for relative motion is obtained, showing thermal-magnetic shifts in exciton energies and new peaks in the absorption spectra. This mechanism could be extended for other magnetoquasiparticles.
Article
Chemistry, Applied
Yu P. Piryatinski, A. B. Verbitsky, A. Dmytruk, M. B. Malynovskyi, P. M. Lutsyk, A. G. Rozhin, O. D. Kachkovsky, Ya O. Prostota, V. V. Kurdyukov
Summary: This study investigated the nature and pathways of electronic excitation relaxation in a cationic pentamethine pyrylocyanine dye at low temperature. Through quantum-chemical calculations and time-resolved spectral measurements, the symmetric and non-symmetric structures in the ground and excited states were characterized, along with proposed energy diagram model for relaxation pathways. The study found that the transition between polymethine and polyene structures significantly impacts the electronic properties of the dye.
Article
Physics, Condensed Matter
E. L. Ivchenko, V. K. Kalevich, A. Kunold, A. Balocchi, X. Marie, T. Amand
Article
Chemistry, Physical
M. A. G. Balanta, P. B. A. de Oliveira, H. Albalawi, Y. Galvao Gobato, H. V. A. Galeti, A. D. Rodrigues, M. Henini, S. Almosni, C. Robert, A. Balocchi, Y. Leger, H. Carrere, M. Bahri, G. Patriarche, X. Marie, C. Cornet
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
Nadine Leisgang, Shivangi Shree, Ioannis Paradisanos, Lukas Sponfeldner, Cedric Robert, Delphine Lagarde, Andrea Balocchi, Kenji Watanabe, Takashi Taniguchi, Xavier Marie, Richard J. Warburton, Iann C. Gerber, Bernhard Urbaszek
NATURE NANOTECHNOLOGY
(2020)
Article
Physics, Applied
Eric Vetter, Melike Biliroglu, Dovletgeldi Seyitliyev, Pramod Reddy, Ronny Kirste, Zlatko Sitar, Ramon Collazo, Kenan Gundogdu, Dali Sun
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Physical
Juliana Barros Barbosa, Pierre Louis Taberna, Valerie Bourdon, Iann C. Gerber, Romuald Poteau, Andrea Balocchi, Xavier Marie, Jerome Esvan, Pascal Puech, Antoine Barnabe, Lucianna Da Gama Fernandes Vieira, Ionut-Tudor Moraru, Jean Yves Chane-Ching
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Article
Physics, Applied
Elisa Vitiello, Simone Rossi, Christopher A. Broderick, Giorgio Gravina, Andrea Balocchi, Xavier Marie, Eoin P. O'Reilly, Maksym Myronov, Fabio Pezzoli
PHYSICAL REVIEW APPLIED
(2020)
Article
Materials Science, Multidisciplinary
F. Cadiz, D. Lagarde, B. Tao, J. Frougier, B. Xu, X. Devaux, S. Migot, Z. G. Wang, X. F. Han, J-M George, H. Carrere, A. Balocchi, T. Amand, X. Marie, B. Urbaszek, H. Jaffres, Y. Lu, P. Renucci
PHYSICAL REVIEW MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Rajagopal Shyamala Joshya, Helene Carrere, Victor Guadalupe Ibarra-Sierra, Juan Carlos Sandoval-Santana, Vladimir K. Kalevich, Eugeniyus L. Ivchenko, Xavier Marie, Thierry Amand, Alejandro Kunold, Andrea Balocchi
Summary: By introducing a new method, conventional dilute nitride GaAs-based semiconductor epilayers have been given a chiral photoconductivity for the detection of light helicity. The light polarization state and intensity can be determined by a simple conductivity measurement, as the conduction electron spin polarization is linked to the excitation light polarization. This approach eliminates the need for optical elements in front of a non-chiral detector, allowing for easier integration and miniaturization.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
V. G. Ibarra-Sierra, J. C. Sandoval-Santana, R. S. Joshya, H. Carrere, L. A. Bakaleinikov, V. K. Kalevich, E. L. Ivchenko, X. Marie, T. Amand, A. Balocchi, A. Kunold
Summary: The optoelectronic compact circular polarimeter proposed in this study utilizes GaAs1-xNx as the base material and measures circular polarization degree and light intensity through spin-dependent capture and hyperfine interaction. Without bulky movable parts, it is easy to integrate and distinguish the handedness of incident light.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
A. Aguirre-Perez, R. S. Joshya, H. Carrere, X. Marie, T. Amand, A. Balocchi, A. Kunold
Summary: We demonstrate the application of a two stage machine learning algorithm to correlate the electrical signals from a GaAsxN1-x circular polarimeter with the properties of an incident light beam. The algorithm accurately predicts the intensity, degree of circular polarization (DCP), and handedness of the light beam, and can be easily adjusted to other device configurations.
Article
Physics, Multidisciplinary
Lukas Sponfeldner, Nadine Leisgang, Shivangi Shree, Ioannis Paradisanos, Kenji Watanabe, Takashi Taniguchi, Cedric Robert, Delphine Lagarde, Andrea Balocchi, Xavier Marie, Iann C. Gerber, Bernhard Urbaszek, Richard J. Warburton
Summary: The coupling of intralayer A and B excitons and interlayer excitons (IE) in a two-dimensional semiconductor, homobilayer MoS2, is studied. The optical susceptibility measurements reveal both the magnitude and phase of the coupling constants. The coupling mechanisms between IE-B and IE-A are interpreted as hole tunneling and electron-hole exchange, respectively. It is also found that even in a monolayer, the A and B excitons have mixed spin states. Moreover, a bright and highly tunable lowest-energy momentum-direct exciton is achieved under high electric fields.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
D. Beret, L. Ren, C. Robert, L. Foussat, P. Renucci, D. Lagarde, A. Balocchi, T. Amand, B. Urbaszek, K. Watanabe, T. Taniguchi, X. Marie, L. Lombez
Summary: We investigated the diffusion process of negatively charged excitons in a WSe2 monolayer and found nonlinear diffusion behavior. The dynamics of different excitonic species were examined, and a bimolecular formation mechanism was proposed. Based on our experimental observations, a phenomenological model suggesting the coexistence of two populations, with different diffusion mechanisms, was proposed.
Article
Materials Science, Multidisciplinary
J. C. Sandoval-Santana, V. G. Ibarra-Sierra, H. Carrere, M. M. Afanasiev, L. A. Bakaleinikov, V. K. Kalevich, E. L. Ivchenko, X. Marie, T. Amand, A. Balocchi, A. Kunold
Article
Materials Science, Multidisciplinary
Minju Ying, Ahmad M. A. Saeedi, Miaomiao Yuan, Xia Zhang, Bin Liao, Xu Zhang, Zengxia Mei, Xiaolong Du, Steve M. Heald, A. Mark Fox, Gillian A. Gehring
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
Article
Materials Science, Multidisciplinary
Iann C. Gerber, Emmanuel Courtade, Shivangi Shree, Cedric Robert, Takashi Taniguchi, Kenji Watanabe, Andrea Balocchi, Pierre Renucci, Delphine Lagarde, Xavier Marie, Bernhard Urbaszek
