Article
Materials Science, Multidisciplinary
Benjamin Griffiths, Andrew Kirkpatrick, Shannon S. Nicley, Rajesh L. Patel, Joanna M. Zajac, Gavin W. Morley, Martin J. Booth, Patrick S. Salter, Jason M. Smith
Summary: The engineering of single atomic defects into wide-band-gap materials has become an attractive field in recent years, driven by emerging applications such as solid-state quantum bits and sensors. This study investigates the ultrafast laser generation of vacancy-interstitial pairs in diamond, proposing a new model for the formation mechanism of Frenkel defects and providing insights into the non-equilibrium dynamics of charge carriers during and after the laser pulse interaction.
Article
Physics, Multidisciplinary
Jing Liu, Chun Li, Wei Jin, Georgios Lefkidis, Wolfgang Huebner
Summary: By using high-level ab initio quantum theory, a subpicosecond spin transfer scenario induced by light is proposed, allowing spin density transfer at the nanoscale. The combination of local and global symmetries plays a key role in enabling long-range coupling of spins.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Dario Cilluffo, Giuseppe Buonaiuto, Igor Lesanovsky, Angelo Carollo, Salvatore Lorenzo, G. Massimo Palma, Francesco Ciccarello, Federico Carollo
Summary: A microscopic theory is developed to bias the quantum trajectories of an open quantum system, making rare trajectories typical. By considering discrete-time quantum dynamics and modifying Kraus operators, the desired biasing is achieved, effectively enforcing the system to follow a desired rare trajectory through extra collisions. This extends the theory of biased quantum trajectories to arbitrary dynamical maps, providing a transparent physical interpretation.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Surya Narayan Panda, Sucheta Mondal, Sudip Majumder, Anjan Barman
Summary: In this study, the effects of femtosecond laser pulses on the magnetization dynamics in Ni80Fe20 thin films were investigated using time-resolved magneto-optical Kerr effect magnetometry. The experimental results show significant changes in the magnetization dynamics, including variations in demagnetization time, remagnetization time, enhancement of the Gilbert damping parameter, and a redshift in the precessional frequency, with increasing excitation energy. It was experimentally verified that spin-flip scattering and intraband electron conductivity contribute to the ultrafast demagnetization and damping processes.
Article
Quantum Science & Technology
Surya Narayan Panda, Bivas Rana, YoshiChika Otani, Anjan Barman
Summary: This study investigates magnetization dynamics in different NM/Co20Fe60B20 heterostructures using femtosecond pulsed laser-induced time-resolved magneto-optical Kerr effect magnetometry. It is found that the SOC strength of the underlayer has a systematic influence on ultrafast demagnetization time, fast remagnetization time, and the Gilbert damping parameter. The spin pumping formalism estimates that higher SOC strength results in more efficient transport of spin current.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Physics, Fluids & Plasmas
Srijan Bhattacharyya, Arnab Ghosh, Deb Shankar Ray
Summary: In this study, we explored the microscopic quantum generalization of classical Lienard systems using a system-reservoir model and nonlinear coupling. The derived quantum Langevin equation showed that detailed balance in the form of the fluctuation-dissipation relation preserves the dynamical stability of the attractors, even with vacuum excitation. The quantum versions of Rayleigh, van der Pol, and other Lienard oscillators were derived as special cases within a mean-field description in our theoretical scheme.
Article
Geochemistry & Geophysics
Daniel Pastor-Galan, Oscar Groenhof, Emilio L. Pueyo, Esther Izquierdo-Llavall, Jaume Dinares-Turell, Mark J. Dekkers
Summary: Palaeomagnetism is a versatile tool used in geological timescales and plate tectonic reconstructions, although it faces complications such as remagnetizations in rocks. The study evaluated the magnetization history of Silurian-Devonian carbonates in the Pyrenees, showing that most samples likely acquired their magnetization during the late Carboniferous and early Permian times.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Chemistry, Physical
Michele Failla, Fransisco Garcia Florez, Bastiaan B. V. Salzmann, Daniel Vanmaekelbergh, Henk T. C. Stoof, Laurens D. A. Siebbeles
Summary: We studied the initial nature and relaxation of photoexcited electronic states in CdSe nanoplatelets (NPLs) using ultrafast transient optical absorption measurements and theoretical analysis. The quantum yields of heavy-hole (HH) excitons, light-hole (LH) excitons, and charge carriers vary strongly with photon energy, while thermal relaxation occurs within 1 ps. We observed no signs of biexcitons or larger complexes, except when a probe-generated exciton interacted with a previously produced exciton.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Michele Failla, Fransisco Garcia Florez, Bastiaan B. V. Salzmann, Daniel Vanmaekelbergh, Henk T. C. Stoof, Laurens D. A. Siebbeles
Summary: In this study, the initial nature and relaxation of photoexcited electronic states in CdSe nanoplatelets were investigated using ultrafast transient optical absorption measurements and theoretical analysis. It was found that the initial quantum yields of excitons and charge carriers vary with photon energy, and thermal relaxation occurs within 1 ps. No signatures of biexcitons or larger complexes were observed up to the highest average number of absorbed photons per NPL in the experiments.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Civil
Freddy Antony Mullakkal-Babu, Meng Wang, Bart van Arem, Barys Shyrokau, Riender Happee
Summary: This work integrates lateral vehicle dynamics and yaw motion into a traffic simulation framework to describe lateral motion and vehicle interactions more precisely. The framework consists of two coupled layers, an upper tactical level for maneuver planning and a lower operational layer with a control module that operates in a closed loop with the vehicle dynamics model. The framework allows for dynamic trajectory re-planning and models lateral maneuvers such as curve negotiation and lane changes.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2021)
Article
Physics, Multidisciplinary
Benjamin Guiselin, Camille Scalliet, Ludovic Berthier
Summary: Research indicates that the dynamic relaxation spectra of supercooled liquids become asymmetric near the glass transition temperature, with the emergence of a power-law wing at high frequencies. By studying model supercooled liquids near this temperature, a new computational approach reveals that this asymmetry is due to relaxation at rare, localized regions over broadly distributed timescales, associating heterogeneous activated dynamics with dynamic facilitation. This work sheds light on the molecular motion responsible for glass formation under relevant experimental conditions.
Article
Physics, Fluids & Plasmas
Boris S. Kerner, Sergey L. Klenov
Summary: By using microscopic traffic simulations, physical features of microscopic traffic prediction for automated driving that improve traffic harmonization and safety have been discovered. The impact of data uncertainty on prediction reliability has been studied, and optimal automated vehicle control has been identified.
Article
Chemistry, Multidisciplinary
Jiangong Cheng, Yang Ma, Wencai Zhou, Tong Zhang, Wenling Li, Xiaobo Zhang, Hui Yan, Jinpeng Li, Zilong Zheng, Xiaoqing Chen, Yongzhe Zhang
Summary: Novel metal halide perovskite shows promise as an optoelectronic material, but fabricating microscopic devices is difficult due to solubility issues with the photoresist. A new doping method is proposed, where the intrinsic ion defects are redistributed to modulate the Fermi level of perovskite, resulting in stable and self-powered microscale photodiodes. This work provides a potential route for fabricating integrated perovskite optoelectronic chips.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
R. Krause, S. Aeschlimann, M. Chavez-Cervantes, R. Perea-Causin, S. Brem, E. Malic, S. Forti, F. Fabbri, C. Coletti, I Gierz
Summary: This study reveals the relevant microscopic charge transfer channels in epitaxial WS2/graphene heterostructures using photoemission spectroscopy and many-particle theory, identifying the mechanisms leading to efficient ultrafast charge separation and determining the lifetime of the charge separated transient state. The subtle interplay of intrinsic and defect-related charge transfer channels could be utilized for the design of highly efficient light harvesting and detecting devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Ding Xu, Arkajit Mandal, James M. Baxter, Shan-Wen Cheng, Inki Lee, Haowen Su, Song Liu, David R. Reichman, Milan Delor
Summary: Semiconductor excitations can form exciton-polaritons with light-like energy flow and matter-like interactions. By using nonlinear momentum-resolved optical approach, the authors directly image the exciton-polaritons in real space on femtosecond scales. It is found that exciton-phonon interactions result in a renormalization of exciton-polariton velocities, but ballistic transport can be maintained for half-exciton polaritons. Upon increasing the excitonic character, rapid decoherence leads to diffusive transport.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
Debora Carvalho de Melo Rodrigues, Manuel Pereiro, Anders Bergman, Olle Eriksson, Angela Burlamaqui Klautau
JOURNAL OF PHYSICS-CONDENSED MATTER
(2017)
Article
Chemistry, Physical
Karim Elgammal, Hakan W. Hugosson, Anderson D. Smith, Mikael Rasander, Lars Bergqvist, Anna Delin
Article
Chemistry, Multidisciplinary
Anderson D. Smith, Karim Elgammal, Xuge Fan, Max C. Lemme, Anna Delin, Mikael Rasander, Lars Bergqvist, Stephan Schroder, Andreas C. Fischer, Frank Niklaus, Mikael Ostling
Article
Multidisciplinary Sciences
Pavel F. Bessarab, Gideon P. Mueller, Igor S. Lobanov, Filipp N. Rybakov, Nikolai S. Kiselev, Hannes Jonsson, Valery M. Uzdin, Stefan Blugel, Lars Bergqvist, Anna Delin
SCIENTIFIC REPORTS
(2018)
Article
Materials Science, Multidisciplinary
Lars Bergqvist, Anders Bergman
PHYSICAL REVIEW MATERIALS
(2018)
Article
Physics, Condensed Matter
Konstantinos Koumpouras, Dmitry Yudin, Christoph Adelmann, Anders Bergman, Olle Eriksson, Manuel Pereiro
JOURNAL OF PHYSICS-CONDENSED MATTER
(2018)
Article
Physics, Multidisciplinary
Irina Stockem, Anders Bergman, Albert Glensk, Tilmann Hickel, Fritz Koermann, Blazej Grabowski, Joerg Neugebauer, Bjoern Alling
PHYSICAL REVIEW LETTERS
(2018)
Article
Multidisciplinary Sciences
Raquel Lizarraga, Fan Pan, Lars Bergqvist, Erik Holmstrom, Zsolt Gercsi, Levente Vitos
SCIENTIFIC REPORTS
(2017)
Article
Materials Science, Multidisciplinary
Ravi Yadav, Manuel Pereiro, Nikolay A. Bogdanov, Satoshi Nishimoto, Anders Bergman, Olle Eriksson, Jeroen van den Brink, Liviu Hozoi
PHYSICAL REVIEW MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
Johan Hellsvik, Danny Thonig, Klas Modin, Diana Iusan, Anders Bergman, Olle Eriksson, Lars Bergqvist, Anna Delin
Article
Materials Science, Multidisciplinary
Rohollah Khoshlahni, Alireza Qaiumzadeh, Anders Bergman, Arne Brataas
Article
Materials Science, Multidisciplinary
Ankit Kumar, Fan Pan, Sajid Husain, Serkan Akansel, Rimantas Brucas, Lars Bergqvist, Sujeet Chaudhary, Peter Svedlindh
Article
Materials Science, Multidisciplinary
A. Szilva, D. Thonig, P. F. Bessarab, Y. O. Kvashnin, D. C. M. Rodrigues, R. Cardias, M. Pereiro, L. Nordstrom, A. Bergman, A. B. Klautau, O. Eriksson
Article
Materials Science, Multidisciplinary
Fan Pan, Jonathan Chico, Anna Delin, Anders Bergman, Lars Bergqvist