Article
Optics
Jian Xin, Yue Liang, Junhua Gao, Yuxiao Wang, Yinglin Song, Xueru Zhang
Summary: In this study, the time-dependent change in the effective permittivity of an Ag nanorod array in hyperbolic metamaterials (HMMs) is extracted, and the existence of an ultrafast recovery process is experimentally confirmed. The calculation based on the extracted nonlinear effective permittivity indicates that the ultrafast signal originates from the superposition of two slower recovery processes. These results reveal that the superposition of two nonlinear processes with different signs and recovery speeds can lead to faster signal recovery in the combined process.
Article
Chemistry, Multidisciplinary
Yashu Kharbanda, Mateusz Urbanczyk, Vladimir V. Zhivonitko, Sarah Mailhiot, Mikko Kettunen, Ville-Veikko Telkki
Summary: In this study, a method using low-cost, portable, single-sided NMR instruments for analyzing molecular exchange processes is introduced. By exploiting the inherent magnetic field inhomogeneity of the instruments, diffusion contrast of exchange sites and spatial encoding of 2D data can be achieved. The method, called ultrafast diffusion exchange spectroscopy, significantly shortens the experiment time and improves the sensitivity by several orders of magnitude. The feasibility of the method is demonstrated by quantifying intra- and extracellular exchange of water in a yeast cell suspension.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
David Ayuso, Andres F. F. Ordonez, Olga Smirnova
Summary: This article reflects on the electric-dipole revolution in chiral measurements, discussing new methods and techniques for chiral measurements and the manipulation of chiral molecules with light.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Xueke Yu, Yan Su, Wen-wu Xu, Jijun Zhao
Summary: The Au-9(PH3)(8)/MoS2 heterojunction demonstrates excellent light absorption capacity and effective charge separation due to ultrafast electron transfer and slow hole transfer. Nonadiabatic coupling and density overlap are identified as the reasons for faster electron separation relative to hole separation, with electron-hole recombination requiring a longer timespan.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Nora Schopp, Viktor V. Brus, Thuc-Quyen Nguyen
Summary: Organic (semi)transparent photovoltaics offer integrated, sustainable, low-cost energy harvesting solutions, but face efficiency limitations. Simulation-based research explores the impact of selective transparency on photoelectronic processes, revealing changes in generation-recombination dynamics and extraction efficiency linked to increased transparency. The study highlights the importance of active layer quality and suggests that a wider range of transparent electrode materials could benefit ST-OPVs.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
Chantal Daniel
Summary: Coordination compounds have fascinating electronic properties that can easily bind to proteins, polymers, wires and DNA, developing various functions when irradiated that find applications in solar cells, photocatalysis, luminescent and conformational probes, electron transfer triggers, and diagnostic or therapeutic tools. The control of these functions is influenced by light wavelength, metal/ligand cooperation, and environment within the first picoseconds (ps), demonstrating how spin-orbit, vibronic coupling, and quantum effects drive the photophysics of these molecules in the early stage of photoinduced elementary processes within the fs-ps time scale range.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Review
Chemistry, Physical
Martin Centurion, Thomas J. A. Wolf, Jie Yang
Summary: GUED is a technique used to probe the nuclear geometry evolution in photoexcited molecules. It is sensitive to the spatial distribution of charge and can capture coherent nuclear motions with high resolution. Improvements in temporal resolution have made GUED a powerful tool for studying structural dynamics in molecules.
ANNUAL REVIEW OF PHYSICAL CHEMISTRY
(2022)
Article
Physics, Fluids & Plasmas
Miranda D. Louwerse, David A. Sivak
Summary: This paper investigates the correspondence between driving protocols and spontaneous transition mechanisms in a system undergoing metastable configurations. The study shows that even though control parameters cannot fully reproduce the detailed features of spontaneous mechanisms, the general order of spin flips during the transition remains preserved. The external control parameters provide energy to the system components to compensate for changes in internal energy during a minimum-work protocol, highlighting the importance of tuning control parameters to counteract underlying energetic features.
Article
Nanoscience & Nanotechnology
Gordon H. Y. Li, Ryoto Sekine, Rajveer Nehra, Robert M. Gray, Luis Ledezma, Qiushi Guo, Alireza Marandi
Summary: The introduction of energy-efficient hardware accelerators has become necessary in recent years due to the computational demands of deep learning applications. Optical neural networks have shown promise as a potential solution, but their progress has been limited by a lack of energy-efficient nonlinear optical functions. This study demonstrates an all-optical Rectified Linear Unit (ReLU) using a periodically-poled thin-film lithium niobate nanophotonic waveguide, achieving ultra-low energies and near-instantaneous operation. This provides a practical path towards all-optical and energy-efficient nanophotonic deep learning.
Article
Chemistry, Applied
Yanbing Han, Jinchong Xiao, Xingzhi Wu, Yuxiao Wang, Xueru Zhang, Yinglin Song
Summary: A series of twistacenes were designed and synthesized based on theoretical analysis of the natural transition orbitals. These twistacenes showed two photon absorption and unique broadband excited singlet state absorption features, which were confirmed by various experimental methods. One of the screened twistacenes exhibited excellent optical limiting behavior, making it a promising candidate for nonlinear optical applications.
Article
Optics
Ryotatsu Yanagimoto, Edwin Ng, Logan G. Wright, Tatsuhiro Onodera, Hideo Mabuchi
Summary: The study utilizes matrix product state representation to efficiently simulate ultrashort pulses in nonlinear nanophotonic waveguides, enabling research on nonlinear behaviors. Analyzing the quantum states of solitons and multions reveals their entanglement structure and non-classical characteristics.
Article
Chemistry, Physical
Maria Gabriella Chiariello, Greta Donati, Umberto Raucci, Fulvio Perrella, Nadia Rega
Summary: The excited state proton transfer (ESPT) reaction from the photoacid HPTS to an acetate molecule has been investigated through ab initio molecular dynamics simulations, showing that the initial structural configuration and vibrational fingerprints play significant roles in the ESPT kinetics. The proton transfer happens quickly within 1 ps, with the relative orientation of the proton donor-acceptor pair and the presence of a water molecule being key factors in facilitating ESPT. The vibrational signatures of the ESPT reaction, such as the blue shift of the acetate CO stretching and sensitivity of the acetate CC stretching, provide insights into the progress of the reaction.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Computer Science, Artificial Intelligence
Chun Shan, Siyi Zhou, Ziyi Zhang, Mianjie Li
Summary: This study proposes a method of embedding information using image feature points to improve the imperceptibility of generated images. The potential of this method in various practical applications is explored, and experimental verification is conducted using different wavelet bases.
INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS
(2022)
Article
Multidisciplinary Sciences
Palas Roy, Wesley R. Browne, Ben L. Feringa, Stephen R. Meech
Summary: Controlling molecular translation at the nanoscale is a key objective for development of synthetic molecular machines. Recently developed third generation photochemically driven molecular motors (3GMs) offer the possibility of converting light energy into translational motion. Detailed understanding of their excited state dynamics facilitates the development of 3GMs.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Mriganka Singh, I-Hung Ho, Anupriya Singh, Ching-Wen Chan, Jing-Wei Yang, Tzung-Fang Guo, Hyeyoung Ahn, Vincent Tung, Chih Wei Chu, Yu-Jung Lu
Summary: The development of multidimensional heterostructure lead halide perovskites has shown promise in enhancing the efficiency and stability of perovskite solar cells. In this study, the ultrafast carrier extraction in highly efficient 2D/3D bilayer perovskite solar cells was observed, shedding light on the advanced working mechanism of these solar cells.
Article
Chemistry, Physical
Clemens Vittmann, R. Kevin Kessing, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: This study investigates the nonequilibrium dynamics of electron transmission from a straight waveguide to a helix with spin-orbit coupling. Transmission is found to be spin-selective, leading to large spin polarizations of the itinerant electrons. The degree of spin selectivity depends on the width of the interface region, and no polarization is observed for single-point couplings. The study identifies interface structure and conservation of momentum as crucial factors for chiral-induced spin selectivity, and confirms the robustness of this mechanism against static disorder.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Mathematical
Giovanni Ferrari, Ludovico Lami, Thomas Theurer, Martin B. Plenio
Summary: In this study, we examine asymptotic state transformations in continuous variable quantum resource theories. We prove that lower semicontinuity and strong superadditivity can be used to bound asymptotic transformation rates in these settings. We provide applications to optical nonclassicality, entanglement, and quantum thermodynamics resource theories. Our findings offer computable upper bounds for asymptotic transformation rates, including those achievable with linear optical elements.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2023)
Article
Chemistry, Physical
Clemens Vittmann, James Lim, Dario Tamascelli, Susana F. Huelga, Martin B. Plenio
Summary: This study examines the role of delocalized phonon modes in electron transport in chiral structures and demonstrates that spin selectivity can originate from spin-dependent energy and momentum conservation in electron-phonon scattering events. The degree of spin polarization, however, depends on environmental factors and the presence of external driving fields. The parametric dependence allows for experimentally testable predictions of the model.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Mathematics, Applied
Andrea Smirne, Dario Tamascelli, James Lim, Martin B. Plenio, Susana F. Huelga
Summary: In this study, we determine the conditions for the equivalence between the multi-time expectation values of a general finite-dimensional open quantum system when interacting with different environments. This non-perturbative evaluation of multi-time expectation values allows for the investigation of open-system multi-time quantities in fully general regimes.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2022)
Article
Quantum Science & Technology
C. Munuera-Javaloy, R. Puebla, B. D'Anjou, M. B. Plenio, J. Casanova
Summary: This article presents a new method for detecting molecular conformational changes using nitroxide electron-spin labels and a nitrogen-vacancy center in diamond. By applying microwave and radiofrequency pulses carefully, stable nitroxide resonances can be achieved. The article also proposes an optimized scheme by using nitroxides with distinct nitrogen isotopes. Additionally, a simple theoretical model is developed and combined with Bayesian inference techniques to demonstrate the ability to detect conformational changes in ambient conditions and extract inter-label distances using the residual effect of random molecular tumbling.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Patrick Barthel, Patrick H. Huber, Jorge Casanova, Inigo Arrazola, Dorna Niroomand, Theeraphot Sriarunothai, Martin B. Plenio, Christof Wunderlich
Summary: We demonstrate the experimental implementation of a two-qubit phase gate using a radio frequency controlled trapped-ion quantum processor. The gate is generated by applying a pulsed dynamical decoupling sequence to the ions' carrier transitions, allowing for tunable and high-fidelity phase shift. The gate's performance is robust against various sources of error and holds potential for fast gate speeds.
NEW JOURNAL OF PHYSICS
(2023)
Article
Mathematics
Juan Francisco Sanchez-Perez, Gonzalo Garcia-Ros, Manuel Conesa, Enrique Castro, Manuel Canovas
Summary: This paper presents a concise and orderly methodology for obtaining universal solutions to various problems in science and engineering by nondimensionalizing the governing equations. A deep understanding of the problem is required for its application, in order to choose the appropriate references for resolution. The methodology is demonstrated through examples of coupled differential equations, providing an interesting tool for postgraduate education in physics, mathematics, and engineering.
Article
Physics, Multidisciplinary
Alejandro D. Somoza, Nicola Lorenzoni, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: The role of vibrational motion in the charge dynamics of donor-acceptor networks in organic photovoltaics is investigated using non-perturbative simulations. The study addresses the challenge of simulating large electronic-vibrational systems and identifies conditions under which underdamped vibrational motion induces efficient charge separation. The results provide insights into coupling mechanisms and the role of entropic effects, offering a toolbox for designing efficient charge separation pathways in artificial nanostructures.
COMMUNICATIONS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Juan Francisco Sanchez-Perez, Fulgencio Marin-Garcia, Enrique Castro, Gonzalo Garcia-Ros, Manuel Conesa, Joaquin Solano-Ramirez
Summary: This study proposes a general methodology to solve the Burgers-Huxley equation or coupled systems formed by it, and explains the implementation of common boundary conditions in different engineering problems. The method is based on establishing an analogy between the variables of the differential equations and electrical voltage.
Article
Mathematics
Gonzalo Garcia-Ros, Danny Xavier Villalva-Leon, Enrique Castro, Juan Francisco Sanchez-Perez, Julio Valenzuela, Manuel Conesa
Summary: This research conducted compression tests on sand samples with different moisture contents under oedometric conditions. Acoustic emission sensors were used to monitor the acoustic signals generated inside the sample. Correlation and regression analysis were performed to quantify the relationships between geotechnical variables and acoustic emission parameters. The results demonstrate the potential of using acoustic variables to determine geotechnical properties, providing a complementary tool for determining mechanical properties of compressed soils.
Article
Mathematics
Manuel Conesa, Juan Francisco Sanchez-Perez, Gonzalo Garcia-Ros, Enrique Castro, Julio Valenzuela
Summary: The normalization technique is a simple mathematical approach that can be used to solve physical problems involving differential equations. By choosing appropriate references, independent dimensionless monomials can be obtained, which in turn affect the solution of the problem. The advantages of this technique include its simplicity, avoidance of complex calculations, and applicability to nonlinear problems. However, selecting appropriate references in complex scenarios can be challenging.
Article
Physics, Multidisciplinary
Alastair Marshall, Thomas Reisser, Phila Rembold, Christoph Mueller, Jochen Scheuer, Martin Gierse, Tim Eichhorn, Jakob M. Steiner, Patrick Hautle, Tommaso Calarco, Fedor Jelezko, Martin B. Plenio, Simone Montangero, Ilai Schwartz, Matthias M. Mueller, Philipp Neumann
Summary: This paper utilizes photoexcited triplet state of pentacene-doped naphthalene crystals to polarize surrounding protons and enhance nuclear magnetic resonance signals. Optimal control pulses designed with REDCRAB and a strategy called ARISE are introduced to improve the performance of hyperpolarization sequences.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Julen S. Pedernales, Martin B. Plenio
Summary: This study designs a method that utilizes spatial correlations to reduce the impact of perturbations from distant sources on the visibility of matter-wave interference patterns, and develops a general framework for correcting the multipole expansion of environmental potential fields. This method works for stochastic field fluctuations at any timescale and does not require quantum correlations.
Article
Quantum Science & Technology
Theodoros Ilias, Dayou Yang, Susana F. Huelga, Martin B. Plenio
Summary: This study proposes a protocol for criticality-enhanced sensing by continuously observing the emitted radiation quanta. The study establishes a scaling theory for the global quantum Fisher information and derives universal scaling laws related to critical exponents. The findings suggest that the precision scaling of continuous detection of emitted quanta exceeds that of direct measurement, indicating the metrological value of this approach in dissipative criticality.
Article
Optics
Giovanni Spaventa, Susana F. Huelga, Martin B. Plenio
Summary: This study combines the concepts of quantum resource theory and divisibility classes of quantum channels to prove that memory effects can increase the efficiency of photoisomerization, which is not achievable under purely thermal Markovian evolution. This provides rigorous evidence that memory effects can serve as a resource in quantum thermodynamics at the nanoscale.
