检索结果-内蒙古大学图书馆

Charge generation mediated by bound polaron pairs and delocalized charge transfer states in non-fullerene organic solar cells 22

学校读者我要写书评

暂无评论

Charge generation mediated by bound polaron pairs and deloca...

22nd International Conference on Ultrafast Phenomena, UP 2020

作者： Song, Yin Liu, Xiao Li, Yongxi Nguyen, Hoang Huy Duan, Rong Kubarych, Kevin J. Forrest, Stephen R. Ogilvie, Jennifer P. Department of Physics University of Michigan Ann ArborMI48109 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Material Science and Engineering University of Michigan Ann ArborMI48109 United States Department of Chemistry University of Michigan Ann ArborMI United States

Using two-dimensional electronic and electronic-vibrational spectroscopies, we find that charge generation via both electron and hole transfer pathways are mediated by bound polaron pairs and delocalized charge-transf... 详细信息

ISBN: (纸本)9781557528209

关键词： Fullerenes

Measurements of the nonlinear optical response of semiconductors with intense 10µm laser pulses

学校读者我要写书评

暂无评论

Measurements of the nonlinear optical response of semiconduc...

Frontiers in Optics, FIO 2019 - Part of Frontiers in Optics + Laser science APS/DLS

作者： Matteo, Daniel Pigeon, Jeremy Tochitsky, Sergei Huttner, Ulrich Kira, Mackillo Koch, Stephan W. Moloney, Jerome V. Joshi, Chan Department of Electrical Engineering University of California Los AngelesCA90095 United States Department of Physics and Material Sciences Center Philipps-Universität Marburg Marburg35032 Germany Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States College of Optical Sciences University of Arizona TucsonAZ85721 United States

We measure four-wave mixing efficiency and nonlinear absorption in GaAs, Ge, and ZnSe using a GW/cm2 CO2 laser. At high fields the nonlinear optical response can be enhanced almost 100x by decreasing the beat frequenc... 详细信息

ISBN: (纸本)9781943580675

关键词： Zinc Selenide

Turnkey deterministic soliton crystal generation

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Yang, Xinyu Zhu, Xiaotian Murray, Caitlin Paryoonyong, Chawaphon Xu, Xingyuan Tan, Mengxi Morandotti, Roberto Little, Brent E. Moss, David J. Chu, Sai T. Corcoran, Bill Su, Donglin School of Electronic and Information Engineering Beihang University Beijing100191 China Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Department of Electrical and Computer System Engineering Monash University ClaytonVIC3168 Australia ARC Centre of Excellence in Optical Microcombs for Breakthrough Science Australia State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada QXP Technologies Inc. Xi’an China Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia

The deterministic generation of robust soliton comb has significant meaning for the optical frequency combs to be widely used in various applications. As a novel form of microcomb, Soliton crystal holds the advantages of easy generation, high conversion efficiency, and excellent thermal robustness. Here, we report the turnkey deterministic generation of ‘Palm-like’ soliton crystal with a free-running scheme. The robustness of the turnkey soliton crystal generation is also investigated in multiple aspects, including the success rate, the thermal robustness, and the long-term stability. The experiment results reveal our turnkey soliton crystal can achieve nearly a 100% success rate with a power variation less than ±1.5 dB over one hundred trials of two samples, is insensitive to thermal effect, and is robust to the environment during four-hour laboratory time. Copyright © 2024, The Authors. All rights reserved.

关键词：

Long-range transport of 2D excitons in dynamic acoustic lattice

学校读者我要写书评

暂无评论

Research Square

Research Square 2021年

作者： Peng, Ruoming Ripin, Adina Ye, Yusen Zhu, Jiayi Wu, Changming Lee, Seokhyeong Li, Huan Taniguchi, Takashi Watanabe, Kenji Cao, Ting Xu, Xiaodong Li, Mo Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Physics University of Washington SeattleWA98195 United States Department of Material Science and Engineering University of Washington SeattleWA98195 United States Research Center for Functional Materials National Institute for Materials Science Tsukuba Japan

Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to a weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the dynamic potential lattice induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches a distance at least ten times longer than the diffusion length, only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to an acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers. © 2021, CC BY.

关键词： Excitons

Long-range transport of 2D excitons in dynamic acoustic lattice

学校读者我要写书评

暂无评论

arXiv 2021年

关键词： Acoustic surface wave devices

Anomalous Lorenz number in massive and tilted Dirac systems

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Sengupta, Parijat Bellotti, Enrico Dept. of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Dept. of Electrical and Computer Engineering Material Science Division Boston University BostonMA02215 United States

We analytically calculate the anomalous transverse electric and thermal currents in massive and tilted Dirac systems, using β-borophene as a representative material, and report on conditions under which the corresponding Lorenz number (Lan) deviates from its classically accepted value (L0). The deviations in the high-temperature regime are shown to be an outcome of the quantitative difference in the respective kinetic transport expressions for electric (σ) and thermal (κ) conductivity, and are further weighted through a convolution integral with a non-linearly energy-dependent Berry curvature that naturally arises in a Dirac material. In addition, the tilt and anisotropy of the Dirac system that are amenable to change via external stimulus are found to quantitatively influence Lan. The reported deviations from L0 hold practical utility inasmuch as they allow an independent tuning of σ and κ, useful in optimizing the output of thermoelectric devices. Copyright © 2020, The Authors. All rights reserved.

关键词：

Method of moment analysis of carbon nanotubes embedded in a lossy dielectric slab using a multilayer dyadic green’s function

学校读者我要写书评

暂无评论

TechRxiv

TechRxiv 2021年

作者： Dey, Sumitra Chatterjee, Deb Garboczi, Edward J. Hassan, Ahmed M. Department of Computer Science and Electrical Engineering University of Missouri–Kansas City Kansas CityMO64110 United States Material Measurement Laboratory Applied Chemicals and Materials Division National Institute of Standards and Technology BoulderCO80305 United States

Modeling the electromagnetic response of carbon nanotube (CNT) reinforced composites is inherently a three-dimensional (3D) multi-scale problem that is challenging to solve in real-time for nondestructive evaluation applications. This article presents a fast and accurate full-wave electromagnetic solver based on a multi-layer dyadic Green’s function approach. In this approach, we account for the effects of the dielectric slab, where the CNTs are embedded, without explicitly discretizing its interfaces. Due to their large aspect ratios, the CNTs are modeled as arbitrary thin wires (ATWs), and the method of moment (MoM) formulation with distributed line impedance is used to solve for their coupled currents. The accuracy of the in-house solver is validated against commercial method of moment (MoM) and finite element method (FEM) solvers over a broad range of frequencies (from 1 GHz to 10 THz) and for a wide range of dielectric slab properties. Examples of 100 nm long vertical and horizontal CNTs embedded in a 1 µm thick lossy dielectric substrate are presented. The in-house solver provides more than 50 × speed up while solving the vertical CNT, and more than 570 × speed up while solving the horizontal CNT than a commercial MoM solver over the GHz to THz frequency range. © 2021, CC BY-NC-SA.

关键词： Method of moments

Construction, modeling, and control of a three-beam prototype using interactive fiber rubber composites

学校读者我要写书评

暂无评论

PAMM 2023年第4期23卷

作者： Aline Iobana Acevedo-Velazquez Najmeh Keshtkar Johannes Mersch Konrad Katzer Chokri Cherif Martina Zimmermann Gerald Gerlach Klaus Röbenack Institute of Control Theory Faculty of Electrical and Computer Engineering TUD Dresden University of Technology Dresden Germany Correspondece Institute of Solid-State Electronics Faculty of Electrical and Computer Engineering TUD Dresden University of Technology Dresden Germany Fraunhofer Institute for Material and Beam Technology IWS Dresden Germany Institute for Material Science Faculty of Mechanical Engineering TUD Dresden University of Technology Dresden Germany Institute of Textile Machinery and High Performance Material Technology Faculty of Mechanical Engineering TUD Dresden University of Technology Dresden Germany

In this contribution, we discuss the construction, modeling, and control of a three-beam prototype that utilizes interactive fiber rubber composites integrated with shape memory alloys (SMAs) as actuators. These actuators are integrated into a textile layer and covered with an elastomer layer, providing flexibility and protection to the prototype. A mathematical model was developed to describe the behavior of the prototype, employing system identification techniques. However, precise position control of systems actuated by SMAs is challenging due to their inherent nonlinearities and hysteretic behavior. To tackle this challenge, a proportional-integral (PI) controller was designed based on robust stability conditions. The effectiveness of the designed PI controller was validated through both numerical simulations and real experiments.

关键词：

Effects of proton irradiation on hole carrier transport in hydrogen-terminated diamond surfaces

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Peterson, Ricardo Malakoutian, Mohamadali Wang, Yongqiang Chowdhury, Srabanti Senesky, Debbie Department of Electrical Engineering Stanford University CA94305 United States Department of Electrical and Computer Engineering University of California DavisCA95616 United States Material Science and Technology Division Los Alamos National Laboratory Los AlamosNM87545 United States Department of Aeronautics and Astronautics Stanford University CA94305 United States

In this letter, we report the effects of irradiating hydrogen-terminated diamond surfaces with protons. We study the electrical behavior of the two-dimensional hole gas that forms on the diamond surface as a result of hydrogen-termination. Four diamond samples, two of which were passivated with Al2O3 and the other two unpassivated, were irradiated with 2 MeV protons at two fluences, 0.5×1014 and 1.0×1014 cm−2. The hole conductivity degraded at a higher proton fluence, which is attributed to the reduction of the mobility caused by enhanced hole scattering. Both passivated and unpassivated samples exhibited a reduction in the mobility, which can be explained by charging effects of the Al2O3 (for the passivated samples) and degradation of the hydrogen-terminated surface (for the unpassivated samples). To our knowledge, this is the first reported data on 2 MeV proton tolerance of hydrogen-terminated diamond surfaces. © 2021, CC BY.

关键词： Proton irradiation