arXiv: Applied Physics最新文献_第4页

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers 等离子体衰变动力学与表面增强拉曼光谱背景之间的联系:非热和热载流子的非弹性散射

arXiv: Applied Physics Pub Date : 2020-10-14 DOI: 10.1063/5.0032763

Shengxian Wu, Oscar Hsu-Cheng Cheng, B. Zhao, Nicki Hogan, An-Tse Lee, D. Son, M. Sheldon

{"title":"The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers","authors":"Shengxian Wu, Oscar Hsu-Cheng Cheng, B. Zhao, Nicki Hogan, An-Tse Lee, D. Son, M. Sheldon","doi":"10.1063/5.0032763","DOIUrl":"https://doi.org/10.1063/5.0032763","url":null,"abstract":"Recent studies have established that the anti-Stokes Raman signal from plasmonic metal nanostructures can be used to determine the two separate temperatures that characterize carriers inside the metal -- the temperature of photoexcited \"hot carriers\" and carriers that are thermalized with the metal lattice. However, the related signal in the Stokes spectral region has historically impeded surface enhanced Raman spectroscopy (SERS), as the vibrational peaks of adsorbed molecules are always accompanied by the broad background of the metal substrate. The fundamental source of the metal signal, and hence its contribution to the spectrum, has been unclear. Here, we outline a unified theoretical model that describes both the temperature-dependent behavior and the broad spectral distribution. We suggest that the majority of the Raman signal is from inelastic scattering directly with non-thermal carriers that have been excited via damping of the surface plasmon. In addition, a significant spectral component (~ 1%) is due to a sub-population of hot carriers in an elevated thermal distribution. We have performed temperature and power-dependent Raman experiments to show how a simple fitting procedure reveals the plasmon dephasing time, as well as the temperatures of the hot carriers and the metal lattice, in order to correlate these parameters with quantitative Raman analysis of chemical species adsorbed on metal surface.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89595497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

An Investigation On Neck Extensions For Single and Multi-Degree Of Freedom Acoustic Helmholtz Resonators 单自由度和多自由度声学亥姆霍兹谐振器颈部延伸的研究

arXiv: Applied Physics Pub Date : 2020-10-12 DOI: 10.2514/6.2021-2206

A. Gautam, A. Celik, M. Azarpeyvand

引用次数: 2

Thermodynamic driving force of transient negative capacitance of ferroelectric capacitors 铁电电容器瞬态负电容的热力学驱动力

arXiv: Applied Physics Pub Date : 2020-10-07 DOI: 10.1063/5.0039246

Yuanyuan Zhang, Xiaoqing Sun, Junshuai Chai, Hao Xu, Xueli Ma, J. Xiang, Kai Han, Xiaolei Wang, Wenwu Wang

引用次数: 1

Experimental validation of differential evolution indicators for ultrasonic imaging in unknown backgrounds 未知背景下超声成像差分演化指标的实验验证

arXiv: Applied Physics Pub Date : 2020-10-05 DOI: 10.1016/j.ymssp.2021.108029

Fatemeh Pourahmadian

引用次数: 5

Laser-processing of grinded and mechanically abraded Nb-surfaces 研磨和机械研磨铌表面的激光加工

arXiv: Applied Physics Pub Date : 2020-09-30 DOI: 10.2351/7.0000160

V. Porshyn, P. Rothweiler, D. Lützenkirchen-Hecht

引用次数: 0

A hybrid optoelectronic Mott insulator 一种混合光电莫特绝缘体

arXiv: Applied Physics Pub Date : 2020-09-28 DOI: 10.1063/5.0044066

Henry Navarro, J. D. Valle, Y. Kalcheim, N. Vargas, C. Adda, Min-Han Lee, P. Lapa, A. Rivera‐Calzada, I. Zaluzhnyy, Erbin Qiu, O. Shpyrko, M. Rozenberg, A. Frano, I. Schuller

{"title":"A hybrid optoelectronic Mott insulator","authors":"Henry Navarro, J. D. Valle, Y. Kalcheim, N. Vargas, C. Adda, Min-Han Lee, P. Lapa, A. Rivera‐Calzada, I. Zaluzhnyy, Erbin Qiu, O. Shpyrko, M. Rozenberg, A. Frano, I. Schuller","doi":"10.1063/5.0044066","DOIUrl":"https://doi.org/10.1063/5.0044066","url":null,"abstract":"The coupling of electronic degrees of freedom in materials to create hybridized functionalities is a holy grail of modern condensed matter physics that may produce novel mechanisms of control. Correlated electron systems often exhibit coupled degrees of freedom with a high degree of tunability which sometimes lead to hybridized functionalities based on external stimuli. However, the mechanisms of tunability and the sensitivity to external stimuli are determined by intrinsic material properties which are not always controllable. A Mott metal-insulator transition, which is technologically attractive due to the large changes in resistance, can be tuned by doping, strain, electric fields, and orbital occupancy but cannot be, in and of itself, controlled externally with light. Here we present a new approach to produce hybridized functionalities using a properly engineered photoconductor/strongly-correlated hybrid heterostructure, showing control of the Metal-to-Insulator transition (MIT) using optical means. This approach combines a photoconductor, which does not exhibit an MIT, with a strongly correlated oxide, which is not photoconducting. Due to the close proximity between the two materials, the heterostructure exhibits large volatile and nonvolatile, photoinduced resistivity changes and substantial photoinduced shifts in the MIT transition temperatures. This approach can potentially be extended to other judiciously chosen combinations of strongly correlated materials with systems which exhibit optically, electrically or magnetically controllable behavior.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74859619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Deployable Tensegrity Lunar Tower 可展开的张拉整体月球塔

arXiv: Applied Physics Pub Date : 2020-09-27 DOI: 10.1061/9780784483374.100

Muhao Chen, R. Goyal, M. Majji, R. Skelton

引用次数: 10

Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments 不同材料和热处理的七个几何形状相似的真空室的放气率比较

arXiv: Applied Physics Pub Date : 2020-09-22 DOI: 10.1116/6.0000657

J. Fedchak, J. Scherschligt, S. Avdiaj, D. Barker, S. Eckel, B. Bowers, Scott OConnell, Perry A. Henderson

{"title":"Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments","authors":"J. Fedchak, J. Scherschligt, S. Avdiaj, D. Barker, S. Eckel, B. Bowers, Scott OConnell, Perry A. Henderson","doi":"10.1116/6.0000657","DOIUrl":"https://doi.org/10.1116/6.0000657","url":null,"abstract":"We have measured the water and hydrogen outgassing rates of seven vacuum chambers of identical geometry but constructed of different materials and heat treatments. Chambers of five different materials were tested: 304L, 316L, and 316LN stainless steels; titanium; and aluminum. In addition, chambers constructed of 316L and 316LN stainless steel were subjected to a vacuum-fire process, where they were heated to approximately 950 °C for 24 hours while under vacuum. These latter two chambers are designated as 316L-XHV and 316LN-XHV. Because all the chambers were of identical geometry and made by the same manufacturer, a relative comparison of the outgassing rates among these chambers can be made. Water outgassing rates were measured as a function of time using the throughput technique. The water outgassing results for the 316L, 316LN, 316L-XHV, 316LN-XHV were all similar, but lower than those of 304L by a factor of 3 to 5 lower at 10,000 s. The water outgassing results for Ti and Al chambers were closer to that of 304L, Ti being slightly lower. Hydrogen outgassing rates were measured using the rate-of-rise method and performed after a low-temperature bake of 125 °C to 150 °C for a minimum of 72 hours. The Ti, Al, 316L-XHV, and 316LN-XHV chambers all have ultra-low specific outgassing rates below 1.0E-11 Pa L s-1 cm-2 and are a factor of 100 or better than the 304L chamber. The 304L, 316L, and 316LN chambers with no vacuum-fire heat treatment have larger hydrogen outgassing rates than the other chambers, with determined specific outgassing rates ranging between 4.0E-11 Pa L s-1 cm-2 and 8.0E-11 Pa L s-1 cm-2. We conclude that Ti, Al, 316L-XHV, and 316LN-XHV have hydrogen outgassing rates that make them excellent choices for ultra-high vacuum (UHV) and extreme-high vacuum (XHV) applications, the choice depending on cost and other material properties.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88312326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Magnon-mediated spin currents in Tm3Fe5O12/Pt with perpendicular magnetic anisotropy 垂直磁各向异性Tm3Fe5O12/Pt中磁介子介导的自旋电流

arXiv: Applied Physics Pub Date : 2020-09-22 DOI: 10.1063/5.0023242

G. Vilela, J. E. Abrão, E. Santos, Y. Yao, J. Mendes, R. L. Rodríguez-Suárez, S. Rezende, W. Han, A. Azevedo, J. Moodera

{"title":"Magnon-mediated spin currents in Tm3Fe5O12/Pt with perpendicular magnetic anisotropy","authors":"G. Vilela, J. E. Abrão, E. Santos, Y. Yao, J. Mendes, R. L. Rodríguez-Suárez, S. Rezende, W. Han, A. Azevedo, J. Moodera","doi":"10.1063/5.0023242","DOIUrl":"https://doi.org/10.1063/5.0023242","url":null,"abstract":"The control of pure spin currents carried by magnons in magnetic insulator (MI) garnet films with a robust perpendicular magnetic anisotropy (PMA) is of great interest to spintronic technology as they can be used to carry, transport and process information. Garnet films with PMA present labyrinth domain magnetic structures that enrich the magnetization dynamics, and could be employed in more efficient wave-based logic and memory computing devices. In MI/NM bilayers, where NM being a normal metal providing a strong spin-orbit coupling, the PMA benefits the spin-orbit torque (SOT) driven magnetization's switching by lowering the needed current and rendering the process faster, crucial for developing magnetic random-access memories (SOT-MRAM). In this work, we investigated the magnetic anisotropies in thulium iron garnet (TIG) films with PMA via ferromagnetic resonance measurements, followed by the excitation and detection of magnon-mediated pure spin currents in TIG/Pt driven by microwaves and heat currents. TIG films presented a Gilbert damping constant {alpha}~0.01, with resonance fields above 3.5 kOe and half linewidths broader than 60 Oe, at 300 K and 9.5 GHz. The spin-to-charge current conversion through TIG/Pt was observed as a micro-voltage generated at the edges of the Pt film. The obtained spin Seebeck coefficient was 0.54 {mu}V/K, confirming also the high interfacial spin transparency.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78632161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Cryogenic cleaning of tin-drop contamination on surfaces relevant for extreme ultraviolet light collection 低温清洗与极紫外光收集有关的表面锡滴污染

arXiv: Applied Physics Pub Date : 2020-09-22 DOI: 10.1116/6.0000501

N. Böwering, C. Meier

{"title":"Cryogenic cleaning of tin-drop contamination on surfaces relevant for extreme ultraviolet light collection","authors":"N. Böwering, C. Meier","doi":"10.1116/6.0000501","DOIUrl":"https://doi.org/10.1116/6.0000501","url":null,"abstract":"Improvement of tool reliability and uptime is a current focus in development of extreme ultraviolet lithography. The lifetime of collection mirrors for extreme ultraviolet light in tin-based plasma light sources is limited considerably by contamination with thick tin deposits that cannot be removed sufficiently fast by plasma etching. For tin droplet splats sticking to large substrates, we have developed and compared several efficient cleaning techniques based on cryogenic cooling. A silicon carbide substrate and different silicon wafer samples with up to 6 inch diameter with the surface uncoated, multilayer-coated, unstructured and grating-structured were tested. After tin dripping onto heated samples, embrittlement of droplet contamination is induced in-situ by stresses during phase transformation, following the initiation of tin pest with seed crystals of gray tin. Conversion of initially adhesive deposits to loose gray tin has been reached in less than 24 hours on all tested surfaces by continuous cooling with cold nitrogen vapor to temperatures in the range of -30 to -50 °C. Alternatively, stress-initiated tin-removal by delamination of beta-Sn droplet splats has been attained via contraction strain induced by strong cooling to temperatures of around -120 °C. Profilometry has been used to analyze the bottom side of tin droplet splats removed from a grating-structured wafer. The in-situ tin cleaning techniques give results comparable to fast ex-situ cleaning that has been achieved either by sample immersion in liquid nitrogen or by splat removal after CO2 snowflake aerosol impact using a hand-held jet-nozzle. The implementation of the in-situ phase-conversion concept for the cleaning of collector mirrors in commercial light sources for lithography is discussed.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90541124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2