Article
Optics
Junyi Duan, Xiaochi Liu, Yadong Zhou, Xin-Biao Xu, Liang Chen, Chang-Ling Zou, Zhendong Zhu, Zhilong Yu, Ning Ru, Jifeng Qu
Summary: Magneto-optical traps based on grating chips simplify cold atom physical package architectures significantly. A high-diffraction-efficiency grating magneto-optical trap (GMOT) design and fabrication are reported. The fabricated grating chip achieved a diffraction efficiency of up to 40% and successfully trapped a large number of atoms. The proposed atom chip can be used for compact cold atom clocks and other cold atom-based quantum sensors.
OPTICS COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Frank Angeles, Samreen Khan, Victor H. H. Ortiz, Mingfei Xu, Shisong Luo, Dinusha Herath Mudiyanselage, Houqiang Fu, Yuji Zhao, Richard B. B. Wilson
Summary: The thermal conductivity of wide bandgap semiconductor thin films has a significant impact on the performance of various devices. However, accurately measuring the thermal conductivity of sub-micrometer thin films with high values is difficult. This study proposes a combination of magneto-optic thermometry and TiN interfacial layers to enhance the spatiotemporal resolution of pump/probe thermal transport measurements.
Article
Quantum Science & Technology
C. J. Martoff, F. Granato, V Palmaccio, X. Yu, P. F. Smith, E. R. Hudson, P. Hamilton, C. Schneider, E. Chang, A. Renshaw, F. Malatino, P. D. Meyers, B. Lamichhane
Summary: This project aims to develop a high-precision laboratory-scale experiment to search for very weakly coupled sterile neutrinos in the mass range extending from 5-10 keV/c(2) to several 100 keV/c(2). The experiment utilizes K-capture events in Cs-131 atoms suspended in vacuum by a magneto-optical trap (MOT) and has the potential to reach sterile neutrino mixing angles down to sin(2) theta similar to 10(-4). Detailed calculations and simulations of significant background processes have been conducted.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
A. Golovizin, D. Tregubov, D. Mishin, D. Provorchenko, N. Kolachevsky
Summary: This article introduces a compact vacuum system for laser cooling and spectroscopy of neutral thulium atoms, achieving compactness through adjustments in configuration. The system demonstrates potential for use in optical atomic clocks.
Article
Optics
M. Gaudesius, Y-C Zhang, T. Pohl, R. Kaiser, G. Labeyrie
Summary: This study analyzed the spatiotemporal instabilities of large clouds of cold atoms in a magneto-optical trap through three-dimensional simulations. The research revealed different dynamical regimes in the phase space of the instabilities, providing a detailed analysis of the experimental observations.
Article
Physics, Multidisciplinary
T. K. Langin, D. DeMille
Summary: Recent experiments have shown that it is possible to directly cool and trap diatomic and triatomic molecules in magneto-optical traps (MOTs). However, the density achieved in molecular MOTs is still 10(-5) times smaller than in atomic MOTs. The main limitations are the inefficiencies in slowing down molecules to capture velocities and the density limits within the MOT due to sub-Doppler heating. Driving 'Type-II' optical cycling transitions that involve dark states in Zeeman sublevels is necessary to avoid rotational branching. Simulations have been presented to address these limitations and pave the way for evaporative cooling of molecules to quantum degeneracy.
NEW JOURNAL OF PHYSICS
(2023)
Article
Instruments & Instrumentation
Y. Zhou, Y. J. Zhai, Q. Y. Jin, Y. G. Liu, L. B. Li, P. Zhang, S. Zhang, H. W. Zhao, L. T. Sun
Summary: In this paper, a compact RF ion source is presented for the production of negative oxygen ion beams for SIMS application. Experimental results show that this ion source can extract high brightness and low energy spread negative oxygen ion beams.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Physical
Oskar Asvany, Sven Thorwirth, Philipp C. C. Schmid, Thomas Salomon, Stephan Schlemmer
Summary: The ro-vibrational and pure rotational spectra of the linear ion HC3O+ were studied using a novel action spectroscopic technique named leak-out spectroscopy (LOS). A total of 45 ro-vibrational transitions within the fundamental band of the ν(1) C-H stretching mode were measured. Surprisingly, two hot bands were detected despite the cryogenic operation temperature. A new double-resonance rotational measurement scheme was established based on the LOS method. In addition, a pulsed laser system was employed to record a low resolution vibrational spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Applied
S. Supakar, Vivek Singh, V. B. Tiwari, S. R. Mishra
Summary: In this study, the ultra-high vacuum (UHV) background pressure as low as 1.1 x 10(-10) Torr was measured using the loss rate characteristics of a vapor-loaded magneto-optical trap (MOT) formed on an atom chip in a UHV chamber. The loss rate due to non-rubidium (Rb) gases in the background was estimated by operating the MOT in low cooling beam intensities and low Rb pressure regimes simultaneously. In our setup, contributions of intra-trap collisions and background MOT species collisions to the measured trap loss rate were minimized. These results have potential applications in the development of cold-atom based UHV pressure standards.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
S. Xu, P. Kaebert, M. Stepanova, T. Poll, M. Siercke, S. Ospelkaus
Summary: This study presents a general method for optimizing molecular magneto-optical trap operation using Bayesian optimization, with a focus on optimizing a calcium fluoride MOT for maximum capture velocity. The results show that the optimized capture velocity logarithmically depends on beam power, providing a potential route to more robust MOTs for heavy molecules such as BaH, BaF, YbF, and YbOH with low capture velocities.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Martin Schlederer, Alexandra Mozdzen, Thomas Lompe, Henning Moritz
Summary: A modified scheme is proposed to address the issue of stringent minimization of stray light from the MOT beams, achieving reliable discrimination of up to 17 K-40 atoms with classification fidelities of similar to 98% for up to 5 atom numbers and fidelities of more than 85% for up to 17 atoms.
Article
Chemistry, Physical
Pritesh Parikh, Hyeseung Chung, Ethan Vo, Abhik Banerjee, Ying Shirley Meng, Arun Devaraj
Summary: Nickel-rich cathodes are crucial for the energy density of electric vehicles. However, their long-term capacity retention is poor due to material issues. There is limited understanding of the composition and distribution of lithium in nickel-rich cathodes. Therefore, establishing a method for quantitative analysis of battery cathodes is critical.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Zhengwei Tan, Zheng Ma, Laura Fuentes, Maciej Oskar Liedke, Maik Butterling, Ahmed G. Attallah, Eric Hirschmann, Andreas Wagner, Llibertat Abad, Nieves Casan-Pastor, Aitor F. Lopeandia, Enric Menendez, Jordi Sort
Summary: Magneto-ionics refers to the control of magnetic properties of materials through voltage-driven ion motion. A nanoscale-engineered magneto-ionic architecture is proposed, which improves cyclability and maintains high electric fields through the insertion of a highly nanostructured Ta layer.
Article
Chemistry, Multidisciplinary
Zhengwei Tan, Zheng Ma, Laura Fuentes, Maciej Oskar Liedke, Maik Butterling, Ahmed G. Attallah, Eric Hirschmann, Andreas Wagner, Llibertat Abad, Nieves Casan-Pastor, Aitor F. Lopeandia, Enric Menendez, Jordi Sort
Summary: Magneto-ionics refers to controlling magnetic properties of materials through voltage-driven ion motion. A nanoscale-engineered magneto-ionic architecture is proposed, which significantly enhances cyclability by inserting a highly nanostructured Ta layer between a solid electrolyte and a liquid electrolyte. This strategy combines the benefits of solid and liquid electrolytes to boost magneto-ionics.
Article
Chemistry, Analytical
David Klenerman, Yuri Korchev, Pavel Novak, Andrew Shevchuk
Summary: The reduction in ion current near a cell surface when a fine pipette approaches allows imaging of cell surface topography with nanoscale resolution without damaging the delicate surface. By combining various methods such as single-channel recording, force application, and fluorescence imaging, there is great potential to image and map live cell surfaces at the nanoscale with high resolution and speed.
ANNUAL REVIEW OF ANALYTICAL CHEMISTRY, VOL 14, 2021
(2021)
Article
Optics
William R. McGehee, Thomas Michels, Vladimir Aksyuk, Jabez J. Mcclelland
Correction
Multidisciplinary Sciences
Brian D. Hoskins, Gina C. Adam, Evgheni Strelcov, Nikolai Zhitenev, Andrei Kolmakov, Dmitri B. Strukov, Jabez J. McClelland
NATURE COMMUNICATIONS
(2018)
Article
Chemistry, Physical
Jana Kalbacova, Elias Garratt, Raul D. Rodriguez, Angela R. Hight Walker, Kevin A. Twedt, Jeffrey A. Fagan, Teresa. I. Madeira, Jabez J. McClelland, Babak Nikoobakht, Dietrich R. T. Zahn
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Physics, Applied
J. R. Gardner, W. R. McGehee, J. J. McClelland
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
William R. McGehee, Evgheni Strelcov, Vladimir P. Oleshko, Christopher Soles, Nikolai B. Zhitenev, Jabez J. McClelland
Article
Multidisciplinary Sciences
Jonathan M. Goodwill, Georg Ramer, Dasheng Li, Brian D. Hoskins, Georges Pavlidis, Jabez J. McClelland, Andrea Centrone, James A. Bain, Marek Skowronski
NATURE COMMUNICATIONS
(2019)
Article
Neurosciences
Brian D. Hoskins, Matthew W. Daniels, Siyuan Huang, Advait Madhavan, Gina C. Adam, Nikolai Zhitenev, Jabez J. McClelland, Mark D. Stiles
FRONTIERS IN NEUROSCIENCE
(2019)
Article
Physics, Applied
A. Zaslavsky, C. A. Richter, P. R. Shrestha, B. D. Hoskins, S. T. Le, A. Madhavan, J. J. McClelland
Summary: This research reveals sharp current jumps and stable hysteretic loops in drain current at cryogenic temperatures when operating CMOS transistors at voltages exceeding 1.3V. The mechanism responsible for device bistability is impact ionization charging, leading to effective back-gating of the inversion channel. This phenomenon can be utilized for compact capacitorless single-transistor memory with long retention times.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Elliot J. Fuller, Evgheni Strelcov, Jamie L. Weaver, Michael W. Swift, Joshua D. Sugar, Andrei Kolmakov, Nikolai Zhitenev, Jabez J. McClelland, Yue Qi, Joseph A. Dura, A. Alec Talin
Summary: The performance of solid-state electrochemical systems is closely related to the potential and lithium distributions across electrolyte-electrode junctions. By combining KPFM and NDP methods to analyze Si-LiPON-LiCoO2 solid-state batteries, it was observed that the largest potential drop and lithium concentration variation occur at the anode-electrolyte interface, indicating a rate-limiting interfacial process in batteries.
ACS ENERGY LETTERS
(2021)
Article
Physics, Applied
Jonathan M. Goodwill, Nitin Prasad, Brian D. Hoskins, Matthew W. Daniels, Advait Madhavan, Lei Wan, Tiffany S. Santos, Michael Tran, Jordan A. Katine, Patrick M. Braganca, Mark D. Stiles, Jabez J. McClelland
Summary: The increasing scale of neural networks and their expanding applications have led to a demand for more energy-efficient and memory-efficient artificial intelligence-specific hardware. To address the main issue of the von Neumann bottleneck, in-memory and near-memory architectures, as well as algorithmic methods, can be utilized. The low-power and binary operation of magnetic tunnel junctions (MTJs) have been leveraged for neural network hardware inference, showing the potential for efficient performance even with device imperfections.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Electrical & Electronic
Jingjia Meng, Jonathan M. Goodwill, Evgheni Strelcov, Kefei Bao, Jabez J. McClelland, Marek Skowronski
Summary: Understanding the physical changes during electroformation and switching processes in transition-metal-oxide-based non-volatile memory devices is important for advancing this technology. In this study, scanning thermal microscopy measurements were conducted in vacuum on TaOx-based memory devices to assess the characteristics of these devices. The results showed that a hot spot is created by a gap in the conducting filament that forms closest to the anode during the electroformation process. Additionally, the gap disappears when the device is switched from high resistance to low resistance.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Jingjia Meng, Jonathan M. Goodwill, Evgheni Strelcov, Kefei Bao, Jabez J. McClelland, Marek Skowronski
Summary: Understanding the physical changes during electroformation and switching processes in transition-metal-oxide-based non-volatile memory devices is crucial for advancing this technology. In this study, scanning thermal microscopy measurements were performed on TaOx-based memory devices, revealing that the surface temperature footprints of the filament were influenced by the polarity of electroforming and the resistance states of the device. These findings provide insights into the formation and switching mechanisms of the devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
William R. McGehee, Wenqi Zhu, Daniel S. Barker, Daron Westly, Alexander Yulaev, Nikolai Klimov, Amit Agrawal, Stephen Eckel, Vladimir Aksyuk, Jabez J. McClelland
Summary: The use of metasurface optic for beam shaping and polarization control enables laser cooling of atomic Rb, leading to miniaturized quantum devices and calibration-free sensors utilizing the properties of cold atoms.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Materials Science, Multidisciplinary
Philippe Talatchian, Matthew W. Daniels, Advait Madhavan, Matthew R. Pufall, Emilie Jue, William H. Rippard, Jabez J. McClelland, Mark D. Stiles
Summary: Coupling SMTJs can lead to collective behavior beneficial for cognitive computing. By using a simple linear electrical circuit to mutually couple two SMTJs, the transitions of one SMTJ can affect the states of the other, resulting in significant correlation between the two devices.
Article
Engineering, Electrical & Electronic
Jamie R. Gardner, William R. McGehee, Mark D. Stiles, Jabez J. McClelland
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
