Browsing FAS Scholarly Articles by Title
Now showing items 7575-7594 of 18292
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Imaging ATUM ultrathin section libraries with WaferMapper: a multi-scale approach to EM reconstruction of neural circuits
(Frontiers Media S.A., 2014)The automated tape-collecting ultramicrotome (ATUM) makes it possible to collect large numbers of ultrathin sections quickly—the equivalent of a petabyte of high resolution images each day. However, even high throughput ... -
Imaging Bond Order Near Nonmagnetic Impurities in Square-Lattice Antiferromagnets
(American Physical Society, 2008)We study the textures of generalized “charge densities” (scalar objects invariant under time reversal), in the vicinity of nonmagnetic impurities in square-lattice quantum antiferromagnets, by order parameter field theories. ... -
Imaging Chromophores With Undetectable Fluorescence by Stimulated Emission Microscopy
(Nature Publishing Group, 2009)Fluorescence, that is, spontaneous emission, is generally more sensitive than absorption measurement, and is widely used in optical imaging. However, many chromophores, such as haemoglobin and cytochromes, absorb but have ... -
Imaging Coherent Transport in Graphen (Part II): Probing Weak Localization
(Institute of Physics, 2010)Graphene has opened new avenues of research in quantum transport, with potential applications for coherent electronics. Coherent transport depends sensitively on scattering from microscopic disorder present in graphene ... -
Imaging Coherent Transport in Graphene (Part I): Mapping Universal Conductance Fluctuations
(Institute of Physics, 2010)Graphene provides a fascinating testbed for new physics and exciting opportunities for future applications based on quantum phenomena. To understand the coherent flow of electrons through a graphene device, we employ a ... -
Imaging Cyclotron Orbits of Electrons in Graphene
(American Chemical Society (ACS), 2016)Electrons in graphene can travel for several microns without scattering at low temperatures, and their motion becomes ballistic, following classical trajectories. When a magnetic field B is applied perpendicular to the ... -
Imaging electron flow and quantum dot formation in MoS2 nanostructures
(IOP, 2017)Among newly discovered two-dimensional (2D) materials, semiconducting ultrathin sheets of MoS2 show potential for nanoelectronics. However, the carrier mobility in MoS2 is limited by scattering from surface impurities and ... -
Imaging Electron Motion in a Few Layer MoS2 Device
(IOP Publishing, 2017)Ultrathin sheets of MoS2 are a newly discovered 2D semiconductor that holds great promise for nanoelectronics. Understanding the pattern of current flow will be crucial for developing devices. In this talk, we present ... -
Imaging electron motion in graphene
(IOP Publishing, 2017)A cooled scanning probe microscope (SPM) is an ideal tool to image electronic motion in graphene: the SPM tip acts as a scanning gate, which interacts with the electron gas below. We introduce the technique using our group's ... -
Imaging Emergent Heavy Dirac Fermions of a Topological Kondo Insulator
(Springer Science and Business Media LLC, 2019-11-11)The interplay between strong electron interactions and band topology is a new frontier in the search for exotic quantum phases. The Kondo insulator SmB6 has emerged as a promising platform as its correlation-driven bulk ... -
Imaging Evaluation of 5HT\(_{2C}\) Agonists, [\(^{11}\)C]WAY-163909 and [\(^{11}\)C]Vabicaserin, Formed by Pictet–Spengler Cyclization
(American Chemical Society (ACS), 2014)The serotonin subtype 2C (5HT\(_{2C}\)) receptor is an emerging and promising drug target to treat several disorders of the human central nervous system. In this current report, two potent and selective 5HT\(_{2C}\) full ... -
Imaging GFP-Based Reporters in Neurons with Multiwavelength Optogenetic Control
(Elsevier BV, 2014)To study the impact of neural activity on cellular physiology, one would like to combine precise control of firing patterns with highly sensitive probes of cellular physiology. Light-gated ion channels, e.g., Channelrhodopsin-2, ... -
Imaging grain boundary grooves in hard-sphere colloidal bicrystals
(American Physical Society, 2016) -
Imaging hydrogen peroxide in Alzheimer’s disease via cascade signal amplification
(Nature Publishing Group, 2016)In brains of Alzheimer’s disease (AD), reactive oxygen species (ROS) levels are significantly higher than that of healthy brains. Evidence suggests that, during AD onset and progression, a vicious cycle revolves around ... -
Imaging Magnetic Polarons in the Doped Fermi-Hubbard Model
Polarons are among the most fundamental quasiparticles emerging in interacting many-body systems, forming already at the level of a single mobile dopant. In the context of the two-dimensional Fermi-Hubbard model, such ... -
Imaging Magnetic Polarons in the Doped Fermi–Hubbard Model
(Springer Science and Business Media LLC, 2019-08-14)Polarons are among the most fundamental quasiparticles emerging in interacting many-body systems, forming already at the level of a single mobile dopant [1]. In the context of the two- dimensional ... -
Imaging Mesoscopic Nuclear Spin Noise with a Diamond Magnetometer
(American Institute of Physics, 2010)Magnetic resonance imaging can characterize and discriminate among tissues using their diverse physical and biochemical properties. Unfortunately, submicrometer screening of biological specimens is presently not possible, ... -
Imaging Multiple Colloidal Particles by Fitting Electromagnetic Scattering Solutions to Digital Holograms
(Elsevier BV, 2012)Digital holographic microscopy is a fast three-dimensional (3D) imaging tool with many applications in soft matter physics. Recent studies have shown that electromagnetic scattering solutions can be fit to digital holograms ... -
Imaging of the CO Snow Line in a Solar Nebula Analog
(American Association for the Advancement of Science (AAAS), 2013)Planets form in the disks around young stars. Their formation efficiency and composition are intimately linked to the protoplanetary disk locations of “snow lines” of abundant volatiles. We present chemical imaging of the ... -
Imaging Poliovirus Entry in Live Cells
(Public Library of Science, 2007)Viruses initiate infection by transferring their genetic material across a cellular membrane and into the appropriate compartment of the cell. The mechanisms by which animal viruses, especially nonenveloped viruses, deliver ...