155 research outputs found
The girl is kind of image-like : female passivity in the fiction of Fanny Fern
In each of Fanny Fern\u27s three works of fiction (Ruth Hall, Fanny Ford, and Rose Clark), the title character is a very passive female. In the past, this has hindered people from studying these works, since a passive character is hard to become interested in. This thesis examines exactly that feature of each of these characters and attempts to show that Fanny Fern created these characters deliberately and subversively, in an attempt to show exactly how limiting and unbelievable the ideal of the true woman actually was. Special attention is paid to Fanny Ford and Rose Clark, which have been neglected by most critics in recent years. A comprehensive bibliography of Fanny Fern resources is appended
Sovereign Immunity-Judicial Abrogatoin of North Dakota\u27s Sovereign Immunity Results in Its Possible Legislative Reassertion and Legislation to Provide Injured Parties a Remedy for the Torts Committed by the State or Its Agents
Observation of vortices and hidden pseudogap from scanning tunneling spectroscopic studies of electron-doped cuprate superconductor
We present the first demonstration of vortices in an electron-type cuprate
superconductor, the highest (= 43 K) electron-type cuprate
. Our spatially resolved quasiparticle tunneling spectra
reveal a hidden low-energy pseudogap inside the vortex core and unconventional
spectral evolution with temperature and magnetic field. These results cannot be
easily explained by the scenario of pure superconductivity in the ground state
of high- superconductivity.Comment: 6 pages, 4 figures. Two new graphs have been added into Figure 2.
Accepted for publication in Europhysics Letters. Corresponding author:
Nai-Chang Yeh (E-mail: [email protected]
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Nanoscale Magnetic Resonance Imaging and Magnetic Sensing Using Atomic Defects in Diamond
Magnetic resonance imaging (MRI) has revolutionized modern medicine by providing non-invasive, chemically selective, three-dimensional imaging of living organisms. Industrial-scale MRI has the capability to image with millimeter-scale spatial resolution and has the sensitivity to detect as few as nuclear spins. Increasing spatial resolution to the atomic scale and sensitivity to the single-spin level would enable a wide array of applications most notably including imaging molecular structur. However, conventional MRI methods are already highly optimized, and further order-of-magnitude-scale improvements cannot be reasonably expected without employing fundamentally different technologies.Physic
Four-dimensional ultrafast electron microscopy of phase transitions
Reported here is direct imaging (and diffraction) by using 4D ultrafast electron microscopy (UEM) with combined spatial and temporal resolutions. In the first phase of UEM, it was possible to obtain snapshot images by using timed, single-electron packets; each packet is free of space–charge effects. Here, we demonstrate the ability to obtain sequences of snapshots ("movies") with atomic-scale spatial resolution and ultrashort temporal resolution. Specifically, it is shown that ultrafast metal–insulator phase transitions can be studied with these achieved spatial and temporal resolutions. The diffraction (atomic scale) and images (nanometer scale) we obtained manifest the structural phase transition with its characteristic hysteresis, and the time scale involved (100 fs) is now studied by directly monitoring coordinates of the atoms themselves
The Loschmidt Echo as a robust decoherence quantifier for many-body systems
We employ the Loschmidt Echo, i.e. the signal recovered after the reversal of
an evolution, to identify and quantify the processes contributing to
decoherence. This procedure, which has been extensively used in single particle
physics, is here employed in a spin ladder. The isolated chains have 1/2 spins
with XY interaction and their excitations would sustain a one-body like
propagation. One of them constitutes the controlled system S whose reversible
dynamics is degraded by the weak coupling with the uncontrolled second chain,
i.e. the environment E. The perturbative SE coupling is swept through arbitrary
combinations of XY and Ising like interactions, that contain the standard
Heisenberg and dipolar ones. Different time regimes are identified for the
Loschmidt Echo dynamics in this perturbative configuration. In particular, the
exponential decay scales as a Fermi golden rule, where the contributions of the
different SE terms are individually evaluated and analyzed. Comparisons with
previous analytical and numerical evaluations of decoherence based on the
attenuation of specific interferences, show that the Loschmidt Echo is an
advantageous decoherence quantifier at any time, regardless of the S internal
dynamics.Comment: 12 pages, 6 figure
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Nanoscale magnetic imaging of a single electron spin under ambient conditions
The detection of ensembles of spins under ambient conditions has revolutionized the biological, chemical and physical sciences through magnetic resonance imaging1 and nuclear magnetic resonance2, 3. Pushing sensing capabilities to the individual-spin level would enable unprecedented applications such as single-molecule structural imaging; however, the weak magnetic fields from single spins are undetectable by conventional far-field resonance techniques4. In recent years, there has been a considerable effort to develop nanoscale scanning magnetometers5, 6, 7, 8, which are able to measure fewer spins by bringing the sensor in close proximity to its target. The most sensitive of these magnetometers generally require low temperatures for operation, but the ability to measure under ambient conditions (standard temperature and pressure) is critical for many imaging applications, particularly in biological systems. Here we demonstrate detection and nanoscale imaging of the magnetic field from an initialized single electron spin under ambient conditions using a scanning nitrogen-vacancy magnetometer. Real-space, quantitative magnetic-field images are obtained by deterministically scanning our nitrogen-vacancy magnetometer 50 nm above a target electron spin, while measuring the local magnetic field using dynamically decoupled magnetometry protocols. We discuss how this single-spin detection enables the study of a variety of room-temperature phenomena in condensed-matter physics with an unprecedented combination of spatial resolution and spin sensitivity.Engineering and Applied SciencesPhysic
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