Browsing Physics by Sponsor "National Science Foundation"
Now showing items 1-12 of 12
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Comprehenisive characterization of molecular interactions based on nanomechanics
(2008)Molecular interaction is a key concept in our understanding of the biological mechanisms of life. Two physical properties change when one molecular partner binds to another. Firstly, the masses combine and secondly, the ... -
Effect of epitaxial strain on the spontaneous polarization of thin film ferroelectrics
(American Physical Society, 2005)Epitaxial strain can substantially enhance the spontaneous polarizations and Curie temperatures of ferroelectric thin films compared to the corresponding bulk materials. In this Letter we use first principles calculations ... -
Experimental and computational investigation of structure and magnetism in pyrite Co1-xFexS2: Chemical bonding and half-metallicity
(American Physical Society, 2004)Bulk samples of the pyrite chalcogenide solid solutions Co1?xFexS2 s0?x?0.5d, have been prepared and their crystal structures and magnetic properties studied by x-ray diffraction and SQUID magnetization measurements. Across ... -
First principles study of the multiferroics BiFeO3, Bi2FeCrO6, and BiCrO3: Structure, polarization, and magnetic ordering temperature
(American Physical Society, 2005)We present results of an ab initio density-functional theory study of three bismuth-based multiferroics, BiFeO3, Bi2FeCrO6, and BiCrO3. We disuss differences in the crystal and electronic structure of the three systems and ... -
First-principles study of spontaneous polarization in multiferroic BiFeO3
(American Physical Society, 2005)The ground-state structural and electronic properties of ferroelectric BiFeO3 are calculated using density functional theory within the local spin-density approximation (LSDA) and the LSDA + U method. The crystal structure ... -
RealTime Mass Sensing by Nanomechanical Resonatorsin Fluid
(2004)We have developed a sensitive method for real-time mass sensing in a fluid using a microfabricated array of nanomechanical cantilevers actuated at their resonance frequencies. The sensor platform consists of a streptavidin ... -
VirE2: A Unique ssDNA Compacting Molecular Machine
(2008)The translocation of single-stranded DNA (ssDNA) across membranes of two cells is a fundamental biological process occurring in both bacterial conjugation and Agrobacterium pathogenesis. Whereas bacterial conjugation spreads ... -
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(American Astronomical Society, 2006)The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for ... -
Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
(American Physical Society, 2005)We analyze the coupling between the ferroelectric and magnetic order parameters in the magnetoelectric multiferroic BiFeO3 using density functional theory within the local spin density approximation (LSDA) and the LSDA+U ...