المؤلفون: Z. Y. Tian, Q. Y. Zhang, Y. W. Xiao, G. A. Gamage, F. Tian, S. Yue, V. G. Hadjiev, Jiming Bao, Zhifeng Ren, Erjun Liang, Jimin Zhao

المصدر: Physical Review B. 105

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c8d6ca7a585f2ea3539b9c58698a146eTest
https://doi.org/10.1103/physrevb.105.174306Test

المؤلفون: K. W. Lin, F. Jona, Y. Tian

المصدر: Physical Review B. 62:12844-12848

مصطلحات موضوعية: Surface (mathematics), Materials science, Optics, Reflection high-energy electron diffraction, Electron diffraction, Condensed matter physics, Low-energy electron diffraction, Gas electron diffraction, business.industry, Relaxation (physics), Selected area diffraction, business, Electron backscatter diffraction

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::870ba7c042d07ee3040206a9142fdf18Test
https://doi.org/10.1103/physrevb.62.12844Test

المؤلفون: F. Jona, J. Quinn, Y. Tian, Ko-Wei Lin

المصدر: Physical Review B. 61:4904-4909

مصطلحات موضوعية: Materials science, Optics, Reflection high-energy electron diffraction, Gas electron diffraction, business.industry, Selected area diffraction, business, Electron backscatter diffraction

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::167f1a4de6340a94971835fd4e4cfe88Test
https://doi.org/10.1103/physrevb.61.4904Test

المؤلفون: P. M. Marcus, Y. Tian, F. Jona

المصدر: Physical Review B. 59:12647-12651

مصطلحات موضوعية: Optics, Materials science, Reflection high-energy electron diffraction, business.industry, Analytical chemistry, business, Electron backscatter diffraction

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::a07ba1206e71aed97f86142440630d0dTest
https://doi.org/10.1103/physrevb.59.12647Test

المؤلفون: P. M. Marcus, Y. Tian, F. Jona

المصدر: Physical Review B. 59:12286-12289

مصطلحات موضوعية: Tetragonal crystal system, Materials science, Reflection high-energy electron diffraction, Condensed matter physics, chemistry, Phase (matter), Metastability, Vanadium, chemistry.chemical_element, Atomic physics, Electron backscatter diffraction

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b7ec4938514415b790ef07252310af39Test
https://doi.org/10.1103/physrevb.59.12286Test

المؤلفون: P. M. Marcus, Y. Tian, F. Jona

المصدر: Physical Review B. 58:14051-14055

مصطلحات موضوعية: Reflection high-energy electron diffraction, Materials science, Gas electron diffraction, business.industry, Analytical chemistry, Vanadium, chemistry.chemical_element, Substrate (electronics), Epitaxy, Optics, chemistry, Electron diffraction, Phase (matter), business, Electron backscatter diffraction

الوصف: The epitaxial Bain path for vanadium, calculated by first-principles theory, reveals the existence of a metastable body-centered-tetragonal (bct) phase with $c/a=1.78.$ Experiments aimed at stabilizing this phase by pseudomorphic epitaxy on a Ni{001} substrate were successful insofar as the ultrathin films grown have a bct structure with $c/a$ between 1.73 and 1.77. The bulk structure of the V films was determined by quantitative low-energy electron diffraction, but the accuracy of the results is worse than usual owing to high densities of defects in the grown films.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::6955a6dd0a70e68e9830948778170000Test
https://doi.org/10.1103/physrevb.58.14051Test

المؤلفون: Y. Tian, P. M. Marcus, S. K. Kim, F. Jona

المصدر: Physical Review B. 56:9858-9863

مصطلحات موضوعية: Surface (mathematics), Diffraction, Planar, Reflection high-energy electron diffraction, Materials science, Electron diffraction, Condensed matter physics, Gas electron diffraction, Alloy, engineering, engineering.material, Atomic physics, Electron backscatter diffraction

الوصف: The atomic structure of a {110} surface of the ordered binary alloy FeRh is studied with quantitative low-energy electron diffraction. The structure of a surface with stoichiometric composition is found to be bulklike $(1\ifmmode\times\else\texttimes\fi{}1),$ but with a pronounced buckling, the Fe subplane being raised 0.15 \AA{} over the Rh subplane of the first layer, and the first interlayer spacing, measured from the Rh subplane of the first to the (bulklike and planar) second atomic layer, is contracted by 0.05 \AA{} (2.4%). Nonstoichiometric (probably Fe-poor) islands are found to have a reconstruction that may be labeled $3\ifmmode\times\else\texttimes\fi{}1$ when referred to the oblique unit mesh of FeRh{110}, but whose structure is unknown. A relation between specimen size and angular diffraction width is derived.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::6b3f226479ee71973db8f8fbb85f62cdTest
https://doi.org/10.1103/physrevb.56.9858Test

المؤلفون: M. Montesano, F. Jona, P. M. Marcus, S. K. Kim, Y. Tian

المصدر: Physical Review B. 54:5081-5085

مصطلحات موضوعية: Materials science, Axial ratio, business.industry, Grown film, Epitaxy, Poisson's ratio, symbols.namesake, Crystallography, Tetragonal crystal system, Optics, Electron diffraction, Lattice (order), symbols, Van der Waals radius, business

الوصف: Ultrathin films of Mn grow epitaxially and pseudomorphically on Fe{001}. Low-energy electron diffraction (LEED) experiments show that with increasing thickness the films contain defects and disorder, but a substantial portion remains well crystallized. A quantitative LEED analysis of a 23-\AA{}-thick film finds that the film has a body-centered-tetragonal structure with lattice parameters: a=2.866 \AA{} and c=3.228 \AA{}, hence with an axial ratio c/a=1.13 and atomic volume 13.3 A${\mathrm{\r{}}}^{3}$/atom. Strain analysis using both the LEED results and the tetragonal structure from dilute Mn alloys determines the Poisson ratio of the film to be near 0.5, hence the film is elastically soft. Both the face-centered- and the body-centered-cubic structures are consistent with the data as underlying phases of the grown film. LEED intensity data show that the distance between Mn layers is small (about 1.3 \AA{}) when the epitaxial film is only two- or three-layers thick, and then increases to become 1.614 \AA{} in the bulk of 14-layer thick films. \textcopyright{} 1996 The American Physical Society.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63305dafcaea656b925431d9cf236f58Test
https://doi.org/10.1103/physrevb.54.5081Test

المؤلفون: Kung-Sik Chan, H. Y. Tian, Jing Wang

المصدر: Physical Review B. 86

مصطلحات موضوعية: Materials science, Spintronics, Condensed matter physics, Graphene, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, law.invention, Magnetization, Ferromagnetism, law, Electron optics, Proximity effect (audio), Graphene nanoribbons, Spin-½

الوصف: We investigate theoretically spin injection efficiency from the ferromagnetic graphene to normal graphene (FG/NG) based on electron optics, where the magnetization in the FG is assumed from the magnetic proximity effect. Based on a graphene lattice model, we demonstrated that one spin-species electron flow from a point source could be nearly suppressed through the FG-NG interface, when the total internal reflection effect occurs with the help of an additional barrier masking the Klein tunneling, while the opposite spin-species electron flow could even be collimated due to the negative refraction under suitable parameters. Not only at the focusing point is the efficient spin injection achieved, but in the whole NG region the spin injection efficiency can also be maintained at a high level. It is also shown that the nonideal FG-NG interface could reduce the spin injection efficiency since the electron optics phenomena are weakened owing to the interfacial backscattering. Our findings may shed light on making graphene-based spin devices in the spintronics field.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d3e278de45fef2349444746ae2fc7341Test
https://doi.org/10.1103/physrevb.86.245413Test

المؤلفون: Jing Wang, Kung-Sik Chan, Y. H. Yang, H. Y. Tian

المصدر: Physical Review B. 86

مصطلحات موضوعية: Materials science, Condensed matter physics, Spintronics, Graphene, Spin–orbit interaction, Electron, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, Zigzag, law, Condensed Matter::Strongly Correlated Electrons, Graphene nanoribbons, Spin-½

الوصف: We propose an approach to detect spin currents in an even zigzag graphene nanoribbon (ZR) junction, based on the peculiar intervalley selection rule in the ribbon when only zero-energy modes are involved in transport. Spatial spin separation arises from the bipolar property of the undoped ZR and opposite pseudoparities of electrons in the conduction and valence bands, and does not involve any magnetic field or spin orbit interaction. A measurable fully spin-polarized charge current or potential can thus be converted from either coherent or incoherent spin resources. Our findings may shed light on making spintronics devices based on graphene nanoribbons.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b47762c12e34adc08580af3fd00d773fTest
https://doi.org/10.1103/physrevb.86.081404Test