688 research outputs found
Inhomogeneity Effects in Topological Superconductors
We have constructed a quasiclassical framework on superconductors with strong
spin-orbit couplings, applicable to CuxBi2Se3[Y. Nagai, H. Nakamura, and M.
Machida: arXiv:1305.3025]. The notable point is that in this framework the
Bogoliubov-de Gennes Hamiltonians with suggested odd-parity pairing states turn
to quasiclassical ones with usual spin-triplet Cooper pairs. Using this
quasiclassical theory, we can investigate inhomogeneity effects such as the
phenomena with vortices and surfaces in this superconductors and shed light on
the pairing state of topological superconductors. In this paper, we apply the
quasiclassical framework to the surface bound states with the Dirac-cone energy
dispersion originated from the topological invariant in the parent compound
Bi2Se3 in order to investigate the robustness of these bound states under the
superconducting order parameter. The odd-parity gap functions can not open on
the Dirac-cone-dispersion band in the Cu-doped BiSe superconductor.
We show that the massless Dirac quasiparticles originated from the normal-state
topological invariant and the Majorana quasiparticles coexist with each other
on the surface in the odd-parity topological superconductivity. Inhomogeneity
effects can be easily investigated with the use of our quasiclassical framework
in topological superconductors.Comment: 6 pages, 2 figures, submitted to SCES 2013 proceeding
Molecular Precursor Method for Fabricating p-Type Cu2O and Metallic Cu Thin Films
Functional thin films are used in various fields of our life. Many different methods are used to fabricate these films including physical vapor deposition (PVD) and chemical processes. The chemical processes can be used to manufacture thin films in a relatively cheap way, as compared to PVD methods. This chapter summarizes the procedures of the molecular precursor method (MPM), a chemical process, for fabrication of both metal oxide semiconductor Cu2O and metallic Cu thin films by utilizing Cu(II) complexes in coating solutions. The MPM, recently developed and reported by the present authors, represents a facile procedure for thin film fabrication of various metal oxides or phosphates. This method pertinent to the coordination chemistry and materials science including nanoscience and nanotechnology has provided various thin films of high quality. The MPM is based on the design of metal complexes in coating solutions with excellent stability, homogeneity, miscibility, coatability, etc., which are practical advantages. The metal oxides and phosphates are useful as the electron and/or ion conductors, semiconductors, dielectric materials, etc. This chapter will describe the principle and recent achievement, mainly on fabricating the p-type Cu2O and metallic Cu thin films of the MPM
Cis-Cotranscription of Two Beta Globin Genes during Chicken Primitive Hematopoiesis
Chicken beta globin locus contains four genes, two of which, rho and epsilon, are expressed from the earliest stage of primitive hematopoiesis. Here we show that the transcription of these two genes in the nucleus engages in “on/off” phases. During each “on” phase, cotranscription of rho and epsilon in cis is favored. We propose that these two chicken beta globin genes are transcribed not by competing for a transcription initiation complex, but in a cooperative way
Highly Functionalized Lithium-Ion Battery
Future energy demand is an important issue that requires consideration. Lithium-ion batteries (LIB) are one of the most popular types of rechargeable battery for portable electronic devices, such as mobile phones, cameras, and laptop computers, and have led to other applications being commercialized. Distributed power generation using renewable energy sources, such as solar photovoltaic (PV), can efficiently supply electricity according to on-site demand. If the electrodes of a LIB could function as a solar cell, the storage device could provide electricity without an electric power supply
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