Electron beams of cylindrically symmetric spin polarization

Cylindrically symmetric electron beams in spin polarization are reported for the first time. They are shown to be the eigen states of total angular momentum in the $z$ direction. But they are neither the eigen states of spin nor the eigen states of orbital angular momentum in that direction.Comment: 10 pages and 2 figure

Controllable Goos-H\"{a}nchen shifts and spin beam splitter for ballistic electrons in a parabolic quantum well under a uniform magnetic field

The quantum Goos-H\"{a}nchen shift for ballistic electrons is investigated in a parabolic potential well under a uniform vertical magnetic field. It is found that the Goos-H\"{a}nchen shift can be negative as well as positive, and becomes zero at transmission resonances. The beam shift depends not only on the incident energy and incidence angle, but also on the magnetic field and Landau quantum number. Based on these phenomena, we propose an alternative way to realize the spin beam splitter in the proposed spintronic device, which can completely separate spin-up and spin-down electron beams by negative and positive Goos-H\"{a}nchen shifts.Comment: 6 pages, 6 figure

Tetra­pyridine­bis(trichloro­acetato)nickel(II)

The title compound, [Ni(C2Cl3O2)2(C5H5N)4], was prepared by the reaction of pyridine and trichloro­acetatonickel(II) in ethanol solution at room temperature. The NiII atom is located on a twofold rotation axis and has a slightly distorted octa­hedral coordination made up of four N atoms of the pyridine ligands and two O atoms of trichloro­acetate anions. The mol­ecular structure and packing are stabilized by intra- and inter­molecular C—H⋯O hydrogen-bonding inter­actions