Spontaneous persistent currents in a quantum spin Hall insulator

We present a mechanism for persistent charge current. Quantum spin Hall insulators hold dissipationless spin currents in their edges so that, for a given spin orientation, a net charge current flows which is exactly compensated by the counterflow of the opposite spin. Here we show that ferromagnetic order in the edge upgrades the spin currents into persistent charge currents without applied fields. For that matter, we study the Hubbard model including Haldane-Kane-Mele spin-orbit coupling in a zigzag ribbon and consider the case of graphene. We find three electronic phases with magnetic edges that carry currents reaching 0.4 nA, comparable to persistent currents in metallic rings, for the small spin-orbit coupling in graphene. One of the phases is a valley half metal.

Water-triggered spontaneous surface patterning in thin films of mexylaminotriazine molecular glasses

Surface patterning that occurs spontaneously during the formation of a thin film is a powerful tool for controlling film morphology at the nanoscale level because it avoids the need for further processing. However, one must first learn under which conditions these patterning phenomena occur or not, and how to achieve control over the surface morphologies that are generated. Mexylaminotriazine-based molecular glasses are small molecules that can readily form amorphous thin films. It was discovered that this class of materials can either form smooth films, or films exhibiting either dome or pore patterns. Depending on the conditions, these patterns can be selectively obtained during film deposition by spin-coating. It was determined that this behavior is controlled by the presence of water or, more generally, of a solvent in which the compounds are insoluble, and that the relative amount and volatility of this poor solvent determines which type of surface relief is obtained. Moreover, AFM and FT-IR spectroscopy have revealed that the thin films are amorphous independently of surface morphology, and no difference was observed at the molecular or supramolecular level. These findings make this class of materials and this patterning approach in general extremely appealing for the control of surface morphology with organic nanostructures.

Abortion surveillance /

Description based on: 1976.

A study of spontaneous ignition of metals /

This report describes a study of the reactions occurring in the spontaneous ignition of zirconium and titanium (and their alloys), with emphasis on the former. Conditions required for spontaneous ignition, including the effects of certain impurities, surface conditions, and composition of the atmosphere around the metal were investigated. In addition, the mechanism of ignition was studied by following the thermal history of the reactions during the first few milliseconds.

Report of the Departmental Committee appointed by the Board of Agriculture and Fisheries to inquire into epizootic abortion ... [with Minutes of evidence and appendices]

Mode of access: Internet.

First report of the Departmental Committee on Spontaneous Combustion of Coal in Mines.

Disbound Original Held in Oak Street Library Facility.

Plain speaking : a theory and grammar of spontaneous discourse /

Mode of access: Internet.

Studies in vaccinal immunity towards disease of the bovine placenta due to bacillus abortus (infectious abortion) /

"November 15, 1923"--Cover.

A study of infectious abortion in cattle,

Reprinted from: Cornell University. New York State Veterinary College. Annual report, 1912/13, p.82-114.

Laboratory diagnosis of abortion in food animals : a special report /

Imprint stamped on t.p.

Illinois abortion statistics /

Published pursuant to the Illinois Abortion Law of 1975 (720 ILCS 510/10) which stipulates that a report be submitted annually to the Illinois General Assembly.

Pure sociology; a treatise on the origin and spontaneous development of society,

Mode of access: Internet.

Spontaneous hypertension, its pathogenesis and complications : proceedings of the 2d International Symposium on the Spontaneously Hypertensive Rat /

Mode of access: Internet.

Abortion in cows,

p. 57, advertising matter.