Atomic spin decoherence near conducting and superconducting films

Published versio

Recent Cases: Taxation — Intangible Property Tax on Corporate Stock — Status of Corporations Domesticated in Nebraska

An intangible property tax was assessed upon shares of stock held by plaintiff, executor, in four domesticated corporations. Plaintiff, in an action to enjoin the county treasurer from collecting the tax, contended that section 77-706 of the Nebraska Statutes, providing that intangible property taxes should be assessed against the corporation rather than its stockholders, applies to domesticated as well as domestic corporations, and, therefore, the shares should not be taxed to the stockholders. Held: by a divided court, the stock of a domesticated corporation is to be valued for taxation purposes as stock of a foreign corporation under the provisions of section 77-722, therefore the tax is assessed against the individual stockholders. Subsequent to this decision, the Nebraska Legislature amended section 77-706 to provide that the intangible tax on shares of stock in domesticated corporations, as well as that in domestic corporations, should be assessed against the corporation rather than its stockholders. Therefore the future effect of the instant decision is overruled. However, under a Nebraska statute, these stockholders will be liable for the amount of taxes which they should, under the instant ruling, have paid during the last three years

Bills and Notes — Negotiability by Contract Under the Uniform Commercial Code

Negotiability by contract is nothing more than a phrase used to denote an attempt to create the effects of negotiability on non-negotiable contracts. The usual provision found to impart such negotiability is an agreement in an otherwise non-negotiable contract that the obligor will not assert defenses of fraud, duress, mistake, lack of consideration, failure of consideration, or any other defense against a bona fide assignee of the contract. There would seem to be no reason why the attributes of negotiability should not be added to otherwise non-negotiable contracts so long as the parties have clearly expressed their intention that the contract will have such an effect, and that such agreed stipulation is not contrary to any public policy or is in itself illegal. The Existing Law of Negotiability by Contract … Code Provisions in General … Application and Effect of Code Provisions … Conclusion

Measurement of the lowest millimetre-wave transition frequency of the CH radical

The CH radical offers a sensitive way to test the hypothesis that fundamental constants measured on earth may differ from those observed in other parts of the universe. The starting point for such a comparison is to have accurate laboratory frequencies. Here we measure the frequency of the lowest millimetre-wave transition of CH, near 535 GHz, with an accuracy of 0.6 kHz. This improves the uncertainty by roughly two orders of magnitude over previous determinations and opens the way for sensitive new tests of varying constants.Comment: 5 pages, 5 figure

A Sawtooth Permanent Magnetic Lattice for Ultracold Atoms and BECs

We propose a new permanent magnetic lattice for creating periodic arrays of Ioffe-Pritchard permanent magnetic microtraps for holding and controlling ultracold atoms and Bose-Einstein condensates (BECs). Lattice can be designed on thin layer of magnetic films such as $Tb_6$$Gd_10$$Fe_{80}$$Co_4$. In details, we investigate single layer and two crossed layers of sawtooth magnetic patterns with thicknesses of 50 and 500nm respectively with a periodicity of 1$\mu$m. Trap depth and frequencies can be changed via an applied bias field to handle tunneling rates between lattice sites. We present analytical expressions and using numerical calculations show that this lattice has non-zero potential minima to avoid majorana spin flips. One advantage of this lattice over previous ones is that it is easier to manufacture.Comment: 8 pages, 6 figure

On the feasibility of studying vortex noise in 2D superconductors with cold atoms

We investigate the feasibility of using ultracold neutral atoms trapped near a thin superconductor to study vortex noise close to the Kosterlitz-Thouless-Berezinskii transition temperature. Alkali atoms such as rubidium probe the magnetic field produced by the vortices. We show that the relaxation time $T_1$ of the Zeeman sublevel populations can be conveniently adjusted to provide long observation times. We also show that the transverse relaxation times $T_2$ for Zeeman coherences are ideal for studying the vortex noise. We briefly consider the motion of atom clouds held close to the surface as a method for monitoring the vortex motion.Comment: 4 pages, 1 figur