Antiferromagnetism and superfluidity of a dipolar Fermi gas in a 2D optical lattice

In a dipolar Fermi gas, the dipole-dipole interaction between fermions can be turned into a dipolar Ising interaction between pseduospins in the presence of an AC electric field. When trapped in a 2D optical lattice, such a dipolar Fermi gas has a very rich phase diagram at zero temperature, due to the competition between antiferromagnetism and superfluidity. At half filling, the antiferromagnetic state is the favored ground state. The superfluid state appears as the ground state at a smaller filling factor. In between there is a phase-separated region. The order parameter of the superfluid state can display different symmetries depending on the filling factor and interaction strength, including d-wave ($d$), extend s-wave ($xs$), or their linear combination ($xs+i\times d$). The implication for the current experiment is discussed.Comment: 11 pages, 3 figures, references update

The Turn-Of-The-Month Effect In The S&P 500 (2001-2011)

This paper investigates if theturn-of-the-month effect exists in the broad US equity market from January 2001to December 2011 and if applying the knowledge of the “turn-of-the-month”effect to move the dates of investment without engaging active tradingstrategies can improve the investment performance during the same period oftime. We find that the turn-of-the-month effect still exists, but its occurrencehas moved to earlier dates. We also find that investment made on days beforethe turn-of-the-month performs better than those made during theturn-of-the-month. Simple time diversification strategy of spreading investmentthroughout the month, which doesn’t require a perfect foresight, is also foundto generate a better performance