



01551nas a2200193   4500008004100000245008200041210006900123260001300192490000800205520096600213100002501179700002701204700001501231700001201246700001901258700002301277700002001300856003701320       2011                        eng d00aTunable Superfluidity and Quantum Magnetism with Ultracold Polar  Molecules
0 aTunable Superfluidity and Quantum Magnetism with Ultracold Polar  c2011/9/80 v1073 a  By selecting two dressed rotational states of ultracold polar molecules in an
optical lattice, we obtain a highly tunable generalization of the t-J model,
which we refer to as the t-J-V-W model. In addition to XXZ spin exchange, the
model features density-density interactions and novel density-spin
interactions; all interactions are dipolar. We show that full control of all
interaction parameters in both magnitude and sign can be achieved independently
of each other and of the tunneling. As a first step towards demonstrating the
potential of the system, we apply the density matrix renormalization group
method (DMRG) to obtain the 1D phase diagram of the simplest experimentally
realizable case. Specifically, we show that the tunability and the long-range
nature of the interactions in the t-J-V-W model enable enhanced superfluidity.
Finally, we show that Bloch oscillations in a tilted lattice can be used to
probe the phase diagram experimentally.
1 aGorshkov, Alexey, V.1 aManmana, Salvatore, R.1 aChen, Gang1 aYe, Jun1 aDemler, Eugene1 aLukin, Mikhail, D.1 aRey, Ana, Maria  uhttp://arxiv.org/abs/1106.1644v1