Engineering p-wave interactions in ultracold atoms using nanoplasmonic traps.

Engineering strong p-wave interactions between fermions is one of the challenges in modern quantum physics. Such interactions are responsible for a plethora of fascinating quantum phenomena, such as topological quantum liquids and exotic superconductors. Here we propose a method to generate these fermionic interactions by combining recent developments in nanoplasmonics with progress in realizing laser-induced gauge fields. Nanoplasmonics allows for strong confinement, leading to a geometric resonance in the atom-atom scattering. In combination with the laser coupling of the atomic states, this is shown to result in the desired interaction. We illustrate how this scheme can be used for the stabilization of strongly correlated fractional quantum Hall states in ultracold fermionic gases.

Spontaneous time-reversal symmetry breaking for spinless fermions on a triangular lattice.

As a minimal fermionic model with kinetic frustration, we study a system of spinless fermions in the lowest band of a triangular lattice with nearest-neighbor repulsion. We find that the combination of interactions and kinetic frustration leads to spontaneous symmetry breaking in various ways. Time-reversal symmetry can be broken by two types of loop current patterns, a chiral one and one that breaks the translational lattice symmetry. Moreover, the translational symmetry can also be broken by a density wave forming a kagome pattern or by a Peierls-type trimerization characterized by enhanced correlations among the sites of certain triangular plaquettes (giving a plaquette-centered density wave). We map out the phase diagram as it results from leading-order Ginzburg-Landau mean-field theory. Several experimental realizations of the type of system under study are possible with ultracold atoms in optical lattices.

Coupling nanomechanical cantilevers to dipolar molecules.

We investigate the coupling of a nanomechanical oscillator in the quantum regime with molecular (electric) dipoles. We find theoretically that the cantilever can produce single-mode squeezing of the center-of-mass motion of an isolated trapped molecule and two-mode squeezing of the phonons of an array of molecules. This work opens up the possibility of manipulating dipolar crystals, which have been recently proposed as quantum memory, and more generally, is indicative of the promise of nanoscale cantilevers for the quantum detection and control of atomic and molecular systems.

Fermionic stabilization and density-wave ground state of a polar condensate.

We examine the stability of a trapped dipolar condensate mixed with a single-component fermion gas at T=0. Whereas pure dipolar condensates with a small s-wave interaction are unstable even at small dipole-dipole interaction strength, we find that the admixture of fermions can significantly stabilize them, depending on the strength of the boson-fermion interaction. Within the stable regime we find a region where a ground state is characterized by a density wave along the soft trap direction.

Projection of lactation milk yield from part records in crossbred dairy cows.

First lactation records of a total of 242 Jersey (JH), Brown Swiss (BH) and Holstein-Friesian (FH) halfbreeds from Hariana cows were studied for projecting 300 d milk yield from 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38 and 40 weeks' milk yield. The correlation coefficients between 300 d milk yield and part records ranged from 0.84 to 0.9 in the JH, 0.80 to 0.90 in the BH and 0.72 to 0.86 in the FH groups. Prediction equations and standard errors of estimation for prediction of 300 d milk yield for an individual animal are presented. It is suggested that part records up to 16, 22 and 22 weeks may be used for projecting 300 d yield with sufficient accuracy in the JH, BH and FH groups respectively.

Factors affecting lamb survival in crossbred sheep.

Survival from birth to 1 month, 1 month to weaning, weaning to 1 year and birth to 1 year was studied in crosses of native carpet wool breeds (Chokla, Malpura and Jaisalmeri) with Rambouillet. Least-squares analysis of data considering survival as 1 and mortality as 0, showed that the year and season of birth affected survival significantly during all age periods except from birth to 1 month and from 1 month to weaning where season had no significant effect. Sex (studied only for pre-weaning survival), ewe's weight at lambing and birth weight of lamb did not influence survival except that the ewe's weight a significant influence on survival from 1 month to weaning. Genetic groups did not differ significantly. Rambouillet X Malpura F1s had a higher survival rate than the other 2 F1s. There was a non-significant decline in survival with an increase in Rambouillet inheritance, except that 5/8 Rambouillet -3/8 Chola crossbreds had a slightly higher survival rate than Rambouillet X Chokla F1s. Interbreeding F1 and 3/4 crossbreds did not result in any significant decline in survival. The results show that the introduction of exotic fine-wool inheritance up to 50% and interbreeding of halfbreds will not result in any decline in survival.