Driven impurity in an ultracold 1D Bose gas with intermediate interaction strength
Physical Review A: Atomic, Molecular and Optical Physics American Physical Society 93:1 (2016) 013613
Abstract:
We study a single impurity driven by a constant force through a one-dimensional Bose gas using a LiebLiniger based approach. Our calculaton is exact in the interaction amongst the particles in the Bose gas, and is perturbative in the interaction between the gas and the impurity. In contrast to previous studies of this problem, we are able to handle arbitrary interaction strength for the Bose gas. We find very good agreement with recent experiments [Phys. Rev. Lett. 103, 150601 (2009)].Mobile impurity approach to the optical conductivity in the Hubbard chain
Physical Review B American Physical Society 93:20 (2016) 205101
Abstract:
We consider the optical conductivity in the one dimensional Hubbard model in the metallic phase close to half filling. In this regime most of the spectral weight is located at frequencies above an energy scale Eopt that tends towards the optical gap in the Mott insulating phase for vanishing doping. Using the Bethe Ansatz we relate Eopt to thresholds of particular kinds of excitations in the Hubbard model. We then employ a mobile impurity models to analyze the optical conductivity for frequencies slightly above these thresholds. This entails generalizing mobile impurity models to excited states that are not highest weight with regards to the SU(2) symmetries of the Hubbard chain, and that occur at a maximum of the impurity dispersion.Order and disorder in SU(N) simplex solid antiferromagnets
Journal of Statistical Mechanics Theory and Experiment IOP Publishing 2016:1 (2016) 013105
Order by disorder and by doping in quantum Hall valley ferromagnets
Physical Review B American Physical Society (APS) 93:1 (2016) 014442
Precision control of DNA-based molecular reactions
Institution of Engineering and Technology (IET) (2016) 1 .-1 .