טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentLindner Netanel
SubjectTransport of Interacting Bosons on 2D Lattices
DepartmentDepartment of Physics
Supervisor Professor Assa Auerbach
Full Thesis textFull thesis text - English Version


Abstract

We study transport in the ''normal'' resistive state of strongly interacting lattice bosons in two dimensions, a regime we find to be characterized by unconventional transport properties. We focus on a model of lattice bosons with hard-core interactions at half  filling, and employ non perturbative tools of quantum magnetism. We find a large temperature range with linearly increasing resistivity and broad dynamical conductivity which cannot be explained by the conventional theoretical paradigms of Fermi and Bose gases. In the superfluid phase at zero temperature, we find a high frequency peak in the dynamical conductivity, which corresponds to order parameter magnitude fluctuations. The quantum dynamics of vortices in the model are also studied. We find a light vortex mass, and predict a quantum vortex liquid phase at low vortex densities. At half-filling we find doublet degeneracies associated with the charge ordering in the vortex cores. The Hall conductivity reverses sign abruptly as the density crosses half filling, where its characteristic temperature scale vanishes. Experimental implications of our results are discussed, including a comparison to transport measurements in unconventional superconductors such as the cuprates.