Enhanced diamagnetism and Nernst signal from a chiral d-density wave state in the pseudogap regime of the cuprates

In this paper we propose an alternative explanation for the pseudogap regime of the cuprate superconductors. Specifically, a solution to this puzzle can be provided by associating at least a part of the pseudogap regime with a chiral dxy +idx2-y2 density wave. As we demonstrate for the first time, violation of parity and time reversal from this unconventional density wave gives rise to the Topological Meissner effect and the concomitant Anomalous Nernst effect. As a matter of fact, the enhanced diamagnetism and Nerst signal, recently observed in the cuprates, could be simultaneously explained in terms of a chiral d-density wave.