Spontaneous Quantum Hall Effect in chiral d-density wavesP. Kotetes and G. Varelogiannis
Department of Physics, National Technical University of Athens - GR-15780 Athens, Greece, EU
received 18 July 2008; accepted in final form 22 September 2008; published November 2008
published online 29 October 2008
We study the electromagnetic response of a chiral dxy + id x2 - y2 density wave state. Due to parity () and time reversal () violation, Chern-Simons terms emerge in the effective action of the U(1) gauge field. As a consequence, electric and magnetic fields are coupled providing the possibility of observing the Spontaneous Quantum Hall Effect, i.e. the generation of Hall voltage via the sole application of an electric field. We demonstrate how the Chern-Simons terms are induced and discuss the topological origin of the quantization of the Hall conductance.
73.43.-f - Quantum Hall effects.
71.27.+a - Strongly correlated electron systems; heavy fermions.
71.45.Lr - Charge-density-wave systems.
© EPLA 2008