Eur. Phys. J. B (2016) 89: 1
https://doi.org/10.1140/epjb/e2015-60366-0

Regular Article

Thermoelectric transport in the topological phase due to the coexistence of superconductivity and spin-density-wave

Department of Physics, Banaras Hindu University, 221005 Varanasi, India

^a e-mail: sunnyamit31@gmail.com

Received: 7 May 2015
Received in final form: 4 November 2015
Published online: 11 January 2016

Abstract

We study the thermoelectric transport in two dimensional topological system which has coexistence of superconductivity (SC) and spin-density wave (SDW). The SC is presumed to be of d_{x² − y²} + (p_x + ip_y) type whereas the SDW order parameter is of BCS symmetry. The Hamiltonian describing such a coexistence phase is shown to have topological phase in addition to the conventional one. The transport properties in such topological system have two distinct contributions: (i) the surface/edge and (ii) the bulk. The competition between the surface/edge versus the bulk transport is analyzed in different parameter regimes and the possibility of enhancing the figure of merit is discussed.