Rational design of novel thallium halide high T$_c$ superconductors from first-principles

Searching for new high-temperature superconductors remains one of the most active research areas in condensed matter physics and material physics. In this talk I will show how we designed, from first principles calculations, a novel family of thallium halide-based compounds as candidates for new high-temperature superconductors. This family together with the celebrated (Ba,K)BiO$_3$ and electron-doped HfNCl families are the ``other high-temperature supercondutors,'' whose superconductivity is mediated by the recently proposed mechanism of non-local correlation-enhanced strong electron-phonon coupling (arXiv:1110.5751). Two prototype compounds namely CsTlF$_3$ and CsTlCl$_3$ are studied with various hole doping levels and volumes. The critical superconducting temperature T$_c$ are predicted to be about 30 K and 20 K with optimal hole doping and volume, respectively. Our procedure of designing this class of superconductors is quite general and can be used to search for other ``other high temperature superconductors.''