The phenomenon of localization of the electronic wave function in a random medium can be regarded as the key manifestation of quantum coherence in a condensed matter system. As one of the most remarkable phenomena in condensed matter physics discovered in the 20th century, the localization problem is an indispensable part of the theory of the quantum Hall effects and rivals superconductivity in its significance as a manifestation of quantum coherence at a macroscopic scale. The present volume, written by some of the leading experts in the field, is intended to highlight some of the recent progress in the field of localization, with particular emphasis on the effect of interactions on quantum coherence. The chapters are written in textbook style and should serve as a reliable and thorough introduction for advanced students or researchers already working in the field of mesoscopic physics.

The proceedings of Localisation 2011, a satellite conference of the 26th International Conference on Low Temperature Physics (LT26), comprise both invited and contributed papers that discuss the latest progress on localisation phenomena. The main topics include quantum transport in disordered systems (Anderson localisation, effects of interactions on localisation, Anderson-Mott transition, mesoscopics), the superconductor-insulator transition, quantum Hall effects (fractional and integer), topological insulators, graphene, dynamical localisation, heavy fermions (Kondo effect, Kondo lattice, effects of disorder), and many body localisation (spin-glass, Coulomb glass). The volume is also dedicated to Professor Bernard Coqblin, former CNRS Directeur de Recherche and a Honorary Chairman of the AMS-APCTP Conference Localisation 2011, whose contribution to condensed matter theory will always be remembered.