Frustrated Quantum Phenomena in Reduced Dimensions

C. Panagopoulos (University of Cambridge)

 

ABSTRACT: One of the most intriguing scientific problems positioned at the intersection between condensed matter physics, chemistry, and materials science, is the change of a low dimensional material from an insulator into a metal or a superconductor. Such a change does not occur as a function of temperature, but rather at absolute zero when some material parameter is tuned, and the subject belongs to the fascinating field of quantum phase transitions. The role of quantum transitions in low dimensional systems is becoming increasingly important due to the devices that are going to be used in future technologies. The continuing miniaturisation of modern devices has reached sizes of a few nanometres, where quantum mechanical effects become important, and novel material functionalities can be realised. At the same time, there have been suggestions that many of the technologically promising systems may suffer from electronic frustration and slow dynamics, which may lead to the emergence of unexpected properties. This talk will track the electronic and magnetic behaviour of a family of low dimensional magnets evolving from an insulator to a superconductor. I will demonstrate the emergence and implications of novel properties arising from the interaction between distinct ground states during this evolution.