Abstract

Before 1986 it was generally believed that ceramic oxides are poorconductors for electrical conduction. Against this perception asurprise appeared in late 1986 by Bednorz and Müller, who showed thata doped ceramic cuprate becomes a high temperature superconductor. Nowwe find several dozens of high Tc superconductors and they are allceramic perovskites. Although a large volume of literature exists onvarious aspect of high Tc materials, yet we are far from understandingthe real mystery- how these ceramic materials superconduct? In thistalk I present an appraisal of variety of observed anomalies anddiscuss what do these anomalies indicate towards the microscopicmechanism of superconducting pairing?

Abstract

Ageing phenomenon is observed in slowly relaxing nonequilibrium systems.Examples not only include complex glassy systems, but also simplestatistical mechanics systems when rapidly quenched in temperature.These quenched systems usually show scaling properties and universalbehaviour while ageing. I shall give an elementary introduction anddiscuss what an ageing state is, how we try to describe and monitor it,and to what extent it can carry a memory.

Abstract

Abstract

We will discuss the entanglement in a two-qubit systemdynamically generated by the interaction of the qubit system with itsenvironment (bath or reservoir). The interactions considered would beboth of the purely dephasing, no energy exchange, as well as dissipative, dephasing accompanied with dissipation.An introduction is provided tothe concept of entanglement as well as Open Quantum Systems. Sinceinteraction with the environment makes the system mixed, we discuss indetail the measure of entanglement called concurrence as well as arecently introduced description of mixed state entanglement usingprobability density function.

Abstract