Macroscopic Quantum Phenomena

Philip R. Wallace

J. Q. You

Terence William Barrett

Y. Leblanc

A. O. Caldeira

Reviewing macroscopic quantum phenomena and quantum dissipation, from the phenomenology of magnetism and superconductivity to the presentation of alternative models for quantum dissipation, this book develops the basic material necessary to understand the quantum dynamics of macroscopic variables. Macroscopic quantum phenomena are presented through several examples in magnetism and superconductivity, developed from general phenomenological approaches to each area. Dissipation naturally plays an important role in these phenomena, and therefore semi-empirical models for quantum dissipation are introduced and applied to the study of a few important quantum mechanical effects. The book also discusses the relevance of macroscopic quantum phenomena to the control of meso- or nanoscopic devices, particularly those with potential applications in quantum computation or quantum information. It is ideal for graduate students and researchers.

John H. Miller

Superconductivity and related macroscopic quantum phenomena John H. Miller, Jr., from the University of Houston, Dept. of Physics and Texas Center for Superconductivity, walks us through superconductivity and related macroscopic quantum phenomena. Quantum behavior applies not only to microscopic but also to macroscopic systems. Spin-½ particles, fermions, obey the Pauli Exclusion Principle, whereby no two can occupy the same quantum state. By contrast, many integer-spin particles, bosons, can condense into a single macroscopic state. In a superconductor (1), below its critical temperature or Tc , electrons condense into an electronic superfluid that flows with no resistance. For electrons (spin- ½) to condense, they must form pairs. There is one problem, however. Electrons normally repel each other.