Two-dimensional quantum antiferromagnets

This review presents some theoretical advances in the field of quantum magnetism in two-dimensional systems, and quantum spin liquids in particular. It is to be published as a chapter in the second edition of the book "Frustrated spin systems", edited by H. T. Diep (World-Scientific). The section (Sec. 7) devoted to the kagome antiferromagnet has been completely rewritten/updated, as well as the concluding section (Sec. 8). The other sections (Secs. 1-6) are unchanged from the first edition of the book (published in 2005)Comment: 87 pages. 396 references. To be published as a chapter in the second edition of the book "Frustrated spin systems", edited by H. T. Diep (World-Scientific

Electron spin as a spectrometer of nuclear spin noise and other fluctuations

This chapter describes the relationship between low frequency noise and coherence decay of localized spins in semiconductors. Section 2 establishes a direct relationship between an arbitrary noise spectral function and spin coherence as measured by a number of pulse spin resonance sequences. Section 3 describes the electron-nuclear spin Hamiltonian, including isotropic and anisotropic hyperfine interactions, inter-nuclear dipolar interactions, and the effective Hamiltonian for nuclear-nuclear coupling mediated by the electron spin hyperfine interaction. Section 4 describes a microscopic calculation of the nuclear spin noise spectrum arising due to nuclear spin dipolar flip-flops with quasiparticle broadening included. Section 5 compares our explicit numerical results to electron spin echo decay experiments for phosphorus doped silicon in natural and nuclear spin enriched samples.Comment: Book chapter in "Electron spin resonance and related phenomena in low dimensional structures", edited by Marco Fanciulli. To be published by Springer-Verlag in the TAP series. 35 pages, 9 figure

[Review of the book \u3ci\u3eIncome Distribution in Less Developed Countries\u3c/i\u3e]

[Excerpt] This book by R. M. Sundrum, a professor at the Australian National University and former director of the World Bank, is a compilation of issues, ideas, and data on income distribution in less developed countries (LDCs). Each chapter or section has something meaningful to say, and for this reason the book bears careful study. However, no overarching theme or approach is apparent, so the reader is likely to come away with numerous small lessons about distribution and development but few larger conclusions

A charming symmetry : Pompilia's multiplicity : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts in English at Massey University

This thesis examines Pompilia's monologue in The Ring and the Book. William Walker's article " 'Pompilia' and Pompilia" notes that criticism is unified in its assessment of Pompilia's monologue despite being divergent on other issues concerning the poem. He suggests that Pompilia can be read in the same terms as the other speakers, acknowledging however, that this produces a reading which contradicts the traditional evaluation of Pompilia. Walker calls for a reading which will accommodate the discontinuities in 'Pompilia'. The discussion which follows suggests that a reading based on the premises of Romantic irony is one reading which allows for these discontinuities. Chapter One of the discussion examines criticism to date, providing a background against which my own reading of Pompilia's monologue can be placed and also being a means of evaluating Walker's own claim that criticism is unified in its assessment of Pompilia. The discussion is broken into five areas: early criticism, the Pompilia/Caponsacchi relationship, Pompilia's sainthood, her motives and her use of language. Chapter Two outlines the theory of Romantic irony which originated with German theorist Friedrich Schlegel. The discussion considers the historical development of Romantic irony noting the political, philosophical and literary movements of the time. Chapter Three consists of a detailed consideration of Pompilia's monologue. In order to address the balance which the title of this thesis suggests, this chapter concentrates on those more sophisticated aspects of Pompilia' s monologue which are not considered by most criticism surveyed in Chapter One. Section I considers the first 179 lines of Pompilia's monologue in order to provide a background and to illustrate how the monologue works as a continuous piece of narrative. Section II then considers the rest of the monologue thematically, these themes being: Pompilia's use of metaphor, her relationship with her audience, her use of irony, and her relationship with Guido and Caponsacchi. The final section of this chapter restores the balance by considering Pompilia's multiplicity and the charm which pervades her monologue. The final chapter considers Pompilia as Romantic ironist. Pompilia's fulfilment of the principles of Romantic irony is limited by her attachment to the Virgin image as is revealed in the closing lines of her monologue. The poet is seen to be embodying the tenets of Romantic irony to a greater extent than Pompilia and this is shown by a brief discussion of Books I and XII of the poem. The poet as Romantic ironist shows us that Pompilia's monologue should not be taken as the centre for truth in the poem, but rather acknowledged as part of the linguistic processes which constitute The Ring and the Book