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Spin Glasses

Criticality and Energy Landscapes

Marco Baity Jesi (Autor)

Buch | Hardcover

XXIX, 221 Seiten

2016 | 1st ed. 2016
Springer International Publishing (Verlag)
978-3-319-41230-6 (ISBN)

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This thesis addresses the surprising features of zero-temperature statics and dynamics of several spin glass models, including correlations between soft spins that arise spontaneously during avalanches, and the discovery of localized states that involve the presence of two-level systems. It also presents the only detailed historiographical research on the spin glass theory. Despite the extreme simplicity of their definition, spin glasses display a wide variety of non-trivial behaviors that are not yet fully understood. In this thesis the author sheds light on some of these, focusing on both the search for phase transitions under perturbations of Hamiltonians and the zero-temperature properties and responses to external stimuli. After introducing spin glasses and useful concepts on phase transitions and numerics, the results of two massive Monte Carlo campaigns on three-dimensional systems are presented: The first of these examines the de Almeida-Thouless transition, and proposes a new finite-size scaling ansatz, which accelerates the convergence to the thermodynamic limit. The second reconstructs the phase diagram of the Heisenberg spin glass with random exchange anisotropy.

Marco Baity Jesi achieved his bachelor and master degrees at Sapienza, University of Rome. He had the opportunity to spend one year in Paris, between the École Normale Superieure and Université Pierre et Marie Curie. For his masters thesis, a numerical study of spin glasses, he did a research stay at the Universidad Complutense de Madrid, where he collaborated with Victor Martín Mayor. This positive experience lead to a Ph.D. in cotutorship between Madrid and Rome, with Giorgio Parisi and Victor Martín Mayor as advisors. In this period he took advantage of long research stays at NYU and at Upenn. The results of these stays are partly included in his thesis manuscript. The thesis was defended at the end of the year 2015. Dr. Baity Jesi is currently in Paris, working as a postdoctoral fellow for Giulio Biroli at CEA Saclay.

Introduction.- The Ising Spin Glass in a Feld.- Heisenberg Spin Glass with Random Exchange Anisotropy.- Energy Landscape of m-component Spin Glasses.- Zero-temperature Dynamics.- Soft Modes and Localization in Spin Glasses.- Conclusions.

Erscheinungsdatum	08.10.2016
Reihe/Serie	Springer Theses
Zusatzinfo	XXIX, 221 p. 71 illus., 24 illus. in color.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Festkörperphysik
Schlagworte	Ceramics, Glass, Composites, Natural Methods • de Almeida-Thouless Transition • Finite-Size Scaling • History and Philosophical Foundations of Physics • Inherent Structure of Spin Glass • Monte Carlo Simulation of Spin Glass • Numerical and Computational Physics • Phase Transitions and Multiphase Systems • Physics and Astronomy • Quantum Information Technology, Spintronics • Review of Spin Glass Research • Soft Spin Modes in Avalanche • Spontaneous Soft Spins
ISBN-10	3-319-41230-2 / 3319412302
ISBN-13	978-3-319-41230-6 / 9783319412306
Zustand	Neuware