DYNAMICAL PROPERTIES OF MANY--BODY SYSTEMS FROM CONFIGURATIONAL AND DETERMINANTAL QUANTUM MONTE CARLO METHODS.
Tesi di Dottorato
Data di Pubblicazione:
2015
Citazione:
DYNAMICAL PROPERTIES OF MANY--BODY SYSTEMS FROM CONFIGURATIONAL AND DETERMINANTAL QUANTUM MONTE CARLO METHODS / M. Motta ; supervisore: D. E. Galli ; co-supervisore: L. G. A. Molinari. DIPARTIMENTO DI FISICA, 2015 Nov 27. 28. ciclo, Anno Accademico 2015. [10.13130/motta-mario_phd2015-11-27].
Abstract:
The numerical simulation of quantum many-body systems is an essential instrument in the research on condensed matter Physics.
Recent years have witnessed remarkable progress in studying dynamical properties of non-relativistic Bose systems with quantum Monte Carlo (QMC) methods.
On the other hand, the numerical study of Fermi systems is a still open problem of great relevance, as fermions constitute a substantial part of ordinary matter and methods for the accurate calculation of their ground-state and dynamical properties would be useful instruments for the interpretation of experimental data.
In this thesis, a number of approximate schemes for studying ground-state and dynamical properties of quantum many-body systems are presented and employed to calculate ground-state and dynamical properties of Bose and Fermi systems.
In particular, the Path Integral Ground State QMC method is used to investigate density fluctuations in one-dimensional systems of Helium atoms and hard rods, and the phaseless Auxiliary field QMC is used to investigate the electronic band
and effective mass of the two-dimensional homogeneous electron gas.
Tipologia IRIS:
Tesi di dottorato
Elenco autori:
M. Motta
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