2023/05/08 by Gabriel Gil, Augusto González, Gil, Gabriel +1
Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Quantum many-body systems #Spectroscopy and Quantum Chemical Studies #Statistical Mechanics (cond-mat.stat-mech) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.2305.05032
openalex publication_date 2023/05/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It is shown that a spin system is equivalent to a set of constrained harmonic oscillators. For finite, but large, systems, a continuous approximation to the density of states can be used, and the oscillator frequencies can be exactly computed. In the phase transition, the effective frequency of the lowest mode passes through zero, that is, it becomes an inverted oscillator. In the small oscillations regime, the oscillators can be treated as independent and the thermodynamic magnitudes can be computed. We show explicit calculations in a disordered, frustrated, high coordination number Blume Capel model with 60,000 spins.