Finite-size and Fluctuation Effects on Phase Transition and Critical Phenomena using Mean-Field Approach Based on Renormalized $\phi^{4}$ Model: I. Theory

TL;DR

This paper explores how finite-size and fluctuation effects influence phase transitions and critical phenomena near quantum critical points using a renormalized $$ model within a mean-field framework, emphasizing non-perturbative techniques.

Contribution

It introduces a non-perturbative mean-field approach based on a renormalized $$ model to analyze fluctuation and finite-size effects near quantum critical points.

Findings

Finite-size effects significantly alter critical behavior.

Harmonic and anharmonic fluctuations impact phase transition properties.

The approach provides qualitative insights into critical phenomena beyond classical mean-field theory.

Abstract

An investigation of the spatial fluctuations and their manifestations in the vicinity of the quantum critical point within the framework of the renormalized $\phi^{4}$ theory is proposed. Relevant features are reported through the Ginzburg-Landau-Wilson (GLW)-based calculations, combined with an efficient non perturbative technique. Both the dimension and size, but also microscopic details of the system, leading to critical behavior, and strongly deviating from the classical mean-field approach far from the thermodynamic limit, are taken into account. Further, the important role that harmonic and anharmonic fluctuations and finite-size effects can play in the determination of the characteristic properties of corresponding various systems, involving phase transitions and critical phenomena, is then discussed in detail with emphasis on the qualitative validity of the analysis