Hierarchy of correlations for the Ising model in the Majorana representation

Abstract

We study the quantum Ising model in D dimensions with the equation of motion technique, in combination with the Majorana representation for spins. The decoupling scheme used for the Green's functions is based on the hierarchy of correlations in position space. To lowest order this method reproduces the well known mean field phase diagram and critical exponents. When correlations between spins are included, we show how the appearance of thermal fluctuations and magnons strongly affect the physical properties. We demonstrate that in 1D and for B=0, thermal fluctuations completely destroy the ordered phase, and that near the quantum critical point, the quantum model displays different behavior than its classical counterpart. We discuss the connection with the Dyson's equation formalism and the explicit form of the self-energies.

10 pages, 7 figures

References in corpus (7)

• Digitized adiabatic quantum computing with a superconducting circuit
• Phase diagram and critical exponents of a dissipative Ising spin chain in a transverse magnetic field
• Nonequilibrium Quantum Phase Transitions in the Ising Model
• Spin-spin correlators in Majorana representation
• The low-$T$ phase diagram of $\mathrm{LiH}{\mathrm{o}}_{\mathrm{x}}{\mathrm{Y}}_{1-\mathrm{x}}{\mathrm{F}}_4$
• Dynamical Quantum Phase Transitions in presence of a spin bath
• Hierarchy of correlations: Application to Green's functions and interacting topological phases

Cited by in corpus (2)

• Linear response theory for cavity QED materials at arbitrary light-matter coupling strengths
• Spin bath dynamics and dynamical Renormalization Group