Thermal coupled cluster theory for SU(2) systems
arXiv:2107.07922 · doi:10.1103/PhysRevB.105.045125
Abstract
Coupled cluster (CC) has established itself as a powerful theory to study correlated quantum many-body systems. Finite-temperature generalizations of CC theory have attracted considerable interest and have been shown to work as nicely as the ground-state theory. However, most of these recent developments address only fermionic or bosonic systems. The distinct structure of the algebra requires the development of a similar thermal CC theory for spin degrees of freedom. In this paper, we provide a formulation of our thermofield-inspired thermal CC for SU(2) systems. We apply the thermal CC to the Lipkin-Meshkov-Glick system as well as the one-dimensional transverse field Ising model as benchmark applications to highlight the accuracy of thermal CC in the study of finite-temperature phase diagrams in SU(2) systems.
14 pages, 6 figures
References in corpus (12)
- Matrix Product Density Operators: Simulation of finite-T and dissipative systems
- Minimally Entangled Typical Thermal State Algorithms
- Quasiparticle Coupled Cluster Theory for Pairing Interactions
- Hierarchical mean-field approach to the - Heisenberg model on a square lattice
- Variational tensor network renormalization in imaginary time: benchmark results in the Hubbard model at finite temperature
- Frustrated Quantum Spins at finite Temperature: Pseudo-Majorana functional RG approach
- Merging symmetry projection methods with coupled cluster theory: Lessons from the Lipkin model Hamiltonian
- Cluster Density Matrix Embedding Theory for Quantum Spin Systems
- Exploring non-linear correlators on AGP
- Finite-Temperature Auxiliary-Field Quantum Monte Carlo for Bose-Fermi Mixtures
- Finite Temperature Auxiliary Field Quantum Monte Carlo in the Canonical Ensemble
- Frustrated spin- Heisenberg magnet on a square-lattice bilayer: High-order study of the quantum critical behavior of the ---- model