Work

Quantum Phase Transition in the Spin-Boson Model: A Multilayer Multiconfiguration Time-Dependent Hartree Study

Year: 2019

Type: article

Abstract: The multilayer improved relaxation is applied to study the delocalization-localization transition in the spin-boson model at zero temperature-a well-known example of quantum phase transition. Calculations of energy eigenstates are obtained by iteratively diagonalizing the matrix of the Boltzmann operator in the top layer representation, using a Lanczos/Arnoldi method while relaxing the single particle functions of all layers using the multilayer multiconfiguration time-dependent Hartree imaginary time propagation. Two properties are used to examine the quantum phase transition: the energy splitting for the lowest pair of eigenstates and the magnetic susceptibility. Consistent findings are obtained with appropriate scaling parameters.

Source: The Journal of Physical Chemistry A

DOI: 10.1021/acs.jpca.8b11136

Authors: Haobin Wang, Jiushu Shao

Institutions: Beijing Computational Science Research Center, University of Colorado Denver, Beijing Normal University

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, National Natural Science Foundation of China, Division of Chemistry

Awards: G4501007227, Developing the multilayer multiconfiguration time-dependent Hartree theory, G8143183469