2008/06/23 by Zheng‐Cheng Gu, Zheng-Cheng Gu, Michael Levin +1 · 16 citations
Mathematics · Physics and Astronomy · #Density matrix renormalization group #Mathematics #Physics #Physics of Superconductivity and Magnetism #Pure mathematics #Quantum #Quantum and electron transport phenomena #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Renormalization group #Spontaneous symmetry breaking #Symmetry breaking #Symmetry protected topological order #Tensor (intrinsic definition) #Tensor product #Theoretical physics #Topological order #Topology (electrical circuits) #cond-mat.dis-nn #cond-mat.stat-mech #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevb.78.205116
published as Phys. Rev. B 78, 205116 (2008) · 4 pages, RevTeX4
arxiv created 2008/06/23 · openalex publication_date 2008/11/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Traditional mean-field theory is a generic variational approach for analyzing symmetry breaking phases. However, this simple approach only applies to symmetry breaking states with short-range entanglement. In this paper, we describe a generic approach for studying two-dimensional (2D) quantum phases with long-range entanglement (such as topological phases). The method is based on (a) a general class of trial wave functions known as tensor-product states and (b) a 2D real-space renormalization group algorithm for efficiently calculating expectation values for these states. We demonstrate our method by studying several simple 2D quantum spin models exhibiting both symmetry breaking phase transitions and topological phase transitions. Our approach can be viewed as a unified mean-field theory for both symmetry breaking phases and topological phases.