Shinsei Ryu Univ. of Illinois, Urbana-Champaign Disentangling Topological Insulators by Tensor Networks Ali Mollabashi (IPM Tehran) Masahiro Nozaki (Kyoto) Tadashi Takayanagi (Kyoto) Collaborators: Based on arXiv:1208.3469, 1311.6095 and work in progress Xueda Wen (UIUC) Pedro Lopes (UIUC, Campinas) Gil Cho (UIUC) Thanks to: Yingfei Gu (Stanford), Xiaoliang Qi (Stanford)
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Disentangling Topological Insulators by Tensor Networks
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Shinsei RyuUniv. of Illinois, Urbana-Champaign
Disentangling Topological Insulators by Tensor Networks
Ali Mollabashi (IPM Tehran)
Masahiro Nozaki (Kyoto)
Tadashi Takayanagi (Kyoto)
Collaborators:
Based on arXiv:1208.3469, 1311.6095 and work in progress
Xueda Wen (UIUC)
Pedro Lopes (UIUC, Campinas)
Gil Cho (UIUC)
Thanks to: Yingfei Gu (Stanford), Xiaoliang Qi (Stanford)
Table of Contents
-- Tensor Network Methods for Quantum Manybody Problems
-- MERA and Emergent Metric
-- MERA for Topological States of Matter
-- Quantum Qunch and Finite-T
-- Summary
Tensor network:
way to avoid exponential complexity of many-body problems
Tensor network wave functions of various kinds:
MERA
(multiscale entanglement
renormalization ansatz)
PEPS (projected entangled pair state)
MPS (matrix product state) or DMRG
Tensor network approach to quantum manybody systems
Tensor network approach to quantum manybody systems
MPS (matrix product state) :
- Representing many-body wavefunctions by contracting many tensors
DMRG, MPS, MERA, PEPS, etc.
physical degrees of freedom
auxiliary index
Product state:
EE = 0
structure of tensor-network and entanglement entropy
Matrix product state (DMRG):
:dimension of the aux space ("bond dimension")
Area law scaling in 1D: quite generic in gapped quantum ground states.