On the relation of the entanglement spectrum to the bulk polarization

Abstract

The bulk polarization is a ${\mathbb{Z}}_2$ topological invariant characterizing non-interacting systems in one dimension with chiral or particle-hole symmetries. We show that the bulk polarization can always be determined from the single-particle entanglement spectrum, even in the absence of symmetries that quantize it. In the symmetric case, the known relation between the bulk polarization and the number of virtual topological edge modes is recovered. We use the bulk polarization to compute Chern numbers in 1D and 2D, which illuminates their known relation to the entanglement spectrum. Furthermore we discuss an alternative bulk polarization that can carry more information about the surface spectrum than the conventional one and can simplify the calculation of Chern numbers.

15 pages, 9 figures

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Cited by in corpus (6)

• Polarization and entanglement spectrum in non-hermitian systems
• Quantization of topological indices in critical chains at low temperatures
• Thermodynamics and entanglement entropy of the non-Hermitian SSH model
• Entanglement and particle fluctuations of one-dimensional chiral topological insulators
• Unified Bulk-Entanglement Correspondence in Non-Hermitian Systems
• From Hermitian critical to non-Hermitian point-gapped phases