Exact results for the entanglement across defects in critical chains

Abstract

We consider fermionic and bosonic quantum chains where a defect separates two subsystems and compare the corresponding entanglement spectra. With these, we calculate their Rényi entanglement entropies and obtain analytical formulae for the continuously varying coefficient of the leading logarithmic term. For the bosonic case we also present numerical results.

17 pages, 6 figures, some remarks added

References in corpus (3)

• The entanglement entropy of one-dimensional gases
• Solution of the fermionic entanglement problem with interface defects
• Entanglement Entropy of Quantum Wire Junctions

Cited by in corpus (42)

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• Rényi entropy and negativity for massless complex boson at conformal interfaces and junctions
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• Entanglement of Free Fermions and Bosons at Finite Temperature
• Defect conformal field theory from Sachdev-Ye-Kitaev interactions
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