Entanglement in composite free-fermion systems

Abstract

We consider fermionic chains where the two halves are either metals with different bandwidths or a metal and an insulator. Both are coupled together by a special bond. We study the ground-state entanglement entropy between the two pieces, its dependence on the parameters and its asymptotic form. We also discuss the features of the entanglement Hamiltonians in both subsystems and the evolution of the entanglement entropy after joining the two parts of the system.

arXiv comment20 pages, 13 figures, published version, minor corrections, references added

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Cited by in corpus (5)

• Inhomogeneous quenches in a fermionic chain: exact results
• Entanglement Hamiltonians for non-critical quantum chains
• Entanglement between random and clean quantum spin chains
• On the complex behaviour of the density in composite quantum systems
• Entanglement entropy in multi-leg Kitaev ladders with interface defects