Entanglement entropy of excited states

V Alba, M Fagotti, P Calabrese - Journal of Statistical Mechanics …, 2009 - iopscience.iop.org
We study the entanglement entropy of a block of contiguous spins in excited states of spin
chains. We consider the XY model in a transverse field and the XXZ Heisenberg spin chain …

Current operators in integrable spin chains: lessons from long range deformations

B Pozsgay - SciPost Physics, 2020 - scipost.org
We consider the finite volume mean values of current operators in integrable spin chains
with local interactions, and provide an alternative derivation of the exact result found recently …

Strong zero modes in integrable quantum circuits

E Vernier, HC Yeh, L Piroli, A Mitra - Physical Review Letters, 2024 - APS
It is a classic result that certain interacting integrable spin chains host robust edge modes
known as strong zero modes (SZMs). In this Letter, we extend this result to the Floquet …

Heisenberg XXX model with general boundaries: eigenvectors from algebraic Bethe ansatz

S Belliard, N Crampé - SIGMA. Symmetry, Integrability and Geometry …, 2013 - emis.de
We propose a generalization of the algebraic Bethe ansatz to obtain the eigenvectors of the
Heisenberg spin chain with general boundaries associated to the eigenvalues and the …

Antiperiodic spin-1/2 XXZ quantum chains by separation of variables: Complete spectrum and form factors

G Niccoli - Nuclear Physics B, 2013 - Elsevier
In this paper we consider the spin-1/2 highest weight representations for the 6-vertex Yang–
Baxter algebra on a finite lattice and analyze the integrable quantum models associated to …

[HTML][HTML] Non-analytic behavior of the Loschmidt echo in XXZ spin chains: Exact results

L Piroli, B Pozsgay, E Vernier - Nuclear Physics B, 2018 - Elsevier
We address the computation of the Loschmidt echo in interacting integrable spin chains after
a quantum quench. We focus on the massless regime of the XXZ spin-1/2 chain and present …

From the quantum transfer matrix to the quench action: the Loschmidt echo in XXZ Heisenberg spin chains

L Piroli, B Pozsgay, E Vernier - Journal of Statistical Mechanics …, 2017 - iopscience.iop.org
We consider the computation of the Loschmidt echo after quantum quenches in the
interacting XXZ Heisenberg spin chain both for real and imaginary times. We study two-site …

The half-infinite XXZ chain in Onsagerʼs approach

P Baseilhac, S Belliard - Nuclear Physics B, 2013 - Elsevier
The half-infinite XXZ open spin chain with general integrable boundary conditions is
considered within the recently developed 'Onsagerʼs approach'. Inspired by the finite size …

Non-diagonal open spin-1/2 XXZ quantum chains by separation of variables: complete spectrum and matrix elements of some quasi-local operators

G Niccoli - Journal of statistical mechanics: theory and …, 2012 - iopscience.iop.org
The integrable quantum models, associated with the transfer matrices of the 6-vertex
reflection algebra for spin-1/2 representations, are studied in this paper. In the framework of …

Construction of a coordinate Bethe ansatz for the asymmetric simple exclusion process with open boundaries

D Simon - Journal of Statistical Mechanics: Theory and …, 2009 - iopscience.iop.org
The asymmetric simple exclusion process with open boundaries, which is a very simple
model of out-of-equilibrium statistical physics, is known to be integrable. In particular, its …