TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.12.6.199
TI  - On the logarithmic bipartite fidelity of the open XXZ spin chain at $Δ=-1/2$
PY  - 2022/06/24
UR  - https://www.scipost.org/SciPostPhys.12.6.199
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 12
IS  - 6
SP  - 199
A1  - Hagendorf, Christian
AU  - Parez, Gilles
AB  - The open XXZ spin chain with the anisotropy $\Delta=-\frac12$ and a one-parameter family of diagonal boundary fields is studied at finite length. A determinant formula for an overlap involving the spin chain's ground-state vectors for different lengths is found. The overlap allows one to obtain an exact finite-size formula for the ground state's logarithmic bipartite fidelity. The leading terms of its asymptotic series for large chain lengths are evaluated. Their expressions confirm the predictions of conformal field theory for the fidelity.
ER  -

@Article{10.21468/SciPostPhys.12.6.199,
	title={{On the logarithmic bipartite fidelity of the open XXZ spin chain at $Δ=-1/2$}},
	author={Christian Hagendorf and Gilles Parez},
	journal={SciPost Phys.},
	volume={12},
	pages={199},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.12.6.199},
	url={https://scipost.org/10.21468/SciPostPhys.12.6.199},
}